Power amplifier LM1875 and applications 01

IJM18 75 is a product review of National Semiconductor Corporation (NSC). This device is a widely used final power amplifier
, suitable for power amplification situations in audio amplification, servo amplification, bridge amplification, and test systems. It has few peripheral components,
high power without distortion, and can work with both single and double power supplies. And the circuit has its own safe working area protection circuit (inductive load) for overload, overheating and reverse potential suppression
, which is an ideal application circuit port for high- and mid-range audio.
    This device has the following characteristics:
    (1) Single and double power supply, wide range Voltage range (single lzv ~ 50v or dual ±6V ~ ±50v);
    (2) Maximum undistorted power is 30W;
    (3) Low distortion output (less than 1% at 30W);
    (4) Open loop gain 90dB;
    ( .5) The quiescent current is less than 100mA;
    (6) The maximum output current is 4A;
    (7) The maximum swing rate is 8V/Ps. The appearance and pins of
    LM1875 are shown in Figure 5-22. The OCL power amplifier circuit principle is shown in Figure 5-23; the OTL power amplifier circuit principle
is shown in Figure 5-24; BTI. The power amplifier circuit principle is shown in Figure 5-25.