LM4879IBPX

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LM4879IBPX Application Field and Working Principle

The LM4879IBPX is a high-performance, Class AB audio amplifier from Texas Instruments. It is designed for portable and mobile applications such as portable music players and small-form-factor amplifiers. It is capable of delivering a maximum output power of up to 1.7 watts into a 4-ohm load. It operates from a single 2.7 (±2.2) to 5.5 V supply, and typically delivers 0.9 watts (1.26% THD+N) into a 4-ohm load from a 5V supply.

Device Specifications

The LM4879IBPX is a fully differential single-ended Class AB amplifier which has the following features:

• High performance audio amplifier with 0.9 watts of output power into a 4-ohm load.
• High efficiency of 90%.
• High power supply rejection ratio (PSRR) of 100dB.
• Low harmonic distortion (THD+N) of 0.0022% at 1 watt output.
• Low quiescent current of 10mA.
• Wide supply voltage range of 2.7 (±2.2) to 5.5 V.
• Low noise level of 522µVrms.
• Integrated short-circuit protection and thermal shutdown.
• Industry-standard 8-leadPDIP and 8-ball WLCSP packaging.

Application Field

The LM4879IBPX is suitable for a wide variety of portable audio applications, including portable music players, digital audio players, headphones amplifiers, speakers, sound cards, and computer Hi-Fi systems. It is also applicable for low-power home theater systems, as well as automotive audio applications.

Working Principle

The LM4879IBPX operates under the principles of Class AB audio amplification. It is designed to deliver maximum output power into a 4-ohm load, with low distortion and low noise with a high power supply rejection ratio. The device has an integrated input stage, differential outputs, and short-circuit protection.

The device consists of two differential amplifiers, one for the left and one for the right channel. The left and right signals are summed together to output the combined left and right channels. The output stage of the amplifier is controlled by a voltage-mode error amplifier which provides negative feedback to the operational amplifiers to maintain gain accuracy and stability.

The power output is controlled by a MOSFET output stage which is capable of delivering high efficiency and low distortion. The LM4879IBPX also has a thermal shutdown feature which protects the device from operating at elevated temperatures for extended periods of time.

Conclusion

The LM4879IBPX from Texas Instruments is a high-performance, Class AB audio amplifier designed for portable and mobile applications. It is capable of delivering up to 1.7 watts of maximum output power into a 4-ohm load, with high efficiency and low distortion. Its integrated input stage, differential outputs, and short-circuit protection make it suitable for a wide range of portable audio applications.

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