AUDIO AMPLIFIER, AUDIO OUTPUT DEVICE AND ELECTRONIC EQUIPMENT USING THE SAME, AND PROTECTION METHOD OF AUDIO AMPLIFIER

摘要

To provide an audio amplifier in which reliability is improved.SOLUTION: An operational amplifier 110 has a push-pull type output stage 112. An overcurrent detection circuit 150 compares a source current I, flowing to a high-side transistor of the output stage, with an overcurrent threshold level, and asserts a detection signal when the source current Iexceeds the overcurrent threshold level. A protection circuit 170 becomes a first protection state when a detection signal is asserted in the first mode, and becomes a second protection state when the detection signal is asserted in the second mode.SELECTED DRAWING: Figure 5