Class D 120 W audio reference design features only 0,01% distortion

26 July 2006 Analogue, Mixed Signal, LSI

A new audio reference design is available that uses International Rectifier's IRS20124S high-voltage analog IC and IRF6645 DirectFET power MOSFETs to complete a six-channel 120 W half-bridge Class D audio power amplifier that requires no heatsink.

The IRS20124S high-voltage IC incorporated in the IRAUDAMP3 reference design features an internal selectable dead-time generation circuit and is claimed to be immune to noise and supply voltage fluctuations to help achieve a total harmonic distortion (THD) of 0,01% at 60 W, 4 Ω and 94% efficiency at 120 W, 4 Ω single channel. 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 29 cm² for each two-channel control and switch function, also uses IRF6645 DirectFET power MOSFETs. The DirectFET packaging technology enhances performance by reducing lead inductance to improve switching performance and reduce EMI noise.

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