500 W Class D audio amplifier reference design

9 February 2005 Analogue, Mixed Signal, LSI

International Rectifier's new Class D audio amplifier reference design is a complete and robust solution for designers looking to move up to the performance potential of a Class D audio amplifier in a smaller footprint. The IRAUDAMP1 features the 200 V-rated IR2011S high-speed gate driver IC, which drives a pair of IRFB23N15D HEXFET MOSFETs for each channel in the power stage to provide the amplified audio PWM (pulse width modulated) waveform.

The reference design is a complete analog input, Class D audio power amplifier with 500 W + 500 W peak stereo output into 4 Ω. The IRAUDAMP1 is based on a self-oscillating PWM modulator for low component count and robust design, with protection functions and housekeeping power supplies to simplify use.

Performance highlights include: THD+N=0,008% @ 1 kHz, 100 W, 4 Ω; high efficiency 93% @ 350 W, 1 kHz, 4 Ω; wide operating supply voltage range ±25-60 V.

Protection circuits include over-voltage and over-current protection. In addition, DC voltage output protection prevents speaker damage from DC current.

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