Control circuit of audio power amplifier

The utility model discloses a control circuit of an audio power amplifier. The control circuit comprises an audio power amplifier chip and a sequential control circuit connected with the MUTE pin of the audio power amplifier chip; and the sequential control circuit is used for controlling the level changes of the MUTE pin before the voltage of the audio power amplifier chip is lower than the working voltage and allowing the audio power amplifier chip to output a mute sound. The control circuit has the technical effects that when the machine is shut down, the control circuit controls the level changes of the MUTE pin at first before the voltage of the audio power amplifier chip is lower than the working voltage to allow the audio power amplifier chip to output the mute sound, and then the shutdown is realized when the voltage of the audio power amplifier chip is lower than the working voltage. Thus, when the machine is shut down, the bubbling sound is avoided and the shutdown noise is eliminated.