OB2273 guide
MKS 产品选择指南说明书
Downstream Pressure Controllers and ValvesPRODUCT SELECTION GUIDE651, 1651, 153, 253, 653, aND hEaTED VaLVESIsolating and close-loop controlling each variable that affects a vacuum process is the best method for achieving process consistency. At MKS, we can isolate and close-loop control process pressure using a throttling control valve and a digital PID or self-tuning pressure controller. A typical pressure control system works as follows: (1) a Baratron ® capacitance manometer senses pressure in a vacuum chamber; (2) this pressure is then compared to the desired set point pressure in the pressure controller; and (3) the pressure controller commands the control valve to open or close, changing the chamber pressure and bringing it to the desired process pressure set point.No one pressure control technique is best for all applications, though the downstream control technique is chosen most often for today’s more critical vacuum processes (see chart below). With the downstream control technique, an exhaust throttle valve is opened or closed, changing the conductance to the vacuum pump in order to achieve and maintain the desired process pressure—independent of gas inlet. The downstream pressure control technique provides high dynamic range, works well with all types of vacuum pumps, provides fast response, is tolerant to most effluent gases, and has moderate initial costs.Pressure Control T echniquesValveW W W .M K S I N S T .C OM1651The 1651 is a display-less version of the 651 for OEMdesign engineers who wish to completely control theirprocess via a host computer. Offered as an economicalalternative to the 651, this “black box” version allowsfor remote setup or control entirely through rear panelinterface—RS-232, TTL, or analog. Its compact size allowsfor installation anywhere on the process system, savingvaluable rack space.651The 651 Self-tuning/Digital PID Valve Controller drives653 or 253 Exhaust Throttle Valves with speed andprecision. Its self-tuning algorithm brings the system toset point faster than conventional controllers, and ensuresrepeatable process recipes without operator involvement.The self-tuning function determines optimal controlparameters for any set point in the range of the valve bylearning time constants, transfer functions of the valve andplumbing, valve gain, and other important parameters.The 651 includes adjustable soft-start functions for eachset point, as well as open and close functions to minimizeturbulence in the chamber; local/remote transducerzeroing capability; and two relays to activate other systemfunctions, or to indicate if the pressure deviates fromthe desired set point. All controls are easily accessedvia a simple-to-use front panel, or remotely through RS-232, TTL, or analog voltage. An LCD readout showsvalve position and displays pressure in a wide range ofengineering units. Five reprogrammable set points areprovided for pressure or position control.Self-T uning/Digital PIDPressure ControllersPressure Controllers andExhaust Throttle Valves“Smart” Exhaust Throttle Valve253The 253 Exhaust Throttle Valve regulates the removal of gas from a processing system. Its flapper is positioned to modulate gas flow, thereby controlling process pressure. The 253 has a non-linear actuator placed between the flapper shaft and the motor drive shaft in order to generate a linear valve transfer characteristic and provide smooth linear pressure control. The 253 is available in standard sizes and flange styles, and is compatible with all MKS throttle valve controllers.Exhaust Throttle Valve153Specifically designed for computer-controlled applications where a simple pressure control system is desired, the 153 Valve integrates all control, communication, and driver circuits via a compact “add-on” electronics module within a 253 Throttle Valve assembly, eliminating the need for a separate pressure control electronics module. The 153 is operable in two modes, flapper positioning or pressure control.For DeviceNet ™ communications consult Applications Engineering on the 683.653The 653 high-speed motor and gear/driver assembly provides fast response to a given set point to quicklyachieve desired pressure and increase system throughput. High accuracy is attained by micro-stepping the flapper to give more precise control, and no drift, of pressure at the desired set point. The 653 has sufficient torque to operate sealing valves up to four inches and non-sealing valves to 12 inches to prevent clogging from contamination buildup. The valve body can be heated up to 150°C (using optional sealing materials) for operation in high temperature applications and processes. The 653 has a flapper position indicator to identify valve angle during systemtroubleshooting, is available in a variety of sizes and flangestyles, and is compatible with 651 and 1651 Controllers.Exhaust Throttle Valve withHigh-speed Motor/Gear AssemblyIPS SubsystemCurrent trends in semiconductor processing are towards less maintenance, more uptime, and increased product yield. Reduction of the solid buildup resulting from thecooling of effluent gases can be a factor in achieving those goals. Heating the valve and other components of the system is part of a method to manage these byproducts, increasing uptime, and improving wafer yields, with a quick payback.IPS offers subsystems to improve heat distribution on downstream lines while complying with strict agency andcorporate personnel safety standards.HeatersDownstream Pressure Controllers Pressure ControllerSpecifications651C 1651CValves Operated 653 and 253 Exhaust 653 and 253 ExhaustThrottle ValvesThrottle ValvesPressure Input Signal 0-10 VDC, 0-5 VDC, or 0-1 VDC, 0-5 VDC, 0-10 VDC, 0-1 VDC,selectableselectable Input Power Required 90-132 or 180-264 VAC, 50/60 Hz ±15 VDC ±5% Minimum Input CurrentFor 653 Valve: 1 Amp +transducercurrentFor 253 Valve: 0.5 Amp + transducer current Maximum Input CurrentNot to exceed 7 AmpsSet PointsProgrammable 5 total, programmable in any5 total, programmable in anycombination for pressure or combination for pressure or position (adjustable from the position (adjustable via RS-232;front panel or RS-232; selectable selectable via TTL or RS-232)from the front panel, TTL,or RS-232)External analog 1; pressure or position, 1; pressure or position,0-5 or 0-10 VDC0-5 or 0-10 VDC Controller Repeatability±0.1% of F .S.±0.1% of F .S.ambient Operating Temperature 15°-40°C (60°-104°F)15°-50°C (60°-122°F)Output PowerStandard:±15VDC±********Available to external transducers: (Derated to 0.4 Amp with 90-99±15 Volts @ 3 Amps max. (90 Watts) or 180-198 VAC input) when powered from an external power supply withOptional: ±15 VDC ±5% @ 1.5a capacity of ±15 Volts @ 5 Amps (150Ampsmax. Watts)analog Output Signal0-5 or 0-10 VDC for 0-100% 0-5 or 0-10 VDC for 0-100%valve position and 0-10 VDC valve position and 0-10 VDCfor 0-100% F .S. pressure for 0-100% F .S. pressure Size1/2-rack packaging: 3 1/2” H x 6.7”W x 9.15”D3-1/2”H x 9-1/2”W x 9”DDisplay2-line LCD with 4-1/2 place readout N/A(pressure and valve position)Display Units T orr, mT orr, mbar, Pascal, N/A cmH 2O, inH 2O, µbar, kPaSoft StartStandard Standard Self-tuning Unit Standard Standard PID Control Standard Standard Remote Zero Standard StandardInterface Front panel, Analog, TTLAnalog, TTL (16 inputs, 6 outputs)(16 inputs, 6 outputs) and RS-232 and RS-232Relay Outputs 2, process limits: 24 Volts AC/DC 2, process limits: 24 Volts VDC @@ 1 Amp resistive1 Amp resistive Remote Control Override Standard Standard (Open, Close, hold)Position Control Capability Standard StandardConnectors Valve: 9-pin Type “D” female Power Connector: 9-pin Type “D” male I/O: 37-pin Type “D” femaleValve: 9-pin Type “D” female Transducer: 15-pin Type “D” female I/O: 37-pin Type “D” female RS-232: 9-pin Type “D” male Transducer: 15-pin Type “D” femaleRS-232: 9-pin Type “D” male ComplianceCECE653B 253B Speed (open to close) 1.7 sec Standard: 7.5 sec. Optional: <2 sec. (Note 1)Resolution1/12,000 Standard: 1/10,000Fast Motor Option: 1/2800Drive MethodDirect gear drive Mechanical (non belt) drive with integral cosinegenerator to linearize valve transfer characteristic Maximum Valve Body Standard: 0°C-100°C 0°-90°C Operating Temperature Optional: 0°C-150°C (Note 1)Valve Motor ambient -20°C to +40°C 0°C-70°C max. Operating Temperature Differential Pressure 1 atm. (15 psig) max. 1 atm. (15 psig) across Valve External Leakage at 1x10-8 scc/sec He1x10-7 scc/sec He Shaft SealMaterials Exposed Standard: 316L S.S., Viton ® (Note 2) 316 S.S., Viton (Note 2) to ProcessCompatible Controller651, 1651651, 1651, 153Visual Position Indicator Standard N/ADrive Output Torque 800 in-oz Standard speed: 600 in-oz (with 651 Controller)High-speed: 170 in-oz Closed Leakage <10-7 (T orr l/s) <10-7 (Torr l/s)(valves with a flapper o-ring) Notes:1) Consistent with shaft seal and flapper seal o-ring material.2) Where Viton is used, other materials are available.Contact Applications Engineering.Throttle Valve Specifications (Common to All Sizes & Flanges)Notes:1) Fast Motor Option only available onnon-sealing valves.2) Where Viton is used, other materials are available. Contact Applications Engineering.Dimensional Drawings Exhaust Throttle Valve Sizes and Flange Styles ASA Flanges253B(a) (B) (C) (D) (E)(**)Nominal NumberFlangeFlange Controllable PartMounting Inside Outside Bolt hole of Bolt Overall Bolt Circle O-ring Flapper O-ring Conductance l/s Number Flange Diameter Diameter Thickness Diameter holes height* Diameter Groove ID O-ring Parker No. min (max)253B-2-2-1 2” ASA 1.88 (48) 5.95 (151) 0.75 (19) 0.75 (19) 4 10.79 (274) 4.750 (121) 3.365 (85) Y es 2-237 0.35 300253B-2-2-2 2” ASA 1.95 (50) 5.95 (151) 0.75 (19) 0.75 (19) 4 10.79 (274) 4.750 (121) 3.365 (85) No 2-237 0.7 300253B-60-2-2 2” ASA 2.362 (60) 5.95 (151) 0.75 (19) 0.75 (19) 4 10.79 (274) 4.750 (121) 3.365 (85) No 2-237 0.8 375253B-3-2-2 2” ASA 3.025 (77) 5.95 (151) 0.75 (19) 0.75 (19) 4 10.79 (274) 4.750 (121) 3.365 (85) No 2-237 1 500253B-3-3-2 3” ASA 3.025 (77)7.40 (188)0.88 (22) 0.75 (19) 4 12.24 (311) 6.000 (152) 4.475 (114) No 2-349 1 500253B-3-3-2 3” ASA 3.965 (101) 7.40 (188) 0.88 (22) 0.75 (19) 4 12.24 (311) 6.000 (152) 4.475 (114) No 2-349 1.5 950253B-4-4-24” ASA3.965 (101) 8.90 (226)0.88 (22)0.75 (19)813.74 (349) 7.500 (191) 5.995 (152)No2-258 1.5 950*For 153 Valves, add 1.93” (49mm) to the 253 Dimension** Molecular flow regime653B(a) (B) (C) (D) (E) (**)Nominal Number FlangeFlange Controllable Part Mounting Inside Outside Bolt hole of Bolt Overall Bolt Circle O-ring Flapper O-ring Conductance l/s Number Flange Diameter Diameter Thickness Diameter holes height Diameter Groove ID O-ring Parker No. min (max)653B-2-2-1 2” ASA 1.886 (48) 5.95 (151) 1.00 (25) 0.75 (19) 4 12.53 (318) 4.750 (121) 3.365 (85) Y es 2-237 0.35 300653B-2-2-2 2” ASA 1.886 (48) 5.95 (151) 1.00 (25) 0.75 (19) 4 12.53 (318) 4.750 (121) 3.365 (85) No 2-237 0.7 300653B-60-2-1 2” ASA 2.360 (60) 5.95 (151) 1.00 (25) 0.75 (19) 4 12.53 (318) 4.750 (121) 3.365 (85) Y es 2-237 0.4 375653B-60-2-1 2” ASA 2.360 (60) 5.95 (151) 1.00 (25) 0.75 (19) 4 12.53 (318) 4.750 (121) 3.365 (85) Nos 2-237 0.8 375653B-3-2-1 2” ASA 2.886 (73) 5.95 (151) 1.00 (25) 0.75 (19) 4 12.53 (318) 4.750 (121) 3.365 (85) Y es 2-237 0.5 500653B-3-2-2 2” ASA 2.886 (73) 5.95 (151) 1.00 (25) 0.75 (19) 4 12.53 (318) 4.750 (121) 3.365 (85) No 2-237 1 500653B-3-3-1 3” ASA 2.886 (73) 7.40 (188) 1.00 (25) 0.75 (19) 4 14.02 (356) 6.000 (152) 4.475 (114) Y es 2-349 0.75 500653B-3-3-2 3” ASA 2.886 (73) 7.40 (188) 1.00 (25) 0.75 (19) 4 14.02 (356) 6.000 (152) 4.475 (114) No 2-349 1 500653B-4-3-1 3” ASA 3.885 (99) 7.40 (188) 1.00 (25) 0.75 (19) 4 14.02 (356) 6.000 (152) 4.475 (114) Y es 2-349 0.75 950653B-4-3-2 3” ASA 3.885 (99) 7.40 (188) 1.00 (25) 0.75 (19) 4 14.02 (356) 6.000 (152) 4.475 (114) No 2-349 1.5 950653B-4-4-1 4” ASA 3.885 (99) 8.90 (226) 1.00 (25) 0.75 (19) 8 15.54 (395) 7.500 (191) 5.995 (152) Y es 2-258 0.75 950653B-4-4-2 4” ASA 3.885 (99)8.90 (226)1.00 (25) 0.75 (19) 8 15.54 (395) 7.500 (191) 5.995 (152) No 2-258 1.5 950653B-6-4-1 4” ASA 5.503 (140) 8.90 (226)1.62 (41)0.75 (19) 8 16.16 (410) 7.500 (191) 5.995 (152) No 2-258 4 2150653B-6-6-2 6” ASA 5.869 (149) 10.90 (277) 1.62 (41) 0.88 (22) 8 18.18 (462) 9.500 (241) 8.000 (203) No 2-266 4 2150653B-8-6-2 6” ASA 7.636 (194) 10.90 (277) 1.62 (41) 0.88 (22) 8 18.18 (462) 9.500 (241) 8.000 (203) No 2-266 6 3600653B-8-8-28” ASA7.636 (194) 13.19 (335) 1.62 (41) 0.88 (22) 8 20.48 (520 11.750 (298) 9.750 (248)No2-273 8 3600653B-10-10-2 10” ASA 10.118 (257) 16.00 (406) 1.62 (41)1.00 (25)1223.31 (592)14.250 (362) 11.938 (362) No2-278106400Dimensions in inches (mm)** Molecular flow regimeCF Flanges253B(a) (B) (C) (D) (E) (**)Nominal Number ControllablePart Mounting Inside Outside Bolt hole of Bolt Overall Bolt Circle Flapper Conductance l/sheight*DiameterO-ringholesmin (max)DiameterDiameterNumber FlangeThicknessDiameter253B-20-2CF-1 2 3/4” CF 0.779 (20) 2.75 (70) 1.25 (32) 0.26 (6.6) 6 8.64 (220) 2.312 (59) Y es 0.07 24 253B-20-2CF-2 2 3/4” CF 0.779 (20) 2.75 (70) 1.25 (32) 0.26 (6.6) 6 8.64 (220) 2.312 (59) No 0.25 31 253B-1-2CF-1 2 3/4” CF 1.270 (32) 2.75 (70) 1.25 (32) 0.26 (6.6) 6 8.64 (220) 2.312 (59) Y es 0.2 50 253B-1-2CF-2 2 3/4” CF 1.270 (32) 2.75 (70) 1.25 (32) 0.26 (6.6) 6 8.64 (220) 2.312 (59) No 0.4 55 253B-2-3CF-1 3 3/8” CF 1.889 (48) 3.25 (83) 1.06 (27) 0.33 (8.3) 8 9.14 (232) 2.850 (72) Y es 0.35 300 253B-2-3CF-2 3 3/8” CF 2.000 (51) 3.25 (83) 1.06 (27) 0.33 (8.3) 8 9.14 (232) 2.850 (72) No 0.7 300 253B-2-4CF-2 4 1/2” CF 2.000 (51) 4.47 (114) 1.00 (25) 0.33 (8.3) 8 10.36 (263) 3.628 (92) No 0.7 300 253B-3-6CF-26” CF 3.000 (76) 7.40 (188) 0.81 (21) 0.33 (8.3) 16 12.24 (311) 5.128 (130) No 1 500 253B-4-6CF-26” CF 3.875 (98) 7.40 (188) 0.94 (24) 0.33 (8.3) 16 12.24 (311) 5.128 (130) No 1.5 900 *For 153 Valves, add 1.93” (49mm) to the 253 Dimension** Molecular flow regime653B(a) (B) (C) (D) (E) (**)Nominal Number ControllablePart Mounting Inside Outside Bolt hole of Bolt Overall Bolt Circle Flapper Conductance l/s Number FlangeDiameterO-ringmin (max)holesheightDiameterDiameterDiameterThickness653B-20-2CF-1 2 3/4” CF 0.779 (20) 2.75 (70) 1.00 (25) 0.27 (6.8) 6 10.55 (268) 2.312 (59) Y es 0.07 24 653B-20-2CF-2 2 3/4” CF 0.779 (20) 2.75 (70) 1.00 (25) 0.27 (6.8) 6 10.55 (268) 2.312 (59) No 0.25 31 653B-1-2CF-1 2 3/4” CF 1.270 (32) 2.75 (70) 1.00 (25) 0.27 (6.8) 6 10.55 (268) 2.312 (59) Y es 0.2 50 653B-1-2CF-2 2 3/4” CF 1.270 (32) 2.75 (70) 1.00 (25) 0.27 (6.8) 6 10.55 (268) 2.312 (59) No 0.4 55 653B-2-3CF-1 3 3/8” CF 1.886 (48) 3.25 (83) 1.00 (25) 0.34 (8.6) 8 11.05 (281) 2.850 (72) Y es 0.35 300 653B-2-3CF-2 3 3/8” CF 1.886 (48) 3.25 (83) 1.00 (25) 0.34 (8.6) 8 11.05 (281) 2.850 (72) No 0.7 300 653B-2-4CF-1 4 1/2” CF 1.886 (48) 4.47 (114) 1.00 (25) 0.34 (8.6) 8 12.28 (312) 3.628 (92) Y es 0.35 300 653B-2-4CF-2 4 1/2” CF 1.886 (48) 4.47 (114) 1.00 (25) 0.34 (8.6) 8 12.28 (312) 3.628 (92) No 0.7 300 653B-3-6CF-16” CF 2.886 (73) 7.40 (188) 1.00 (25) 0.33 (84) 16 14.07 (357) 5.128 (130) Y es 0.5 500 653B-3-6CF-26” CF 2.886 (73) 7.40 (188) 1.00 (25) 0.33 (84) 16 14.07 (357) 5.128 (130) No 1 500 653B-4-6CF-16” CF 3.885 (99) 7.40 (188) 1.00 (25) 0.33 (84) 16 14.07 (357) 5.128 (130) Y es 0.75 900 653B-4-6CF-26” CF 3.885 (99) 7.40 (188) 1.00 (25) 0.33 (84) 16 14.07 (357) 5.128 (130) No 1.5 900 653B-6-8CF-28” CF 5.869 (149) 8.90 (226) 1.62 (41) 0.33 (.84) 20 17.13 (435) 7.128 (181) No 2 2100 653B-8-10CF-210” CF 7.650 (194) 11.22 (285) 1.62 (41) 0.33 (8.4) 24 18.90 (480) 9.128 (232) No 3 3750 Dimensions in inches (mm)** Molecular flow regimeDownstream Pressure Controllers Exhaust Throttle Valve Sizesand Flange Styles ISO Flanges253B(a)(B) (C) (D) (E)(**) Nominal Number Controllable PartMounting InsideOutside Bolt hole of Bolt Overall Bolt Circle Flapper Conductance l/s Number Flange Diameter Diameter Thickness Diameter holes height* Diameter O-ring min (max)253B-20-40-1 ISO KF-40 0.779 (20) 2.75 (70) 2.25 (57) N/A N/A 8.64 (219) N/A Y es 0.07 24253B-20-40-2 ISO KF-40 0.779 (20) 2.75 (70) 2.25 (57) N/A N/A 8.64 (219) N/A No 0.25 31253B-1-40-1 ISO KF-40 1.270 (32) 2.75 (70) 2.25 (57) N/A N/A 8.64 (219) N/A Y es 0.2 50253B-1-40-2 ISO KF-40 1.770 (32) 2.75 (70) 2.25 (57) N/A N/A 8.64 (219) N/A No 0.4 55235B-2-50-1 ISO KF-50 1.888 (48) 3.25 (83) 2.00 (51) N/A N/A 9.14 (232) N/A Y es 0.35 300235B-2-50-2 ISO KF-50 2.000 (51) 3.25 (83) 2.00 (51) N/A N/A 9.14 (232) N/A No 0.7 300253B-60-63-2 ISO NW-63 2.362 (60) 5.95 (151) 0.81 (21) 0.35 (9) 4 10.79 (274) 4.330 (110) No 0.8 375253B-3-80-2 ISO NW-80 3.000 (76) 5.95 (151) 0.81 (21) 0.35 (9) 8 10.79 (274) 4.920 (125) No 1 500253B-4-100-2ISO NW-1003.875 (98)7.40 (188)0.94 (24) 0.35 (9) 8 12.24 (311) 5.710 (145) No 1.5 900*For 153 Valves, add 1.93” (49mm) to the 253 Dimension** Molecular flow regime653B(a) (B) (C) (D) (E)(**) Nominal Number Controllable Part Mounting Inside Outside Bolt hole of Bolt Overall Bolt Circle Flapper Conductance l/s Number Flange Diameter Diameter Thickness Diameter holes height Diameter O-ring min (max)653B-20-40-1 ISO KF-40 0.779 (20) 2.75 (70) 2.25 (57) N/A N/A 10.58 (268) N/A Y es 0.07 24 653B-20-40-2 ISO KF-40 0.779 (20) 2.75 (70) 2.25 (57) N/A N/A 10.58 (268) N/A No 0.25 31 653B-1-40-1 ISO KF-40 1.270 (32) 2.75 (70) 2.25 (57) N/A N/A 10.58 (268) N/A Y es 0.2 50653B-1-40-2 ISO KF-40 1.270 (32) 2.75 (70) 2.25 (57) N/A N/A 10.58 (268) N/A No 0.4 55 653B-2-50-1 ISO KF-50 1.886 (48) 3.25 (83) 2.00 (51) N/A N/A 11.06 (281) N/A Y es 0.35 300653B-2-50-2 ISO KF-50 1.886 (48) 3.25 (83) 2.00 (51) N/A N/A 11.06 (281) N/A No 0.7 300653B-60-63-1 ISO NW-63 2.360 (60) 5.95 (151) 1.00 (25) 0.35 (9) 4 12.53 (318) 4.330 (110) Y es 0.4 375653B-60-63-2 ISO NW-63 2.360 (60) 5.95 (151) 1.00 (25) 0.35 (9) 4 12.53 (318) 4.330 (110) No 0.8 375653B-3-80-1 ISO NW-80 2.886 (74) 5.95 (151) 1.00 (25) 0.35 (9) 8 12.53 (318) 4.920 (125) Y es 0.5 500653B-3-80-2 ISO NW-80 2.886 (74) 5.95 (151) 1.00 (25) 0.35 (9) 8 12.53 (318) 4.920 (125) No 1 500653B-4-100-1 ISO NW-100 3.885 (99) 7.40 (1.88) 1.00 (25) 0.35 (9) 8 14.02 (356) 5.710 (145) Y es 0.75 950653B-4-100-2 ISO NW-100 3.885 (99) 7.40 (1.88) 1.00 (25) 0.35 (9) 8 14.02 (356) 5.710 (145) No 1.5 900653B-6-160-2 ISO NW-160 5.869 (149) 8.90 (226) 1.62 (41) 0.43 (11) 8 16.16 (410) 7.870 (200) No 4 2100653B-8-200-2 ISO NW-200 7.650 (194) 11.22 (285) 1.62 (41) 0.43 (11) 12 18.50 (470) 10.240 (260) No 6 3750653B-10-250-2 ISO NW-250 9.700 (246)13.19 (335)1.62 (41) 0.43 (11) 12 20.48 (520) 12.200 (310) No 8 6000653B-12-320-2ISO NW-32012.370 (314) 16.73 (425) 1.62 (41) 0.55 (14) 12 24.02 (610) 15.55 (395) No 10 9300Dimensions in inches (mm)** Molecular flow regimeJIS Flanges253B(**)Flange Controllable Nominal Number FlangePart Mounting Inside Outside Bolt hole of Bolt Overall Bolt Circle O-ring O-ring Flapper Conductance l/s Number Flange Diameter Diameter Thickness Diameter holes height* Diameter Groove ID Size (JIS) O-ring min (max)253B-2-50J-1JIS 50mm 1.888 (48) 4.47 (114) 1.00 (25) 0.39 (10) 4 10.36 (263) 3.937 (100) 2.766 (70) 2.765 x 0.157 Y es 0.35 300(4)x(70)253B-2-50J-2JIS 50mm 2.000 (51) 4.47 (114) 1.00 (25) 0.39 (10) 4 10.36 (263) 3.937 (100) 2.766 (70) 2.765 x 0.157 No 0.35 300(4)x(70)253B-4-100J-2JIS 50mm 3.875 (98) 7.40 (188) 0.94 (24) 0.47 (12) 8 13.29 (338) 6.299 (160) 4.724 (120) 4.724 x 0.157 No 0.35 300(4)x(120)*For 153 Valves, add 1.93” (49mm) to the 253 Dimension** Molecular flow regime653BNominal Number Flange Flange Controllable (**)Part Mounting Inside Outside Bolt hole of Bolt Overall Bolt Circle O-ring O-ring Flapper Conductance l/s Number Flange Diameter Diameter Thickness Diameter holes height Diameter Groove ID Size (JIS) O-ring min (max)653B-2-50J-1JIS 50mm 1.886 (48) 4.47 (114) 1.00 (25) 0.39 (10) 4 12.27 (312) 3.937 (100) 2.766 (70) 2.756 x 0.157 Y es 0.35 300(4)x(70)653B-2-50J-2JIS 50mm 1.886 (48) 4.47 (114) 1.00 (25) 0.39 (10) 4 12.27 (312) 3.937 (100) 2.766 (70) 2.756 x 0.157 No 0.7 300(4)(70)x653B-4-100J-1JIS 100mm 3.8865 (99) 7.28 (185) 1.00 (25) 0.47 (12) 8 13.90 (353) 6.299 (160) 4.724 (120) 4.724 x 0.157 Y es 0.75 950(4)x(120)653B-4-100J-2JIS 100mm 3.8865 (99) 7.28 (185) 1.00 (25) 0.47 (12) 8 13.90 (353) 6.299 (160) 4.724 (120) 4.724 x 0.157 No 1.5 900(4)x(120)653B-6-150J-2JIS 150mm 5.709 (145) 9.25 (235) 1.62 (41) 0.47 (12) 8 16.51 (419) 8.268 (210) 6.890 (175) 6.890 x 0.157 No 2 2100(4)x(173)653B-8-200J-2JIS 200mm 7.677 (195) 11.81 (300) 1.62 (41) 0.59 (15) 8 19.09 (485) 10.630 (270) 8.858 (225) 8.761 x 0.236 No 3 3600(6)(223)x653B-10-250J-2JIS 250mm 9.645 (245) 13.78 (350) 1.62 (41) 0.59 (15) 12 21.08 (535) 12.598 (320) 10.827 (275) 10.709 x 0.236 No 4 6000(6)x(272)653B-12-300J-2JIS 300mm 11.597 (295) 15.75 (400) 1.62 (41) 0.59 (15) 12 23.02 (585) 14.566 (370) 12.795 (325) 12.795 x 0.236 No 5 8600(6)(322)xDimensions in inches (mm)** Molecular flow regimeThrottle Valve Heater KitsNW40Voltage Temp. LTa Watts amps Kit# (253 & 653) 120 VAC 150°C No 59 0.49 55-0361120 VAC 150°C Y es 59 0.49 55-0362120 VAC 105°C No 59 0.49 55-0363120 VAC 105°C Y es 59 0.49 55-0364240 VAC 150°C No 59 0.25 55-0367240 VAC 150°C Y es 59 0.25 55-0368240 VAC 105°C No 59 0.25 55-0369240 VAC 105°C Y es 59 0.25 55-0370NW50Voltage Temp. LTa Watts amps Kit# (253 & 653) 120 VAC 150°C No 68 0.57 55-0371120 VAC 150°C Y es 68 0.57 55-0372120 VAC 105°C No 68 0.57 55-0373120 VAC 105°C Y es 68 0.57 55-0374240 VAC 150°C No 68 0.28 55-0377240 VAC 150°C Y es 68 0.28 55-0378240 VAC 105°C No 68 0.28 55-0379240 VAC 105°C Y es 68 0.28 55-0380 NW80*Voltage Temp. LTa Watts amps Kit# 253 Kit# 653 120 VAC 150°C No 104 0.87 55-0172 55-0176 120 VAC 150°C Y es 104 0.87 55-0173 55-0177 120 VAC 105°C No 104 0.87 55-0170 55-0174 120 VAC 105°C Y es 104 0.87 55-0171 55-0175240 VAC 150°C No 104 0.43 55-0221 55-0225 240 VAC 150°C Y es 104 0.43 55-0222 55-0226 240 VAC 105°C No 104 0.43 55-0223 55-0227 240 VAC 105°C Y es 104 0.43 55-0224 55-0228NW100**Voltage Temp. LTa Watts amps Kit# 253 Kit# 653 120 VAC 150°C No 123 1.02 55-0251 55-0255 120 VAC 150°C Y es 123 1.02 55-0252 55-0256 120 VAC 105°C No 123 1.02 55-0253 55-0257 120 VAC 105°C Y es 123 1.02 55-0254 55-0258240 VAC 150°C No 123 0.51 55-0261 55-0265 240 VAC 150°C Y es 123 0.51 55-0262 55-0266 240 VAC 105°C No 123 0.51 55-0263 55-0267 240 VAC 105°C Y es 123 0.51 55-0264 55-0268NW63Voltage Temp. LTa Watts amps Kit# 253 Kit# 653 120 VAC 150°C No 104 0.87 55-0721 55-0731 120 VAC 150°C Y es 104 0.87 55-0722 55-0732 120 VAC 105°C No 104 0.87 55-0723 55-0733 120 VAC 105°C Y es 104 0.87 55-0724 55-0734240 VAC 150°C No 104 0.43 55-0727 55-0737 240 VAC 150°C Y es 104 0.43 55-0728 55-0738 240 VAC 105°C No 104 0.43 55-0729 55-0739 240 VAC 105°C Y es 104 0.43 55-0730 55-0740Heater SpecificationsTemperatureNominal Set Point 150°C 105°CExterior Range 60-70°C 45-55°CInterior Range 130-170°C 90-120°C Electrical Duty Cycle100 volts 72%120 volts 50%Foam Thickness0.5 in. (12.7mm)Materials Molded silicone foam, fiberglassreinforced silicone,T eflon insulatedwireRelative humidity90% MaximumConnectors Midget Twist-Lock, nylonNEMA ML-1Weight Range0.5 to 3.3 lb (0.73 to 1.5 kg) Compliance CE, UL E52951L T A Monitor SpecificationsEnclosure Black PlasticPower Requirements90-130 VAC input, 12 VDC ±3 VDCoutputPower Consumption0.3 WRelay Contact Rating SPDT, 2A @ 50 VAC resistive1@30 VDCInput/Output Wiring 1 Thermal switch line IN2 Thermal switch line OUT3 Normally closed4 Common5 Normally openDimensions 2.58” x 4.76” x 1.46” (inches) (L x H x D) 66 x 121 x 37 (mm)Compliance CEKits include any special hardware required, such as clamps.LT A- Low T emperature Alarm*Valve Heater designed to mate with heater on 3” tubing (consultfor other size tubing)**Valve Heater designed to mate with heater on 4” tubing (consultfor other size tubing)Note: Heaters can only be used with valves that are configured foruse at higher temperatures. T o obtain the order code for a heat-able throttle valve, place the letter “A” in place of the last “-” in thepart number.Example: 253B-20-40-1Becomes253B-20-40A1ASA Flange253, 653CF Flange253, 653Pressure Controller Specifications Dimensional DrawingsISO NW Flange253, 653ISO KF Flange253, 653JIS Flange253, 653153Heater Kitf or 653 Throttle ValveDimensional DrawingsPressure Controller1651Mounting bracketpositioned on front panelMounting bracketpositioned on side of unit9.40(238.8)0.88(22.4)1.63(41.5)0.40(10.2) 3.51(89.0)3.50(88.9)1.75 (19.1)9.25(234.9)Mounting bracketpositioned on front panelMounting bracket positioned on side of unit4.45(113.1)5.21(132.4)9.15(232.4)9.40(238.8)6.12(155.5)6.71(170.5)Slots 0.22x0.66 (5.5x16.7)Optional position for mounting bracketsDeviceNet™ Model6.71 (170.5)6.12 (155.5)3.38(86.0)1.63(41.5)6518.00(203 mm)3.38(86 mm)8.875(226 mm)9.469(241 mm)0.23(6 mm)3.00(76 mm)3.469(88 mm)9.00(229mm )Note: allow 2.5" (63 mm) clearance behind rear panel for connectors/cables.Heater KitFor 253 and 653 Throttle ValvesOrdering Inf ormation。
OB2273互换的高性能电流模式PWM控制器MXT7110
OB2273互换的高性能电流模式PWM控制器MXT7110
MXT7110是高性能，低待机功耗（小于100mW）和成本效益的离线反激式转换器的应用进行了优化，高度集成的电流模式PWM控制IC。
它提供完整的保护范围，自动恢复，包括逐周期电流限制（OCP），过载保护（OLP），VDD，欠压锁定（UVLO）。
它还提供锁存关闭包括过温保护（OTP），过电压（固定或可调）保护（OVP）的保护。
特点：
◆电源软启动降低MOSFET的VDS应力
◆改善EMI的频率抖动
◆改善效率和待机功率最小化的扩展burst模式设计
◆音频无噪声运行
◆固定的65kHz开关频率
◆全面的保护范围
◇VDD，根据迟滞电压锁定（UVLO）
◇循环周期的恒定输出功率限制的电流阈值设置的通用输入电压范围
◇过载保护（OLP）与自动恢复
◇过温保护（OTP）与锁存关闭
◇VDD过电压保护（OVP）闩锁关闭
◇通过外部稳压可调过压保护
◆SOT23-6封装，符合RoHS
应用范围：
离线AC / DC反激式转换器
◆LED显示器电源供应器
◆上网本/平板电脑适配器
◆电池充电器
◆电源适配器
◆机顶盒电源
◆开放式框架开关电源
典型应用：。
OB2273_Datasheet
GENERAL DESCRIPTIONBriard combines a dedicated current mode PWM controller. It is optimized for high performance, low standby power (< 100mW), and cost effective off-line flyback converter applications in 40W~60W range.Briard offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle current limiting (OCP), CS short protection, CS floating protection, over load protection (OLP), and VDD under voltage lockout (UVLO) and latch feature including over temperature protection (OTP), over voltage(fixed or adjustable) protection (OVP). Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique together with soft switching control at the totem pole gate drive output.The tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation.Briard is offered in SOT23-6 package.APPLICATIONSOffline AC/DC flyback converter for ■ AC/DC adapter■ PDA power supplies■ Digital Cameras and Camcorder Adapter ■ VCR, SVR, STB, DVD&DVCD Player SMPS ■ Set-Top Box Power■ Auxiliary Power Supply for PC and Server ■ Open-frame SMPSFEATURES■Power on Soft Start Reducing MOSFET Vds Stress■ Frequency shuffling for EMI■ Extended Burst Mode Control For ImprovedEfficiency and Minimum Standby Power Design■ Audio Noise Free Operation■ Fixed 65KHZ Switching Frequency■ Internal Synchronized Slope Compensation ■ Leading Edge Blanking on Current SenseInput■ Good Protection Coverage With Auto Self-Recoveryo VDD Under Voltage Lockout with Hysteresis(UVLO)o Over Temperature Protection (OTP) withlatcho Cycle-by-cycle over current thresholdsetting for constant output power limiting over universal input voltage rangeo Overload Protection (OLP) with auto-recoveryo Over voltage Protection(OVP) with latch o Adjustable OVP through external Zener o CS floating protection with auto-recovery o CS short protection with auto-recoveryTYPICAL APPLICATIONProduct Specificationt al Re fe r en c eGENERAL INFORMATIONPin ConfigurationThe OB2273 is offered in SOT23-6 package,shown as below.Ordering Information Part Number Description OB2273MP SOT23-6, Pb-free in T&RPackage Dissipation Rating Package R θJA(℃/W)SOT23-6 200Absolute Maximum Ratings Parameter Value VDD DC Supply Voltage 40 V VDD Zener ClampVoltage NoteVDD_Clamp+0.1VVDD DC Clamp Current 10 mA FB Input Voltage -0.3 to 7V Sense Input Voltage -0.3 to 7V RT Input Voltage -0.3 to 7V Min/Max OperatingJunction Temperature TJ -20 to 150 oCMin/Max StorageTemperature Tstg-55 to 160 oCNote:VDD_Clamp has a nominal value of 32V.Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability.I nt er n a l Re fe r en c eMarking InformationTERMINAL ASSIGNMENTSFor SOT23-6Pin Name I/O Description GND P GroundFB IFeedback input pin. The PWM duty cycle is determined by voltage level into this pinand the current-sense signal at Pin 3.RT I Dual function pin. Either connected through a NTC resistor to ground for overtemperature shutdown/latch control or connected through Zener to VDD foradjustable over voltage protectionCS I Current sense input VDD P PowerSupply Gate O Totem-pole gate driver output for power MosfetRECOMMENDED OPERATING CONDITIONSymbol ParameterMin/Max Unit VDD VDD Supply Voltage10 to 30 V T AOperating Ambient Temperature-20 to 85℃C: Optional Internal CodeI nt er n al Re fe ren c eBLOCK DIAGRAMI nt e r n al R e fe r en c eELECTRICAL CHARACTERISTICS(T A = 25℃, VDD=16V, unless otherwise noted) Symbol Parameter Test Conditions Min Typ Max UnitSupply Voltage (VDD) IstartupVDD Start up CurrentVDD=11V,MeasureLeakage current into VDD5 20 uA I_VDD_Operation Operation CurrentV FB =3V 1.8 2.5 mA UVLO(ON)VDD Under Voltage LockoutEnter6 7 8 VUVLO(OFF)VDD Under Voltage LockoutExit (Recovery)12.5 13.5 14.5VVpull-up Pull-up PMOS active 13 V Vdd_clampIvdd =10mA 30 32 34 V OVP(ON) Over voltage protectionvoltageCS=0V,FB=3VRamp up VDD until gate clock is off24 26 28 VVlatch_release Latch release voltage 5 V Feedback Input Section(FB Pin)V FB_Open V FB Open Loop Voltage 3.9 4.2 VAvcs PWM input gain ΔVFB/ΔVCS2 V/VMaximum duty cycle Max duty cycle @VDD=14V,VFB=3V,VCS=0V75 80 85 %Vref_green The threshold enter greenmode1.4 VVref_burst_H The threshold exit burstmode0.675 VVref_burst_L The threshold enter burstmode0.575 VI FB _Short FB pin short circuit current Short FB pin to GNDand measure current0.3 mAV TH _PL Power Limiting FBThreshold Voltage3.7 VT D _PL Power limiting DebounceTime80 88 96 mSecZ FB _IN Input Impedance 4 Kohm Current Sense Input(Sense Pin) Soft start time 4 ms T_blanking Leading edge blanking time 220 ns Z SENSE _IN Input Impedance 40 KohmT D _OC Over Current Detection andControl DelayFrom Over CurrentOccurs till the Gatedrive output start to turn off120nSec V TH _OC Internal Current Limiting Threshold Voltage FB=3.3V0.75 VVocp_clamper CS voltage clamper 0.9 V OscillatorF OSC Normal Oscillation Frequency VDD =14V, FB =3V,CS=0V60 65 70 KHZ△f_OSC Frequency jittering +/-4 % F_shuffling Shuffling frequency 32 Hz△f_Temp Frequency TemperatureStability1 %I nt er n al Re fe r en c e△f_VDD Frequency Voltage Stability 1 % F_Burst Burst Mode BaseFrequency22 KHZGate driver VOLOuput low level @VDD=14V, Io=5mA1 VVOH Ouput high level @VDD=14V, Io=20mA6 VV_clamp Output clamp voltage 12 VT_r Output rising time 1V ~ 12V@ CL=1000pF175 nST_f Output falling time 12V ~ 1V@ CL=500pF85 nSOver temperature protection IRT Output current of RT pin 95 100 105uA VOTP Threshold voltage for OTP 0.95 1 1.05V Td_OTP OTP debounce time 32 Cycle VRT_FL Float voltage at RT pin 2.3 VVth_OVP External OVP thresholdvoltage4 VI nt er n al Re fe r en c eCHARACTERIZATION PLOTSVDD = 18V, TA = 25℃ condition applies if not otherwise noted.OPERATION DESCRIPTIONThe Briard is a low power off-line SMPS Switcher optimized for off-line flyback converter applications in 40W~60W power range. The ‘Extended burst mode’ control greatly reduces the standby power consumption and helps the design easily to meet the international power conservation requirements.• Startup Current and Start up ControlStartup current of Briard is designed to be very low so that VDD could be charged up above UVLO threshold level and device starts up quickly. A large value startup resistor can therefore be used to minimize the power loss yet achieve a reliable startup in application. For AC/DC adapter with universal input range design, a 2 M Ω, 1/8 W startup resistor could be used together with a VDD capacitor to provide a fast startup and yet low power dissipation design solution.• Operating CurrentThe Operating current of Briard is low at 1.8mA. Good efficiency is achieved with Briard low operating current together with the ‘Extended burst mode’ control features.• Soft StartBriard features an internal 4ms soft start to soften the electrical stress occurring in the power supply during startup. It is activated during the power on sequence. As soon as VDD reaches UVLO(OFF), the CS peak voltage is gradually increased from 0.15V to the maximum level. Every restart up is followed by a soft start.• Frequency shuffling for EMI improvement The frequency Shuffling (switching frequency modulation) is implemented in Briard. The oscillation frequency is modulated so that the tone energy is spread out. The spread spectrum minimizes the conduction band EMI and therefore eases the system design.• Extended Burst Mode OperationAt light load or zero load condition, most of the power dissipation in a switching mode power supply is from switching loss on the MOSFET, the core loss of the transformer and the loss on the snubber circuit. The magnitude of power loss is in proportion to the switching frequency. Lower switching frequency leads to the reduction on the power loss and thus conserves the energy.The switching frequency is internally adjusted at no load or light load condition. The switch frequency reduces at light/no load condition to improve the conversion efficiency. At light load or no load condition, the FB input drops below burst mode threshold level and device enters Burst Mode control. The Gate drive output switches only when VDD voltage drops below a preset level and FB input is active to output an on state. Otherwise the gate drive remains at off state to minimize the switching loss and reduces the standby power consumption to the greatest extend.The switching frequency control also eliminates the audio noise at any loading conditions.• Oscillator OperationThe switching frequency of Briard is internally fixed at 65KHZ. No external frequency setting components are required for PCB design simplification.• Current Sensing and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in Briard current mode PWM control. The switch current is detected by a sense resistor into the sense pin. An internal leading edge blanking circuit chops off the sensed voltage spike at initial internal power MOSFET on state due to snubber diode reverse recovery and surge gate current of power MOSFET so that the external RC filtering on sense input is no longer needed. The current limiting comparator is disabled and cannot turn off the internal power MOSFET during the blanking period. The PWM duty cycle is determined by the current sense input voltage and the FB input voltage.• Internal Synchronized Slope Compensation Built-in slope compensation circuit adds voltage ramp onto the current sense input voltage for PWM generation. This greatly improves the close loop stability at CCM and prevents the sub-harmonic oscillation and thus reduces the output ripple voltage.• DriveThe power MOSFET is driven by a dedicated gate driver for power switch control. Too weak the gate drive strength results in higher conduction and switch loss of MOSFET while too strong gate drive results the compromise of EMI.A good tradeoff is achieved through the built-in totem pole gate design with right output strengthI nt er n al Re fe r en c eand dead time control. The low idle loss and good EMI system design is easier to achieve with this dedicated control scheme. • Protection ControlsGood power supply system reliability is achieved with auto-recovery protection features including Cycle-by-Cycle current limiting (OCP), Over Load Protection (OLP), CS short protection, CS floating protection, and Under Voltage Lockout on VDD (UVLO), and latch features including over temperature protection (OTP), fixed or adjustable over voltage protection (OVP).With On-Bright Proprietary technology, the OCP is line voltage compensated to achieve constantoutput power limit over the universal input voltage range.At overload condition when FB input voltage exceeds power limit threshold value for more than TD_PL, control circuit reacts to shut down the switcher. Switcher restarts when VDD voltage drops below UVLO limit. For latch mode, control circuit shutdowns (latch) the power MOSFET when an Over Temperature condition or Over Voltage condition is detected until VDD drops below 5V (Latch release voltage) , and device enters power on restart-up sequence thereafter .I nt er n al Re fe r en c ePACKAGE MECHANICAL DATADimensions In Millimeters Dimensions In Inches SymbolMin Max Min MaxA 1.000 1.300 0.039 0.051 A1 0.000 0.150 0.000 0.006 A2 1.000 1.200 0.039 0.047 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 D 2.800 3.020 0.110 0.119 E 1.500 1.700 0.059 0.067 E1 2.600 3.000 0.102 0.118 e 0.950 (BSC) 0.037 (BSC)e1 1.800 2.000 0.071 0.079 L 0.300 0.600 0.012 0.024 θ 0º 8º 0º 8ºI nt er n al Re fe r en c e©On-Bright Electronics Confidential Preliminary DatasheetOB_DOC_DS_227300- 11 - OB2273 Current Mode PWM Power Switch Frequency ShufflingIMPORTANT NOTICERIGHT TO MAKE CHANGESOn-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements, improvements and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.WARRANTY INFORMATIONOn-Bright Electronics Corp. warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with its standard warranty. Testing and other quality control techniques are used to the extent it deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed.On-Bright Electronics Corp. assumes no liability for application assistance or customer product design. Customers are responsible for their products and applications using On-Bright’s components, data sheet and application notes. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards.LIFE SUPPORTOn-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in medical applications.MILITARYOn-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in military applications.I nt e r n a l R e f e r e n c e。
基于OB2273的单端反激式开关电源设计
基于OB2273的单端反激式开关电源设计韩召成;文定都;胡正国;任于涵【摘要】设计了一种基于OB2273的单端反激式开关电源.先介绍了开关电源的设计原理,再分析部分模块的功能及工作原理.为了满足电源的电磁兼容性和输出电压的稳定性等要求,利用EMI滤波器滤除干扰,采用稳压源TL431和光耦实现了反馈.实验测试结果表明,该开关电源具有输出直流电压稳定、转换效率高、纹波小、体积小等优点,满足设计要求.【期刊名称】《湖南工业大学学报》【年(卷),期】2017(031)004【总页数】5页(P39-43)【关键词】OB2273;反激式;开关电源【作者】韩召成;文定都;胡正国;任于涵【作者单位】湖南工业大学电气与信息工程学院,湖南株洲 412007;湖南工业大学电气与信息工程学院,湖南株洲 412007;湖南工业大学电气与信息工程学院,湖南株洲 412007;湖南工业大学电气与信息工程学院,湖南株洲 412007【正文语种】中文【中图分类】TN86随着电力电子技术的快速发展，开关电源朝着集成化、小型化、高频化的方向发展，并在日常生活中得到了广泛运用。
开关电源和线性电源相比，具有以下特点：效率高，体积小，可靠性高，稳压范围广，性能好，驱动能力强[1-3]。
开关电源的控制方式有电压控制方式和电流控制方式2种。
电流型PWM（pulse width modulation）开关电源和电压型PWM开关电源相比，具有输出稳定性好、电压和负载调整率高等特点[4-8]。
文献[4]提出了电流型PWM整流器直流侧滤波器，通过选取适当的滤波器参数，减少了电抗压降带来的损耗，提高了系统效率。
文献[5]提出了电流型整流器双闭环多变量反馈控制策略，该策略优化了系统性能，提高了系统的抗干扰性与稳定性。
文献[6]提出了基于空间矢量的三相CSR（current source recti fi er）低电压应力控制方法，使三相CSR电流具有电流利用率高、开关损耗小、动态响应快等优点。
OB2273 Demo Board Manual
2
3 Performance Evaluation..................................................................................................................... 10 3.1 Input Characteristics ................................................................................................................11 3.1. 1 Input current and Standby power ............................................................................................11 3.1. 2 Efficiency .................................................................................................................................11 3.2 Output Characteristics .............................................................................................................11 3.2.1 Line Regulation & Load Regulation..........................................................................................11 3.2.2 Ripple & Noise......................................................................................................................... 12 3.2.3 Overshoot & Undershoot ....................................................................................................... 13 3.2.4 Dynamic Test ......................................................................................................................... 14 3.2.5 Time Sequence...................................................................................................................... 14 3.3 Protections .............................................................................................................................. 15 3.3.1 Over Current Protection (OCP) ............................................................................................. 15 3.3.2 Over Voltage Protection (OVP).............................................................................................. 15 3.3.3 Over Load Protection (OLP) .................................................................................................. 16 3.3.4 Over Temperature Protection (OTP)...................................................................................... 16 3.4 EMI Test.................................................................................................................................. 17 3.4.1 Conduction EMI Test ............................................................................................................. 17 3.4.2 Radiation EMI Test ................................................................................................................ 18 4 Other important waveform ................................................................................................................. 19 4.1 CS, FB, Vdd & Vds waveform at no load/full load. ................................................................. 19 4.2 Vds waveform at full load, start/normal/output short............................................................... 19 4.2.1 VDS at full load, start/normal/output short .............................................................................. 19 4.2.2 Vds at full load, start waveform ............................................................................................... 20 4.2.3 Vds at full load, normal waveform ........................................................................................... 20 4.2.4 Vds at full load, output short waveform ................................................................................... 20
电化学工作站2273说明书
PARSTAT 2273Advanced Potentiostat/Galvanostat/FRA®Princeton Applied ResearchWe would like to introduce the new benchmark!The PARSTAT 2273 is the combination of the renowned reliability, high current, and high compliance voltage of the 273A with the exceptional impedance capability, resolution, speed and latest software techniques of our new PARSTAT family. Plus we’ve incorporated customer feedback to provide not only more internal maximum current but the ability to boost the 20 A and the ability to interface all the ancillary equipment customers need today for their unique research.The 2273 is designed to be the most comprehensive potentiostat/galvanostat/FRA in your laboratory. Since no one can predict how research needs will evolve over the years, we’ve designed the ultimate electrochemical tool to satisfy your needs not only for today — but for tomorrow.Major Features• 2 A current max. (20 A boosted)• 100 V compliance• 1.2 fA current resolution • >1013Ωinput impedance • <5 pF of capacitance• 10 µHz to 1 MHz built in analyzer for impedanceFor more than two decades, the 273/273A has been the most popular instrument in the history ofcomputer-controlled potentiostats/galvanostats. We knew how critical it would be that the next generation of this prestigious instrument continue to set the standard against which all other systems will be measured.Applications• Research Electrochemistry • Corrosion • Sensors• Batteries/Fuel Cells• Electrodeposition/Plating • Biomedical ApplicationsGeneral SpecificationsThe 2273 is an advanced potentiostat/galvanostat/FRAthat consists of hardware capable of ±10 V scan ranges, 2 A current capability, and EIS measurements from 10 µHz to 1 MHz. The interface to the PC or laptop is Universal Serial Bus (USB), so there is no need for an additional card for your system. Electrochemistry PowerSuite software is required for the 2273.Current and VoltageUnlike any other potentiostat on the market today, the 2273 offers a unique combination of compliance voltage up to±100 V (power available at the counter electrode) and a maximum current of up to ±2 A.EIS CapabilityThe 2273 hardware combined with PowerSINE software can perform EIS experiments from 1 MHz to 10 µHz. These measurements can control either potentiostatic (Single Sine, Fast MultiSine, or Mott-Schottky), or galvanostatic (Galvanostatic EIS) experiments.Booster InterfaceThe 2273 has three current booster options to choose from:• 8A/2273 option for 8 A, 50 V• 10A/2273 option for 10 A, 20 V• 20A/2273 option for 20 A, 20 VUsing the 2273 with one of the current booster options provides the user witha seamless interface for our PowerSuite software. When a booster option isconnected to the 2273, the software will autoscale the data.2PARSTAT 2273Advanced Potentiostat/Galvanostat/FRA®3EIS Contour Plot for the 2273Princeton Applied Research has performed a series of impedance experiments on known resistive and capacitive cells and has evaluated the accuracy of these measurements. The typical results are summarized on the contour plot.The experiments were made in the potentiostatic EIS mode, using a standard amplitude of 10 mV. The blue area is the region for which the error in theimpedance is less than 1% or 2°.4ApplicationsResearch ElectrochemistryThe physical nature of electrochemistry has resulted in a broad range of research areas. Fromdetermining the kinetics of an electron-transfer process, to developing new and improved materials via unique electrodeposition or electrosynthesis techniques, the 2273 was designed with the flexibility and capability required by today's electrochemical researcher. Whether it is amicroelectrode, rotating disk electrode, mercury electrode, or quartz crystal resonator being measured, the 2273 supports the wide array of electrodes used in a modern electrochemical research lab.CorrosionThe 2273 is ideal for corrosion research. For measurements of rebar in concrete or titanium in Ringer's solution, the 2273 was designed to address a wide range of corrosion applications.PowerCORR Corrosion Software and PowerSINE EIS Software complement the 2273'simpressive specifications to create the ultimate tool for any corrosion lab. Are you working with large electrodes or resistive media? The 2273's 100 V compliance voltage takes care of that.Studying a new corrosion inhibitor or coating technology? Femtoamp current resolutions and >1013input impedance make even the toughest EIS measurements seem routine.SensorsFor potentiometric sensors (such as ion-selective electrodes and coated wire electrodes) and amperometric sensors (gas sensors, thin film microelectrodes, and chemically modifiedelectrodes), the 2273 provides current sensitivities that can surpass the requirements of the most demanding measurement parameters, with a pA current range and fA resolution; high compliance voltage allows for the growth of thin film electrodes and nanodeposition. Biosensordevelopment and analysis relies on techniques that are contained within the PowerCV cyclic voltammetry, PowerSTEP chronoamperometry/chronopotentiometry and PowerPULSE electroanalytical software packages.Fuel Cells and BatteriesFor many years, Princeton Applied Research potentiostats/galvanostats have been utilized to further the development of new energy sources. From the early stages of battery development to the charge/discharge experiments on the final product, the 2273 has the current measurement range to address the challenges that lie ahead for the next generation ofbatteries. Fuel Cells offer a cleaner energy source for the future, and the 2273 helps bring that technology to market. Use EIS to examine the impedance of the PEM at different humiditylevels, perform I/V curves on SOFCs, or run CVs on DMFC assemblies. The 2273 and the entire PowerSuite package has the potential to take your research to the next level.Biomedical ApplicationsThe 2273 exceeds the requirements of a potentiostat/galvanostat as described in ASTM F2129, “Standard Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements to Determine the Corrosion Susceptibility of Small Implant Devices.” For implant biocompatibility studies, the most common methods involve DC corrosion techniques such as cyclic potentiodynamic polarization for the determination of the breakdown or critical pitting potential (Eb), the corrosion or open circuit potential (Ecorr), the repassivation or protection potential (Ep), corrosion current (Icorr) and corrosion rates based on Tafel analysis. All of these techniques are possible with the 2273 using the PowerCORRcorrosion measurement software package. The outstanding performance of the 2273 ensures that the results obtained are accurate and allows the user to be confident of their data.PARSTAT 2273Advanced Potentiostat/Galvanostat/FRA®5Ordering InformationModelDescription2273Advanced Potentiostat/Galvanostat/FRA 8A/22738 A @ 50 V Booster Option 10A/227310 A @ 20 V Booster Option 20A/227320 A @ 20 V Booster OptionPowerSuite Software ModulesPowerSINE ®Electrochemical Impedance Spectroscopy PowerCORR™Corrosion Measurement PowerCV ®Cyclic VoltammetryPowerSTEP ®Chronoamperomtry/Chronopotentiometry PowerPULSE™Electroanalytical TechniquesCable AccessoriesC0379Additional 2273 Cell CableC03802273 to Glove Box Interface Cable (call for information and quotation)Cell AccessoriesK0047Corrosion Cell Kit K0235Corrosion Flat Cell K0264Micro-Cell Kit RDE0018Analytical Cell KitAncillary Equipment303A Static Mercury Drop Electrode 507Interface for the Model 303A QCM922Quartz Crystal Microbalance 616Rotating Disk Electrode636Rotating Ring-Disk ElectrodeExtended Warranty2273-EWSilver Extended Warranty Plan for the 2273Princeton Applied Research offers extended warranties and/or site service contracts on all its instruments. There are three levels of coverage starting with the basic silver level that is a one-year extension of our free one-year initialwarranty. Silver level extended warranty includes labor, material, and return shipping. The Gold and Platinum levels offer an increased product protection plan, including priority repair and free loaner instruments if available.ISO9001:2000 CertifiedPrinceton Applied Research is a member of Advanced Measurement Technology, Inc., an ISO9001:2000 certified company.SoftwareDiscover the power of true 32-bit Windows programs in the Princeton Applied Research PowerSuite software platform.Take advantage of powerful wizards, graphical data presentation formats and easy-to-use import/export tools for both graphs and data.PowerPULSE™• Recurrent Potential Pulsing • Recurrent Galvanic Pulsing • Square Wave Voltammetry• Cyclic Square Wave Voltammetry • Differential Pulse Voltammetry• Cyclic Differential Pulse Voltammetry • Normal Pulse Voltammetry• Reverse Normal Pulse Voltammetry • R ΩDeterminationPowerCV ®• Linear Scan• Ramp Cyclic VoltammertyOne Vertex Two VertexOne Vertex/Multi Cycle Two Vertex/Multi Cycle• Stair Case Cyclic VoltammetryOne Vertex Two VertexOne Vertex/Multi Cycle Two Vertex/Multi CyclePowerSTEP ®• One Step Chronoamperometry • Two Step Chronoamperometry • ChronopotentiometryPowerSINE ®• Potentiostatic EIS • Multi-Sine EIS • Galvanostatic EIS• Potentiostatic Impedance versus Time • Galvanostatic Impedance versus Time • Mott-ShottkyPowerCORR™• Tafel Plot• Anodic Polarization • Linear Polarization • Potentiostatic • Galvanostatic• Ecorr versus Time • Galvanic Corrosion • Cyclic Polarization• Cyclic Polarization (no reverse)• Zero Resistance Ammeter • Galvanodynamic• Galvanodynamic (no reverse)6Recurrent Galvanic Pulsing (PowerPULSE)Impedance vs. Time (PowerSINE)Differential Pulse (PowerPULSE)Two Step Chronoamperometry (PowerSTEP)Peak Analysis Tools (PowerCV)Anodic Polarization (PowerCORR)7Advanced Potentiostat/Galvanostat/FRAData Storage FormatPowerSuite’s unique data storage format ulitizing Microsoft ®ACCESS database provides other powerful features available to PowerSuite. These include making changes to someexperimental parameters on the fly, performing fits on data as it is being collected, searching data files based on comments added by the user, and exporting data and plots to otherprograms such as Microsoft Excel and PowerPoint.Complete Plotting ControlOverlay data can be placed on the plots prior to acquiring the data, which allows the user to compare the two data sets as the experiment progresses!Overlaid data graphical properties can also be modified in terms of color or plot style, and any overlaid data can be selected to become the "active" data file, at which point the current file becomes an overlay, and full data analysis can be performed on what was an overlay! A number of graphical and analyticalfeatures are available by simply right-clicking on any graph and selecting from a full complement of options.Experiment WizardFor new users, the "New Experiment Wizard" guides you through a step-by-step process to configure all aspects of the experiment. If you have a setup that is to be repeated over several experiments, it can be "Saved as a Template...", recalled, and executed without having to re-enter information with each use.Powerful GraphicsPowerSuite’s dominant features are it’s graphical capabilities. Tremendous flexibility is provided with data presentation.Up to four plots can be viewed simultaneously, on the screen without opening a separate viewing program. Severaldefault plots are available, and the user has the ability to modify each graph or create and save their own custom graphs according to specified criteria. Awide variety of parameters are available for plotting, as well as the ability to add a second Y-axis or view the plot in 3D. The user can select the data symbols/lines desired, as well as change the color of any plot. Additional graphical features allow the data of any axis to be mathematically changed (by choosing to either add, subtract, divide, or multiply the axis values) using the Data Factors feature.This feature can be used to change data in amps to microamps for comparison purposes. It can also be used to convert a potential reading acquired from an ancillary component (such as a temperature probe) through the A/D Input into its proper value (such as degrees C).Specifications subject to change042804 info@ 801 South Illinois Avenue, Oak Ridge, TN 37831-0895 U.S.A.(800) 366-2741 or (865) 482-4411 • Fax (865) 425-1334For International Office Locations, Visit Our WebsiteADVANCED MEASUREMENT TECHNOLOGYPrinceton Applied Research Advanced Potentiostat/Galvanostat/FRASpecificationsPower AmplifierCompliance Voltage: ±100 VMaximum Current: ±2 ARise Time: <250 ns (No Load)Slew Rate: >15 V/µs (No Load)System PerformanceMinimum Time Base: 20 µsMinimum Potential Step: 2.5 µVNoise and Ripple: <50 µV/rms (typical)Minimum Current Range: 2 nA(hardware)Minimum Current Range: 40 pA(after 50X gain) Minimum Current Resolution: 1.2 fAiR CompensationPositive Feedback Range: 2000 MΩto 2 Ω(depending on current range)Current Interrupt: 16 bit DAC Potential Error Correction Current MeasurementRanges: 12 decades, 2 A to 40 pA(with internal gain applied)Accuracy (dc)20 µA to 2A: <0.4% Full Scale20 nA and 1 µA Ranges: <0.5%2 nA< 0.75%Frequency Response (small signal)2 mA Range:3 dB at >1 MHz, 1k source impedance20 µA Range: 3 dB at >100 kHz, 100k source impedance Differential ElectrometerInput Bias Current: <5 pA at 25°CMax. Voltage Range: ±10 VMax. Input Voltage Differential: ±10 VBandwidth: 3 dB @ >15 MHzCommon Mode Rejection:>80 dB at 100 Hz>60 dB at 100 kHzInput Impedance: >1013Ωin parallel with <5 pF Potential/Current ControlDigital/Analog Converters (DACs)Bias DACResolution: 16 bitsRange (Potentiostat): ±10 VRange (Galvanostat): ±100% of full-scale current Modulation DACResolution: 16 bitsImpedance SpecificationsFrequency Range: 10 µHz–1 MHz Dimensions58 cm W x 47.6 cm D x 22.9 cm H(20" W x 18.75" D x 9" H)Weight31 kg (68 lbs)Power Requirements90/130 V AC or 200/260 V AC, 50-60 Hz600 Watts MaximumComputer InterfaceUniversal Serial BusPowerSuite Software (sold separately) PowerSINE Electrochemical Impedance Spectroscopy PowerCORR Corrosion MeasurementPowerCV Cyclic VoltammetryPowerSTEP Chronoamperometry/Chronopotentiometry PowerPULSE Electroanalytical SoftwareFor discounts available on bundled packages, please contact your local sales representative.Operating SystemMicrosoft Windows‚ 95/98/2000/NT/XP。
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Omega 22 mm OMPBD7 推按钮和选择开关系列产品说明书
22 mm PILOT DEVICES OMPBD7 SERIESPUSHBUTTONS AND SELECTOR SWITCHESOmegas rugged OMPBD7 pilot devices offer maximum flexibility and a wide choice for all applications. This 22 mm line is aesthetically appealing and modularly designed to make assembly and interchangeability easy. The OMPBD7 operators are available in two different body styles to meet every application need. Both operators exhibit a new lower profile stylish appearance while maintaining the rugged performance necessary for demanding environments.Two Operator TypesOMPBD7P is a plastic operator with acaptive black plastic front bezel. Constructed of high-grade thermoplastics, the OMPBD7P is the corrosion resistant solution for harsh environments. For super tough applications,the OMPBD7M has a die-cast zinc housing and mounting ring for a rugged durability.Both are finished with corrosion resistant chrome plating. The OMPBD7M also features a captive shiny metal bezel for a polished appearance.Quick, Easy InstallationA standard anti-rotation tab keeps front elements from turning or falling off the control panel, making it possible for one person to install all OMPBD7components even if the front and rear panel are not accessible at the same time. A central mounting ring allows for quick installation and removal of all OMPBD7 operators. All back-of-panel components including contact blocksand power module elements snap-on and are readily accessible and interchangeable without removing the pilot device from the panel.Tool-Less Mounting LatchThe OMPBD7 “tool-less” mounting latch mates the front element with the contact blocks and other back-of-panel components.The mounting latch is available in a plastic and metal design. The latches are easily installed with a “click” and removed by pushing a rotating collar to the right. Quick,reliable and strong, it’s the best pilot device mounting latch available in the industry.Long Electrical and Mechanical LifeMost OMPBD7 operators have a mechanical of ten million operations… five million contact blocks. Electrical life ranges from 500,000 cycles at 3 A to ten million at 0.1 A.The OMPBD7 line is also electronics compatible with self cleaning contacts.Environmental RatingsFront elements, including pushbuttons,mushroom operators and selector switches,are IP66 rated against submersion, oil and dirt, making them reliable in the toughest industrial environments. Metal operators are NEMA 4/13 rated and plastic operators are rated NEMA 4/4X/13.OMPBD7M-F3PX10, $24, metal pushbutton,flush button, green,momentary operation with 1 NO contact.OMPBD7P-E4PX10, $24, plastic pushbutton,extended button, red,momentary operation with 1 NO contact.OMPBD7P-MT34PX01, $45,plastic pushbutton, 30 mm mushroom, red, maintained operation with 1 NC contact.Each pushbutton includes one contact block. Units shown with two additionalblocks (pushbuttons may be used with up to 6 contacts)see page I-26.l Heavy-Duty/Oil Tight Pushbuttonsl Quick Installation with Tool-Less Mounting Latchl Plastic Operators: NEMA 4/4X/13and IP65/66 Ratedl Metal Operators: NEMA 4/13 and IP65/66 Ratedl Touch-Safe ContactBlocks–with IP20 Recessed Screw Terminalsl Heavy-Duty Current Rating(10A Continuous)All models shownlarger than actual size.Additional Featuresand OptionsHeavy-Duty Ratings—The OMPBD7 lineis UL 46E, NEMA A600 and Q600 listed. All components carry a 10 Amp continuous current rating, covering all industrial control needs.All Major Approvals—OMPBD7 front elements are UL Recognized, while all OMPBD7 assemblies are UL Approved. The line is also approved by every major international agency making themideal for export requirements.H-Bridge & Gold Plated Contacts—By doubling the available paths for current to pass through the contacts, the standard H-bridge design provides a cleaner current flow. Gold plated contacts quadruple the current paths for increased contact reliability in low voltage applications.Touch-Safe—Back of panel components are finger safe, with IP20 protection.Long Lasting Integral LED Assemblies—Our new LED lamps last up to 11 years! They are conveniently offered as a complete unit for all illuminated operators which include the one piece Integral LED Module. They come in five different colors: amber, blue, green, red and white.OMPBD7M-HM22PX01, two way metal selector switch with long knob.Each unit includes tool-less mounting latch and one normally closed contact block.Shown with two additional (up to 6 total per operator possible) normally opencontact blocks, model OMPBD7-X10, $8.50 each.All shown largerthan actual size.CONTACT BLOCKSRed = normally closed.OMPBD7-X01, $8.50.OMPBD7-X10, $8.50.Green = normally open.Rear view.OMPBD7P-LMM43PX10, $39, plastic pushbutton,green, 40 mm mushroom,momentary operation, one NO contact, shown larger than actual size.OMPBD7P-LE4PX01, $30, plastic pushbutton, extended button, red, momentary operation, one NC contact,shown larger than actual size.22 mm PUSHBUTTONSILLUMINATED PUSHBUTTONS AND E-STOPSOMPBD7-IL Series Start at$51(Specify Model Number)MOST POPULAR MODELS HIGHLIGHTED!used per operator (light module occupies center position).*Insert number for color selection, 2= black, 3= green, 4= red, 5= yellow, 6= blue.Complete with pushbutton and light moduleEach operator includestool-less mounting latch and one contact block. Shown with two additional (up to 4total per operator possible)contact blocks.used per operator.Front-of-Panel (Operators)1Notes:1Performance data given in this publication is provided only as a guide for the user in determining suitability and do not constitute a performance warranty of any kind. Such data may represent the results of accelerated testing at elevated stress levels, and the user is responsible for correlating the data to actual application requirements. ALL WARRANTIES AS TO ACTUAL PERFORMANCE, WHETHER EXPRESS OR IMPLIED, ARE EXPRESSLY DISCLAIMED.2Momentary mushroom operators are IP65, multi-function operators are not Type 13 rated. Plastic operators with keys are not Type 4X rated.3Operating temperatures below 0°C (32°F) are based on the absence of freezing moisture and liquids, UL recognized to 55°C (131°F)incandescent module, max 40°C (104°F).22 mm PILOT DEVICESHEAVY-DUTY/OIL TIGHT PUSHBUTTONSAND SELECTOR SWITCHES OMPBD7 SERIESNon-illuminated pushbuttons, shown on pages I-25 and I-26.Notes:1Performance data given in this publication is provided only as a guide for the user in determining suitability and do not constitute a performance warranty of any kind. Such data may represent the results of accelerated testing at elevated stress levels, and the user is responsible for correlating the data to actual application requirements. ALL WARRANTIES AS TO ACTUAL PERFORMANCE, WHETHER EXPRESS OR IMPLIED, ARE EXPRESSLY DISCLAIMED.4Low voltage contacts are recommended for applications below 17 V, 5 mA.5Wires less than #18 (0.75 mm2) may not hold in terminal securely.CANADA www.omega.ca Laval(Quebec) 1-800-TC-OMEGA UNITED KINGDOM www. Manchester, England0800-488-488GERMANY www.omega.deDeckenpfronn, Germany************FRANCE www.omega.fr Guyancourt, France088-466-342BENELUX www.omega.nl Amstelveen, NL 0800-099-33-44UNITED STATES 1-800-TC-OMEGA Stamford, CT.CZECH REPUBLIC www.omegaeng.cz Karviná, Czech Republic596-311-899TemperatureCalibrators, Connectors, General Test and MeasurementInstruments, Glass Bulb Thermometers, Handheld Instruments for Temperature Measurement, Ice Point References,Indicating Labels, Crayons, Cements and Lacquers, Infrared Temperature Measurement Instruments, Recorders Relative Humidity Measurement Instruments, RTD Probes, Elements and Assemblies, Temperature & Process Meters, Timers and Counters, Temperature and Process Controllers and Power Switching Devices, Thermistor Elements, Probes andAssemblies,Thermocouples Thermowells and Head and Well Assemblies, Transmitters, WirePressure, Strain and ForceDisplacement Transducers, Dynamic Measurement Force Sensors, Instrumentation for Pressure and Strain Measurements, Load Cells, Pressure Gauges, PressureReference Section, Pressure Switches, Pressure Transducers, Proximity Transducers, Regulators,Strain Gages, Torque Transducers, ValvespH and ConductivityConductivity Instrumentation, Dissolved OxygenInstrumentation, Environmental Instrumentation, pH Electrodes and Instruments, Water and Soil Analysis InstrumentationHeatersBand Heaters, Cartridge Heaters, Circulation Heaters, Comfort Heaters, Controllers, Meters and SwitchingDevices, Flexible Heaters, General Test and Measurement Instruments, Heater Hook-up Wire, Heating Cable Systems, Immersion Heaters, Process Air and Duct, Heaters, Radiant Heaters, Strip Heaters, Tubular HeatersFlow and LevelAir Velocity Indicators, Doppler Flowmeters, LevelMeasurement, Magnetic Flowmeters, Mass Flowmeters,Pitot Tubes, Pumps, Rotameters, Turbine and Paddle Wheel Flowmeters, Ultrasonic Flowmeters, Valves, Variable Area Flowmeters, Vortex Shedding FlowmetersData AcquisitionAuto-Dialers and Alarm Monitoring Systems, Communication Products and Converters, Data Acquisition and Analysis Software, Data LoggersPlug-in Cards, Signal Conditioners, USB, RS232, RS485 and Parallel Port Data Acquisition Systems, Wireless Transmitters and Receivers。
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2.引脚说明：OB2273 封装形式SOT23-6
管脚名称管脚编号VDD RT FB GATE GND CS
NCT
OB2273
OB2273 系统工作模式示意图
OB2273 采用在重载条件下采用固定频率工作模式。
随着负载降低，进入降频工作模式，提高轻载效率；在负载较轻或空载时，系统进入间歇工作模式，从而降低功耗。
各模式的切换通过系统反馈电压FB来控制，如上图所示：
Current-Mode PWM OB2273
RT 仅作为RT仅作为
OVP Latch protection RT作为OTP and OVP Latch protection
optional
Current-Mode PWM OB2273
Current-Mode PWM OB2273 (1)(2) (3)
快速启动电路
⑤
①
②③
⑥
⑦④
案例一(40W)：100mW设计关键点
Current-Mode PWM OB2273系统高低压补偿设计电路
Current-Mode PWM OB2273普通反馈补偿电路
增加极点反馈补偿电路
Current-Mode PWM OB2273
20V
264Vac:SCP,saturation voltage (Vds_sat) is high. Cs pin RC设计
Add RC circuit to reduce drain saturation voltage across MOS.
CS pin R*太大造成Vds冲高现象
从上图FB(红色）波形，可以看到环路加快，从而避免了Vds冲高现象
Current-Mode PWM OB2273
Current-Mode PWM OB2273说明：１）100mW以下方案设计，效率>87%.
Current-Mode PWM OB2273
Thank you !。