With specified THD+N figures of better than 0.05 per cent from 1W up to 90 per cent full power, a 500W rms into 4ohm analogue input class D reference design from Zetex is now supported with a single channel evaluation board.

In order to generate 500W into 4ohm, a bridge voltage of 70V is required.  The evaluation board uses a split rail input voltage of +/- 35V to power the output stage, with subsidiary bias voltages provided by an integral regulator daughter board.

Circuit protection is another feature of the ZXCD500MOEVAL reference design.  High-side and low-side sense circuits provide short circuit protection, DC offset detection and protection against thermal overload are also included.

Mosfets used in the class D amplifier’s H-bridge output stage are all N-channel types.   

E-mail: lcollier@zetex.com

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