LM4856LQ/NOPB

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The LM4856LQ/NOPB is a stereophonic audio amplifier integrated circuit (IC) manufactured by the Texas Instruments, Inc. It is famous for its wide application field and working principle that are being used in different audio amplifiers. So what exactly is this IC and what properties does it have?

As a basic audio amplifier, the LM4856LQ/NOPB uses two power operational amplifiers to drive the load. Each operational amplifier has short-circuit, overload and over-temperature protections built-in. The IC has an adjustable static quiescent current from 10mA to 50mA, and it has a high voltage gain of 45V/V. It has a loud output power of 0.4Watts RMS for every channel at a 4Ω load. Also, it has an audio-signal-to-noise ratio of 47dB.

The LM4856LQ/NOPB can drive 8 ohm loads up to 7.5 watts and it can drive 4 ohm loads up to 10 watts. The IC has two 8-pin surface mountable packages and each package requires two pins for power supply, two pins for ground, two pins for input and two pins for output. It also has built-in thermal and short-circuit protections as well as a mute function. It is capable of driving 8 ohm loadspeakers up to 0.4W RMS at maximum volume with a higher SNR, which enables it to produce better sound quality.

The IC has broad application fields, such as automotive audio systems, portable audio systems, and home entertainment systems, speaker phones and hi-fi systems. It is commonly used in car stereos, portable audio systems, home theater systems, and other audio amplifiers. One of its key features is its ability to provide extremely low distortion and high quality sound delivery across a wide range of audio signal levels. This makes it ideal for driving medium- and small-sized loads, compared to conventional designs.

The LM4856LQ/NOPB’s working principle is based on a two-stage signal path that uses bipolar transistors operating in the common-emitter configuration. In the first stage, the signal is gain-controlled to match the preamp and source signal level. Then, the signal is amplified and transferred to the output stage. The output stage is a class-AB amplifier, which translates the signal into output current by driving a loudspeaker. The IC amplifies the signal with the help of a voltage feedback network, which helps to control the output signal level and maintains the desired current-source impedance.

In conclusion, the LM4856LQ/NOPB is a high-quality IC that is suitable for various audio amplifiers applications, such as car stereos, portable audio systems, and home theater systems. It has two power operational amplifiers, adjustable static quiescent current, a high voltage gain of 45V/V, loud output power of 0.4Watts RMS for every channel at a 4Ω load, and audio-signal-to-noise ratio of 47dB. It has built-in thermal and short-circuit protections as well as a mute function. Furthermore, it is capable of driving 8 ohm loadspeakers up to 0.4W RMS at maximum volume with a higher SNR. Its working principle is based on a two-stage signal path that uses bipolar transistors operating in the common-emitter configuration. All in all, the LM4856LQ/NOPB is an excellent audio amplifier IC with a wide range of application fields and a well-understood working principle.

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