092ICEPOWER250AS

ICEpower250A, 250W Analog Amplifier Version 1.3 022022ContentGeneral Description (2)Connection Diagram (3)Absolute Maximum Ratings (4)Electrical Specifications (4)Timing Specifications (5)Typical Performance Characteristics (5)Application Information (9)Thermal design (14)Layout/Power Supply (14)Physical Dimensions (ICEpower250A-IC) (15)Physical Dimensions (ICEpower250A-HC) (16)Notice (17)Bang & Olufsen ICEpower a/sGl. Lundtoftevej 1bDK-2800 LyngbyDenmarkPhone: [45] 45 20 36 00Fax: [45] 45 20 36 99E-mail: ICEpowerinfo@bang-olufsen.dkWeb site: General DescriptionICEpower250A has been designed using ICEpower ® technology tooffer state-of-the-art audio amplification.Figure 1, ICEpower250A, 250W Analog AmplifierSize: 3.2”x 3.2”x 1”With its full audio bandwidth ICEpower250A is the natural choice in many audio applications such as:• Active speakers and Subwoofers• Professional Audio/Public Address systems • Home Theatre amplifiers/receivers • Powerful Car-Audio systems• High-end audio power amplifier systemsTrue high-end performance is achieved by the patented ICEpower ® Analog Technology based on proprietary COM modulation and MECC control techniques.Performance features • 50W @ 0.01% THD+N 1kHz, 2.7Ω • Peak output current > 25A • 112dBA dynamic range• THD = 0.0009% @ 100mW, 5kHz • THD+N < 0.05%, 0.1W – 170W, 4Ω • Efficiency = 93% @ 100W / 8Ω • Output impedance < 5m Ω @ 1kHz • Power Supply Rejection Ratio > 60dB • Output DC-offset < 25mVOther features• Soft clipping • Soft start-up • Stand-by• Soft mute/de-mute• Under voltage protection • Monitor output • Balanced input •Balanced outputVo+Vo-PGNDFigure 2, ICEpower250A block diagramConnection DiagramFigure 3, ICEpower250A-IC.The plug interface of the ICEpower250A modules has two industry standard connectors selected for long-term reliability. The power Molex Micro-Fit TM connector is used for power input and speaker output. The JST signal PH-connector is used for low level power supply, audio input and module control.Power Connector SpecificationPin Function Description 7, 8 PGND Power GND for the single ended power supply input Vp. 3, 4 Vp Power Supply (single) for the power stage (29V-50V). 1, 2 Vo- “Cold” balanced power output terminals. In phase with Vi -. 5, 6 Vo+ “Hot“ balanced power output terminals. In phase with Vi+.Table 1, Power Connection Specifications.Signal Connector SpecificationTable 2, Signal Connector Specification.Ordering InformationShape H ICEpower250A-HCT ICEpower250A-TCIICEpower250A-ICTable 3, Ordering Information.Absolute Maximum RatingsAbsolute maximum ratings indicate limits beyond which damage may occur.Symbol Parameter ValueUnit Vp Operating power supply level 55VVcc Positive analog supply 15 V Vss Negative analog supply –15 V Vin Maximal differential input voltage ±12 V T case Maximal case temperature 90 O C T a Max. operating ambient temperature 60 O C R th,case-a Thermal resistance, case– ambient (ICEpower250A-HC) 7 K/W R th,case-rib Thermal resistance, case – rib (ICEpower250A-IC)2 K/W T ZOBEL 1)Maximal duration of 25V RMS output @ 20kHz 30 s C L Maximal pure capacitive loading470nFTable 4, Absolute Maximum ratings. 1) RC-Zobel is designed for worst-case music loads. Long lasting continuous stress at high frequencies above 10kHz may damage the device.Electrical SpecificationsUnless otherwise specified, f=1kHz, P o=1W. t a = 25 O C.Symbol Parameter Conditions Min Typ Max Unit Vp Power Supply Operation 29 48 50 V Vcc Positive analog supply Operation 10 12 15 V Vss Negative analog supply Operation -10 -12 -15 V P O Output power @ 0.09%THD+N 10Hz < f < 20kHz (AES17 measurement filter) 2) R L = 2.7Ω, Vp = 50V R L = 4Ω, Vp = 50V R L = 8Ω, Vp = 50V250 210 110 WTHD+N THD+N in 4Ω (AES17 measurementfilter)2)f = 1kHz, P O =1W 0.015 0.02 % THD+N Maximal THD+N in 4Ω (AES17measurement filter)2)10Hz < f < 20kHz 100mW < P O < 170W 0.05 0.07 % I Vp Quiescent current Vp = 48V 30 40 50 mA I Vp, standby Standby current Vp = 48V 2.5 mA I Vcc Quiescent current Vcc = 12V 110 130 160 mA I Vcc, standby Standby current Vcc = 12V 60 mA I Vss Quiescent current Vss = -12V 10 20 30 mA I Vss, standby Standby current Vss = -12V 25 mA f o Offset switching frequency Offset carrier at idle 380 440 480 kHz f S Switching frequency range Idle to full scale variation 60 480 kHzη Power stage Efficiency R L = 8Ω, P O = 100W93 % PSRR Power Supply Rejection Ratio of Vp Voltage ripple @ f = 100 – 120Hz60 dBV N,O Output referenced idle noise A-weighted 10Hz <f <20kHz 70 85 100 µV V OFF,Diff Differential offset on output terminals Terminated input ±25 mV V OFF,CM Common mode offset on output terminalsTerminated input Vp / 2 ±10% VA V Nominal Voltage Gain f = 1 kHz 27.1 27.4 27.7 dB f Frequency response 20Hz - 20kHz, All loads ±0.3 ±0.6 dB f u Upper bandwidth limit (-3dB) R L = 8Ω 70 kHz f l Lower bandwidth limit (-3dB) R L = 8Ω 4 Hz Z O Abs. output impedance f = 1kHz 5 10 m Ω Z L Load impedance range 2 4 ∞ Ω D Dynamic range A-weighted 112 dB IMD1 Intermodulation (CCIF) f = 19kHz, 20kHz, P O = 10W 0.001 0.002 % IMD2 Intermodulation (SMPTE) f = 60Hz,7kHz(1:4), P O =10W 0.01 0.02 % TIM Transient intermodulation (TIM) f 1 = 3.15kHz square, f 2 = 15kHz, P O =10W0.003 0.005 %Table 5, Electrical Specifications. 2) AES17, 22 kHz 7th order Audio Precision measurement filter is used. 7kHz corresponds to the worst-case situation where 2nd and 3rd harmonic are within the audio band.Timing SpecificationsSymbol Parameter Conditions Min Typ Max Unit200250 300 ms t sd Switching start up delay Time from all power supply 3) aregoodms500400 t pdm Output delay Time delay to signal 3) 350100ms50t md Mute delay Time delay to mute 3) 30ms400350 t dmd De-mute delay Time to demute 3) 3005 t psd Shutdown delay Supply fail or Standby pin 3) 1µsTable 6, Timing Specifications. 3) For details see Figure 13 and Figure 14.Typical Performance CharacteristicsFigure 4, Frequency response in 2.7Ω, 4Ω, 8Ω and open load. Top – amplitude. Bottom – Phase.Efficiency vs. Output PowerFigure 5, Efficiency vs. output power (8Ω).Figure 6, Efficiency vs. output power (4Ω).Figure 7, Efficiency vs. output power (2.7Ω).Harmonic Distortion & NoiseTHD + N vs. output power at 100Hz, 1kHz and 7kHz 4) (8Ω). Idle noise (16K FFT). Residual = 80µV(A).THD + N vs. output power at 100Hz, 1kHz and 7kHz 4) (4Ω). f = 5kHz. P o = 100mW. 4Ω loading. THD = 0.001%.THD + N vs. output power at 100Hz, 1kHz and 7kHz 4) (2.7Ω). f= 5kHz. P o = 1W. 4Ω loading. THD = 0.002%. Figure 8, Harmonic Distortion & Noise. 4) AES17, 22 kHz 7th order Audio Precision measurement filter is used. 7kHz corresponds to the worst-case situation where 2nd and 3rd harmonic are within the audio band.Intermodulation Distortion (CCIF, SMPTE & TIM)CCIF IMD1 vs. P O . R L = 4Ω. f1 =19kHz, f2 =20kHz. CCIF IMD analysis. R L = 4Ω, P O =10W, IMD = 0.001%.SMPTE 4:1 IMD2 vs. P O. R L = 4Ω. f1 = 7kHz, f2 = 60Hz. SMPTE 4:1 IMD analysis. R L = 4Ω, P O = 10W, IMD = 0.01%.TIM vs. output power. R L = 2.7Ω. f1 = 3.15kHz, f2 = 15kHz.TIM FFT analysis. R L = 4Ω, P O =10W.Figure 9, Intermodulation distortion.Application InformationFigure 10, Typical application.ICEpower250A is designed as a “complete” component electronically and mechanically to simplify product development. A typical ICEpower250A component application is a single channel application (e.g. an active speaker system). An example is shown in Figure 10.Input / output interfaceThe balanced input section provides signal buffering and anti-alias filtering. The balanced configuration helps to avoid hum and noise pick-up. Unbalanced input can be set applying a short between Vi- and AGND.Vi+Vi-AGNDFigure 11, Balanced input buffer / anti-aliasing filter.The anti-aliasing filter bandwidth is 100kHz and the filter characteristics are shaped to match the poweramplification section to provide an overall 70kHz power amplifier bandwidth. The input impedance of the input section is approximately 8k Ω over the audio bandwidth. This should be an acceptable loading condition for pre-amps, active crossover outputs etc.Output StageThe output stage is a bridge topology with a 2nd order filter. This leads to a balanced power output on the terminals Vo+ and Vo-. The filter design is a part of the proprietary MECC topology and has been chosen as a compromise between demodulation, efficiency and filter volume.Vo+Vo-Figure 12, Output filter section with compensating Zobel network.The essential output characteristics are:• Output impedance is below 25m Ω @20kHz.• The output residual basically consists of a single frequency component at the carrier fundamental ofapproximately 440kHz. In a standard application set-up the output characteristics lead to compliance with the EN and FCC directives.• The system bandwidth is 70kHz in 8Ω.ICEpower250A is designed to be intolerant to loading characteristics with low output impedance at allfrequencies (see Figure 4). The low output impedance/high damping factor means that the device can drive many types of loads. This goes for a wide span of resistive/inductive loads as typical speakers. Even heavilyinductive subwoofer loads are well driven by the device without any additional compensation needed. However, care should be taken in pure capacitive loads. The ICEpower250A is designed to be stable for capacitive loads up to 470nF. Higher capacitive loads may compromise stability and thus damage the device.Warning! The balanced speaker outputs are both “hot” with a common-mode DC level equal to Vp/2. Shorting one of the terminals to ground results in an over current situation. Also, balanced probes should be used for monitoring and measurements.Operational timing diagramThe power supply input pins, the Standby pin and the Mute pin, control the ICEpower250A. If the supplies are not at their minimum values the amplifier will enter standby mode. The amplifier can be forced to standby mode by pulling the standby pin low. The Mute pin will not stop the switching of the amplifier, but attenuates the output signal with 60dB, when pulled low.Mute Signal OutdmdmdFigure 13, Mute and demute timing definitions.pdmpsdFigure 14, Supply startup and shut down timing definitions.Power-up sequenceThe power supplies control power-up of the ICEpower250A. When the power supplies reaches operationalpower levels, the switching output stage is enabled with a 50% duty-cycle (zero modulation). In order to secure power supply stability before start-up, a propagation-delay of typically t sd = 250ms have been introduced.Following, the build-in mute function releases the input signal softly with a timed delay of t dmd = 350ms resulting in a controlled soft start-up sequence. Thus the total propagation-delay from power is applied, to full signal amplification is 600ms.Power down sequenceThe module will enter into standby mode if:1. One of the power supplies drops to an unacceptable level or falls out completely.2. The standby pin is pulled low.In all events, ICEpower250A will shut off instantly (1µs) by muting the signal and disabling the switching power stage. Following a power down in event (1) and (2), ICEpower250A will follow the standard power-up sequence.Mute controlThe mute function has been implemented to allow soft mute/de-mute of the module. The recommended external interface circuit for this pin can be seen on Figure 15.Control signalFigure 15, Interface and simplified internal circuit for the MUTE pin.Timing specifications are only valid with the shown interface.Standby controlThe Standby pin can be used to put the module in a low power consumption mode. The standby mode isobtained by pulling the standby pin low. This function allows quick shutdown of the module and can be used for protection of the module.The recommended external circuit is shown in Figure 16. The timing specifications are only valid with the interface circuit shown in Figure 16.Control signalFigure 16, Interface and simplified internal circuit for STANDBY pin.Monitor outputThe monitor output has been implemented as an attenuated ground referenced version of the balanced output signal. The internal output circuit of this output is shown in Figure 17.MonitorFigure 17, Internal circuitry of the monitor output.The bandwidth for the monitor output is limited to 45kHz.Thermal designThermal design is generally a huge concern in power amplifier systems. Inefficient linear designs are generallyequipped with extensive heat sinks to keep the transistor junction temperature down. ICEpower250A is based on very efficient ICEpower Analog technology providing high overall efficiency characteristics at all levels ofoperation. See efficiency vs. output power under typical performance characteristics.Part of the “component” philosophy of the A–series is to provide a self-cooled component thus eliminating the need for special attention to thermal design. The thermal resistance of the full component ICEpower250A-HC is 7K/W allowing a maximal loss of P loss≈ 7W continuous in the worst-case situation with an ambient temperature of 40 °C. This corresponds to a continuous average output loading of the device of 100W in 8Ω, which is very unlikely to occur in any practical application with music loading. It should be noticed that this is only valid for an open ventilated environment.For extreme loading requirements with continuous average loading above 60W typical or in closed environments and ambient temperatures above 40°C, we recommend the ICEpower250A-IC edition for heat-sink mounting. With R th, case-rib = 2 K/W the heat-sink can be designed using normal thermal design considerations.See more detailed application information on thermal design please see our application notes.Layout/Power SupplyICEpower250A has excellent power supply rejection relating to the use of COM modulation, and as such there are no specific requirements for power supply stabilization. ICEpower250A runs on SMPS supplies and linear non-stabilized supplies with several volts of ripple. Also, power supply bypassing and layout are not critical, and will not cause stability problems as known with linear designs.For more information regarding power supply design please see our application notes.Physical Dimensions (ICEpower250A-IC)Figure 18, Physical dimensions ICEpower250A-IC.Physical Dimensions (ICEpower250A-HC)Figure 19, Physical dimensions ICEpower250A-HC.NoticeThe data sheet contains specifications that may be subject to change without prior notice. ICEpower® is a trademark of Bang & Olufsen ICEpower a/s.Bang & Olufsen ICEpower a/s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president and general counsel of Bang & Olufsen ICEpower a/s. As used herein:Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labelling, can be reasonably expected to result in a significant injury to the user.A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.。