Class D amplifiers provide high efficiency for audio systems.(EDN Design Feature)

EDN | May 25, 1995| | Copyright

Advances in MOSFET technology and integrated half- and full-bridge predrivers now make class D amplifiers a practical alternative to linear amplifiers in many applications. The biggest benefit compared to more traditional amplifier topologies is high efficiency.

Many engineers are familiar with motor-control circuits that pulse-width-modulate a voltage to control both the direction and speed of a dc motor. You can extend this concept to an audio amplifier by replacing the motor load with a lowpass filter and a speaker and by using an audio input as the control signal. ...

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