LM4871M

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LM4871M application field and working principle

Amplifier is a kind of device that make the current or voltage has been increased, LM4871M is the special type of amplifier, it’s known as audio amplifier. It’s uses the concept of class AB design which will allow it to still achieve high efficiency while still allowing for the high output of power without any distortion. It is mainly used for the portable audio equipment, MP3 players, smart phones, tablets, and other audio systems.

Application field

The LM4871MM is particularly well suited for providing audio signals to powerful speaker systems due to its high current drive capabilities and low distortion. It’s also have the huge output power even its input signal is low, which will produce clear and up to 6-Watt audio outputs from a 3V single-supply. Other than that, it also used for system where space is at a premium and maximum efficiency is required, such as portable audio devices, providing stereo signals for small to mid size speakers.

Working principle

LM4871MM works by using a class AB design, which helps maximize output power while preventing distortion. It also utilizes a two-stage architecture, which allows the amplifier to produce power more efficiently while still maintaining a low THD (Total Harmonic Distortion) value of 0.1%. The amplifier is also equipped with an integrated feedback network, allowing it to accurately adjust the output power levels to match the demand of the speaker system.

The LM4871M consist of two amplifier stages and a single feedback network. The first amplifier stage is the pre-driver stage, this stage is responsible for amplifying the small audio signals from the device into larger signals, this is done by using a non-inverting amplifier. The second stage is the output stage, which is responsible for increasing the signal amplitude further to produce the desired audio output. The distortion level of this stage is further reduced by the feedback network, which allows for better control over the output signal.

The LM4871M also includes a slew rate control feature, this feature allows the amplifier to have a faster output settling time, thus reducing interference from transient signals, while also preventing excessive noise from being output. This feature also helps reduce the THD of the amplifier as it is able to manage and reduce the various harmonics generated by the output of the amplifier.

Conclusion

The LM4871M is an audiophile amplifier tailored for portability and maximum efficiency. It\'s integreated feedback architecture and slew rate control feature make it a great choice for portable audio applications, where space is limited and low distortion require. With its capability to drive high power and low THD, it offers great performance for audio equipment.

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