Typical application circuit of LM4903/4905 audio power amplifier

As shown in the figure, this is a typical application circuit of the LM4903/4905 audio power amplifier (MSOP package). 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 non-inverting input terminal (pin 3) of the amplifier is connected to the ground through CB. After power amplification, it is added to the speaker in the form of a bridge output from Vo1 (pin 5) and Vo2 (pin 8). When pin 1 is at a logic low level, the amplifier is micro-powered off, and when it is at a logic high level, the amplifier works at full power.