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IR announces class D, six channel audio ref design

Posted: 10 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 analogue IC and IRF6645 DirectFET power MOSFETs.

"By optimising 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 per cent at 60W, 4 ΩsΩ; and 94 per cent efficiency at 120W at 4 ΩsΩ, 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 utilises 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 ΩsΩ, 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 Rs.45,600.85 ($995) each. Pricing is subject to change.

- Vince Biancomano

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