AUDIO POWER AMPLIFIER WITH NOISE PREVENTION AT TURN-ON AND TURN-OFF

摘要

An audio power amplifier (10, 20) is provided that includes circuitry to prevent popping noises when the amplifier is turned on and turned off. The amplifier can be powered with a single-ended voltage power supply, and thus may be used within systems such as personal computers. The amplifier includes a control circuit (50) that prevents the fast charging of the output AC coupling capacitor (16) when the amplifier is turned on and turned off. The control circuit controls a driver stage (20) such that the output transistors (12, 14) turn on slowly when power is first applied, and such that the output transistors turn off quickly when the supply voltage is removed.