SMD736

S M D 736FEATURESDESCRIPTIONWide input voltage range, up to 40V Guaranteed 3A output currentWide adjustable version output currentrange, from 0A to 3A max over line and load conditions150 kHz fixed frequency internal oscillator Dimming control by PWM or Voltage AdjustmentRequires only 6 external componentsThermal shut down and current limit protectionThe SMD736 series of regulators are step-down regulators with all required active functions. It iscapable of driving 3A load with excellent line and load regulations.The SMD736 requires a minimum number of external components. These features substantially not only reduce the area of board size but also the size of the heat sink, and in some cases no heat sink is required. Other features include a guaranteed ± 4% tolerance on output current within specified input voltages and output load conditions. And ±10% on the oscillator frequency. External shutdown is included, featuring 70µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.APPLICATIONSHigh Efficiency Step-Down LED Drivers LED Lighting LED MonitorsAutomotive LED Lighting3 A Power LED Driver with Dimming ControlPIN FUNCTIONSPin No.Pin NameFunction1 I SET Output Current Set2 PWM_D Frequency Set and PWM Dimming3 Gnd Ground4 Output Output 5DR INDriver InputABSOLUTE MAXIMUM RATINGSInput Voltage45VPWM_D Pin Input Voltage-0.3V < V < + V IN Operating Junction Temperature, T J 150°C Storage Temperature Range-65°C to 150°C Lead Temperature (soldering, 10 seconds)260°CNote: Exceeding these ratings could cause damage to the device. All voltages are with respect to ground. Currents are positive into, negative out of the specified terminal.POWER DISSIPATION TABLEThermal Resistance-Junction to Tab, θJT 3.0°C / W Thermal Resistance-Junction to Ambient, θJA45°C / W1. Junction Temperature Calculation: T J = T A + (P D × θ JA ).2. The θJA numbers are guidelines for the thermal performance of the device/pc-board system.3. All of the above assume no ambient airflow.BLOCK DIAGRAMPWM_DOUTPUTI SETGndRECOMMENDED OPERATING CONDITIONSParameter Symbol Min Typ Max UnitsInput Voltage DR IN 40 VJunction temperatureT J-40125OCTYPICAL APPLICATIONSFigure 1 - PWM Dimming Application CircuitsFigure 2 - Voltage Dimming Application CircuitsV INLED +LED -Dimming PWMV IN LED +LED -Dimming: 1.23V ~ 2.46VELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply DRIN = 12V, I LOAD = 0.5A and theoperating ambient temperatures T A = 25°CParameter Test Conditions Min Typ Max UnitsV OUTPUT = 5V1.217 1.230 1.243 V OUTPUT = 5V, 8V ≤ DR IN ≤ 40V, 1.193 1.230 1.267 I SET Voltage (Note 1)V OUTPUT = 5V, 8V ≤ DR IN ≤ 40V, 0.5A ≤ I LOAD ≤ 3A, -40°C ≤ T J ≤ 125°C 1.180 1.230 1.286 VEfficiency I LOAD = 0.7A, V OUTPUT = 5V, DR IN = 16V 79 % T J = 25°C50 100 I SET Bias Current V OUTPUT = 5V -40°C ≤ T J ≤ 125°C 500 nA Oscillator Frequency (Note 6)T J = 25°C127 150 173 kHz T J = 25°C1.4 1.8 Saturation Voltage I LOAD = 3A (Note 2)-40°C ≤ T J ≤ 125°C 2.0 V Duty Cycle (ON) (Note 3) 9398 % T J = 25°C4.2 7 8.8 Current Limit(Note 2, 6)-40°C ≤ T J ≤ 125°C 3.5 7.2 9 AV OUT = 0V 0.3 2 Output Leakage Current (Note 4, 5) V OUT = -1V9 20 mA Quiescent Current (Note 4) 5 10 mA Standby CurrentI SET = 5V70 200 µAT J = 25°C2.2 1.4 PWM_D Threshold VoltageHighV OUTPUT = 0V-40°C ≤ T J ≤ 125°C2.4 T J = 25°C 1.2 1.0 PWM_D Threshold Voltage Low V OUTPUT = Normal Output Voltage -40°C ≤ T J ≤ 125°C 0.8 VPWM_D = 5V 12 30 PWM_D Pin Input CurrentPWM_D = 0V10µANote 1: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance.Note 2 OUTPUT pin sourcing current. No diode, inductor or capacitor connect to OUTPUT. Note 3: I SET is removed from V OUT and connected to 0V.Note 4: For these parameters, I SET is removed from OUTPUT and connected to +12V to force the output transistor OFF.Note 5: DR IN = 40VNote 6:The oscillator frequency reduces to approximately 11kHz in the event of fault conditions, such as output short or overload. And the regulated output voltage will drop approximately 40% from the nominal output voltage. This self-protection feature lowers the average power dissipation by lowering the minimum duty cycle from 5% down to approximately 2%.PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise specified5 Lead TO 220(0.38 - 0.03)(2.67 - 0.38)5 Lead TO 2635 Lead TO 2630.390 - 0.410(9.91 - 10.41)736 YYWWIMPORTANT NOTICEShamrock Micro Devices (SMD) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current.A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. SMD integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of SMD products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer’s applications, the customer should provide adequate design and operating safeguards.。