POWER AMPLIFIER PROTECTION CIRCUIT

摘要

C-2667 A-21,571 POWER AMPLIFIER PROTECTION CIRCUIT A protection circuit for a bridge audio power amplifier having two pairs of output transistors coupled between positive and negative terminals of a direct current supply and providing a pair of output terminals for connection across a load. The bias of the output transistors are controlled in response to excessive current flow, a short of the output terminals to ground, excessive DC supply voltage, a short of the output terminals to the positive terminal of the DC supply, and excessive temperature to prevent permanent damage to the bridge audio power amplifier.