LM1875T/NOPB Integrated Circuits (ICs)

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The LM1875T/NOPB is a bridged output amplifier designed to drive loudspeakers with low distortion and high power output. It features a high-efficiency PowerWise amplifier that delivers highly efficient operation in class AB, allowing the amplifier to be extremely versatile. The power output of the LM1875T/NOPB is dependent on the input signal level and the load that is being driven. It has a wide range of applications, including audio amplifiers, home theater systems, amplifiers for public address systems, and amplifiers for car audio systems.

The LM1875T/NOPB is a single-channel amplifier, capable of providing up to 80 watts of power into a 4-Ohm load. It provides low distortion at high power levels and is capable of delivering up to 70 watts into a 4-Ohm load with less than 0.03% THD. The response of the LM1875T/NOPB is flat from 20Hz to 20kHz and its power bandwidth is 40kHz. The LM1875T/NOPB also features an output short-circuit protection circuit, which protects it against output overloads.

The LM1875T/NOPB is based on the LM1876 chipset and is designed to be used in bridged-mode audio power amplifiers. The LM1876 is a full-bridge, differential amplifier, which is used to convert a single-ended input signal into a bridged output signal. The amplifier’s differential amplifier configuration and switching arrangement provides a unity voltage gain, which offers excellent performance in terms of noise and distortion.

The LM1875T/NOPB includes an output stage featuring two complementary high current NPN transistors, capable of delivering up to 20 amps of peak current to the loudspeaker. The amplifier can drive a wide range of 4-Ohm and 8-Ohm loudspeakers, with a minimum speaker impedance of 8 ohms, which ensures the amplifier operates within its rated power specifications.

The LM1875T/NOPB also includes power-saving, low-noise, and short-circuit protection functions, which ensure the amplifier operates safely and efficiently at all times. The amplifier’s short-circuit protection circuitry will shut the amplifier down if an output overload condition is detected, allowing it to recover and resume operation once the condition is cleared.

In order to optimize the performance of the LM1875T/NOPB, it is important to match the load to the amplifier’s recommended impedance. If the load extracted from the output is less than 8 ohms, a Zobel network should be added to the output in order to prevent instability. A Zobel network is a circuit consisting of an inductor and a capacitor that is connected between the output of the amplifier and ground and provides a low impedance path for high-frequency signals, which helps to reduce distortion.

Overall, the LM1875T/NOPB is a high-efficiency audio power amplifier, capable of providing up to 80 watts of power into a 4-Ohm load with low distortion, and is an ideal choice for audio applications such as home theater systems, car audio systems, and public address systems.

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