Integrated Driver Shrinks Class D Audio Amplifiers

by Jun Honda, International Rectifier, El Segundo, Calif., How2Power Today, Nov 24 2009

Focus:
From automotive entertainment to home theater systems, consumers are demanding more channels of high-amplitude, high-quality audio. But driving each channel individually translates into higher power consumption and the accompanying thermal challenges, as well as more components and board space. To address these issues, designers have been turning to class D audio amplifiers, which achieve efficiencies over 90%, while seeking integrated solutions to reduce parts count and board space. This feature discusses the operation and application of the IRS2093M, an audio driver chip that packs four channels of high-voltage power MOSFET drivers on the same die. As a design example, the article presents a four-channel half-bridge class D audio amp capable of up to 120 W per channel. The design uses the IRS2093M driver IC together with IRF6665 digital audio power MOSFETs and passive components. Performance results such as efficiency, THD+N versus output power, and channel separation (crosstalk) are presented.

What you’ll learn:

• How to build a compact, 4-channel Class D audio amplifier with 120 W per channel

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