Philips has introduced a Class-D audio amplifier aimed at LCD TVs, a partner for its TDA15500 and TDA15600 single-chip TV circuits.

The TDA8931T is a 1x20WRMS device which runs off a single 12V to 35V supply, or ±6V to ±17.5V.

In single supply mode, a charger circuit brings the 1,000µF (for 40Hz into 4Ohms) output decoupling capacitor up to VSUPPLY/2 before the amplifier engages to avoid thumps.

Distortion is typically 0.02 per cent at 1W 1kHz out. One per cent distortion at 17W is achievable into 8Ohms.

Quiescent current at the typical operating voltage of 22V (±11V) is 20mA. Maximum power is 22W into 4Ohms at 22V supply.

www.semiconductors.philips.com