Reference design for 500 W stereo output Class D audio amp

22 September 2004 Power Electronics / Power Management

International Rectifier has released a Class D audio amplifier reference design featuring the company's 200 V-rated IR2011S high-speed gate driver IC that drives a pair of IRFB23N15D HEXFET MOSFETs.

The IRAUDAMP1 reference design is a complete analog input, Class D audio power amplifier with 500 W + 500 W peak stereo output into four ohms. It is based on a self-oscillating PWM modulator for the lowest component count and a robust design, with protection functions and housekeeping power supplies to simplify use. This reference design is intended to demonstrate how to use the IR2011S, implement protection circuit features and design an optimum PCB layout.

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.

The IR2011 is a high- and low-side MOSFET driver IC rated at 200 V and designed for 100-1000 W Class D audio amplifier circuits. Housed in an 8-pin DIP or SO-8 package, it has a maximum ambient temperature rating of 125°C.

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