| 摘要 |
A preset circuit of an audio power amplifier includes an inverter and a voltage drop device. The inverter receives an input signal to output an output signal, and includes a first switch and a second switch. The first switch is controlled with the input signal, and has a first terminal coupled to a power voltage and a second terminal for outputting the output signal. The second switch is controlled with the input signal, and has a third terminal for outputting the output signal and a fourth terminal coupled to a low reference voltage. The voltage drop device is coupled between the first terminal of the first switch and the power voltage and configured to lower the power voltage. The output signal is kept at a low level when the voltage drop device and the first switch are de-actuated due to the power voltage having a level below a first threshold.
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