LM4875M/NOPB Integrated Circuits (ICs)

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Audio amplifiers are essential for reproducing audio signals at a desired amplifier level. The LM4875M/NOPB from Texas Instruments is a high-performance audio power amplifier designed for use in portable devices. It is designed to drive 8 ohm loudspeakers from a single supply from 1.8 V to 6 V.

Features of LM4875M/NOPB

• High output current (>100mA)
• Low quiescent current
• Class-AB operation
• Current source and voltage source
• Integrated short circuit protection
• Output will swing to within 1.3V of the power supply
• Small package SOP-8

The LM4875M/NOPB has all the features of the LM4875 but with a plastic package (SOP-8) and a lower quiescent current. It is a 1.2W audio power amplifier designed to drive 8 ohm loudspeakers from a single supply from 1.8 V to 6 V. The device is capable of delivering 1.2W of continuous output power with no more than 1%THD+N.

Application Field of LM4875M/NOPB

The LM4875M/NOPB is an ideal choice for low-voltage applications such as portable media players, iPod docking stations, speaker systems, and cellphone audio amplifiers. It is well suited for driving multi-channel audio amplifiers, speaker phones, and multimedia systems.

Working Principle of LM4875M/NOPB

The LM4875M/NOPB is a class-AB audio power amplifier that uses bipolar transistors to amplify an audio signal. It consists of two halves, a positive and a negative. The positive side is responsible for amplifying the positive portions of the input audio signal, while the negative side is responsible for amplifying the negative portions of the audio signal. The two halves are driven by separate power supply voltages, usually the same voltage.

The LM4875M/NOPB amplifies the audio signal by converting the input voltage into a corresponding current. This current is then applied to the gate of the transistors, which cause the transistors to amplify the signal. The amplified output is then fed to the load, typically an 8 ohm speaker.

The LM4875M/NOPB also has an integrated short circuit protection feature. This allows the device to protect itself from any potential damage that may arise from output devices drawing excessive current.

Conclusion

The LM4875M/NOPB is a high-performance audio power amplifier designed for use in portable devices. It is capable of delivering 1.2W of continuous output power with no more than 1%THD+N. It has all the features of the LM4875 but with a plastic package and a lower quiescent current. It is an ideal choice for low-voltage applications such as portable media players, iPod docking stations, speaker systems, and cellphone audio amplifiers.

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