Application circuit of LM1876

LM1876 is a two-channel power amplifier circuit launched by National Semiconductor Company at the end of 1995. It is specially
designed for two-channel audio, providing 20W of output power per channel and maintaining high-quality sound.
    Like every generation of LM series power amplifier circuits, LM1876 also has NS company patents. SPIKE instantaneous temperature sudden
loss protection circuit , the circuit is almost unharmed when the instantaneous temperature peaks, voltage is too high or too low, and overload occurs. In addition, the
protection circuit can monitor the safe operating area of ​​the output transistor and provide dynamic protection for the circuit.
    LMI876 has a variety of features, including progressively increasing, deleting, and muting modes: no noise when turning on/off the power; it has an
external digital logic control backup function, which can greatly reduce power consumption. In the "standby" function, the current can be reduced to 4.2mA.
    LM1876 adopts T0-220 package with output short-circuit insulation, which can be installed directly on the metal heat sink
or directly on the chassis. The two channels of
    LM 1876 are completely separated, and each channel uses independent positive and negative signals. The power supply system has positive and negative
input pins and ground respectively, which eliminates mutual interference between channels and ensures high-fidelity playback quality.