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Circuit characteristics:
[1]. Single row 5-pin in-line plastic package, only 5 pins.
[2]. The open loop gain can reach 90dB.
[3]. Very low distortion, 1kHz, the distortion is only 0.015% at 20W.
[4]. AC and DC short circuit protection circuit.
[5]. Over-temperature protection circuit.
[6]. The peak current is up to 4A. [7]. Extremely wide operating voltage range (16-60V).
[8]. Built-in output protection diode.
[9]. Very few external components, TO-220 package.
[10]. The output power is large, Po = 20W (RL = 4Ω). LM1875 limit parameters: LM1875 limit parameters parameter name Limit value unit Power supply voltage (Vs) 60 V Input voltage (Vin) -VEE-Vcc V Working junction temperature (Tj) +150 ℃ Storage junction temperature (Tstg) -65- + 150 ℃ Typical application circuit:
The LM1875 is an audio power amplifier circuit produced by the National Semiconductor Device Company of the United States, and adopts a V-shaped 5-pin single in-line plastic packaging structure. As shown in Figure 1, the integrated circuit can obtain an output power of 20W when the power supply voltage RL = 4Ω of ± 25V, and 30W power is obtained from an 8Ω load of the power supply of ± 30V. There are various protection circuits built in. It is widely used in car stereo receivers and recorders, medium power audio equipment, and has the characteristics of small size, large output power and low distortion.