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Ref design optimizes six-channel, Class D audio amp

Posted: 06 Jul 2006 ?? ?Print Version ?Bookmark and Share

Keywords:International Rectifier? IRAUDAMP3? reference design? audio power amplifier? IRS20124S?

International Rectifier (IR)'s IRAUDAMP3 Class D audio reference design is a six-channel, 120W half-bridge Class D audio power amplifier. The heatsink-free design features the IRS20124S high-voltage analog IC and IRF6645 DirectFET power MOSFETs.

"By optimizing our Class D audio high-voltage ICs with benchmark power MOSFETS, the IRAUDAMP3 delivers outstanding performance benefits and size advantage to our customers," said David Tam, vice president of the energy-saving products segment.

The IRS20124S high-voltage IC features an internal selectable dead-time generation circuit and is immune to noise and supply voltage fluctuations to help achieve a total harmonic distortion of 0.01 percent at 60W, 4 ohms; and 94 percent efficiency at 120W at 4 ohms, 1kHz single-channel driven. Additionally, the IC has built-in bi-directional current sensing and an integrated shutdown function to protect the output MOSFETs when an over-current condition occurs such as a short-circuited speaker wire.

The IRAUDAMP3, which has a footprint of 4.5inches2 for each two-channel control and switch function, also utilizes IRF6645 DirectFET power MOSFETs. The DirectFET packaging technology reduces lead inductance to improve switching performance and reduce EMI noise. The higher thermal efficiency enables 120W operation into 4 ohms, eliminating the need for a heatsink to shrink circuit size, provide greater layout flexibility and reduce overall amplifier system cost.

The IRAUDAMP3 reference design is available immediately; pricing is $995 each. Pricing is subject to change.

- Vince Biancomano

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