Integrated Stereo Amplifier

The Type TDA1521 from Valvo/ Mullard is an integrated HiFi stereo power amplifier de- signed for mains fed appli- cations such as stereo TV. The device works optimally when fed from a ± 16 V supply, and delivers a maximum output power of 2 x12 W into 8 Q. The gain of the amplifiers is fixed internally at 30 dB with a spread of 0.2 dB to ensure optimum gain balance between the chan- nels. A special feature of the chip is its built-in mute circuit, which disconnects the non-inverting inputs when the supply voltage is less than ± 6 V, a level at which the amplifiers are still correctly biased. This arrange- ment ensures the absence of unwanted clicks and other noise when the amplifier is switched on or off. The TDA1521 is protected against output short circuits and thermal overloading. The SIL9 package should be bolted onto a heat- sink with a thermal resistance of no more than 3.3 K/W (RL = 8 Q; V.=± 16 V; Pa =14.6 W; Ta= 65 °C). Note that the metal tab on the chip package is in...