LM4682SQ/NOPB

Introduction

The LM4682SQ/NOPB is a high fidelity audio amplifier IC from National Semiconductor. This IC is used for audio amplification and produces low distortion, high quality sound. It has a low noise, low power consumption and an input impedance that can be adjusted according to the need. It works in the power supply range from 2.5 to 6V and can be powered by any DC voltage source.

Application Fields

The LM4682SQ/NOPB is widely used in various audio systems and home theatre systems. It is typically employed as a line driver amplifier and as a power amplifier. In addition, it is also used in mobile audio applications such as headphones, personal MP3 players, portable audio systems and handheld communication devices. It can be used in various consumer electronics applications such as headphone amplifiers, powered speaker systems and consumer audio amplifiers.

Working Principle

The LM4682SQ/NOPB is a true class-AB audio amplifier. The power stage of the IC is a complementary differential amplifier with two transistors and two complementary output stages, which produces symmetrical outputs depending on the input signal. The input stage of the IC is an integrated amplifier with a high input impedance and low noise. Its output stage is a low-impedance driver which allows for a low output impedance and high current drive.

The IC performs voltage gain stage, which amplify the input signal to a usable level. This gain stage can be adjusted using external resistors to match the input signal level. The current output stage provides further amplification, producing controlled power supply voltage. The IC is also thermally protected and has an over-current protection feature which prevents the IC from overloading and damaging the audio equipment.

Conclusion

In conclusion, the LM4682SQ/NOPB is a high-fidelity audio amplifier IC widely used in consumer and professional audio applications. It is a true class-AB audio amplifier which provides low distortion, low-noise audio output. It features an input stage, voltage gain stage and a current output stage, allowing for adjustable gain setting, low output impedance and high current drive. The IC has an over-current protection feature, allowing it to protect itself from overloading.