LM4819 audio power amplifier circuit diagram

As shown in the figure, this is the audio power amplifier circuit of LM4819. After the audio signal is input, it is coupled to the inverting input terminal (pin 4) of the amplifier through Ci and Ri, while the inverting input terminal (pin 3) of the amplifier is AC grounded, and the amplified signal is output from pins 5 and 8. A load such as a speaker is connected between pins 5 and 8 to form an inverting power amplifier circuit. In order to avoid shutdown current, the Shutdown pin (pin 1) should be connected to VDD (shutdown state) or grounded (full power working state), and the Shutdown pin cannot be floating).