LM4860M

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The LM4860M is an audio amplifier application found in a variety of devices from home theater systems to car audio systems. It is a monolithic integrated circuit designed for use in audio power amplifiers. It provides an efficient way to provide amplification with up to 1.7 watts per channel of output power. The LM4860M is a dual low voltage audio amplifier that can be configured in either a bridge-tied load (BTL) or a stereo configuration. It is designed to reduce the overall number of external components required and to reduce the power supply voltage, making it an ideal choice for cost-sensitive systems.

The LM4860M features an internal current sense and thermal overload protection that reduces external component count. It includes a mute input to prevent clicks and pops during system power-up and power-down. For systems that require a low amount of output power, the LM4860M is able to provide it without the biasing and speaker matching networks required for some other audio amplifiers. It provides both gain adjust and shutdown control.

Its non-inverting amplifier configuration, using two-stage cascode architecture, gives the LM4860M a wide-ranging frequency response, making it suitable for both voice and music audio amplification. A low-noise input stage and high-speed transient response make it ideal for challenging audio applications. It also has low distortion and wide dynamic range, allowing for the reproduction of a wide range of musical tones and nuances. The LM4860M includes an output attenuation circuit that provides adjustment of the gain level of the amplifier.

The working principle of the LM4860M is based on the supply voltage, VCC, and its output voltage, VOUT. It is a two-stage amplifier circuit, employing a current-folding amplifier stage and a power stage. The current folding amplifier stage consists of two cross-coupled p-channel JFETs, a bias current-controlling N-channel MOSFET, and a bias voltage-controlling transistor. This stage provides an overall gain determimed by the bias current and bias voltage, which is adjusted by the gain adjust pin.

The output stage is a class-AB amplifier consisting of two N-channel MOSFETs. This stage gives the amplifier its power output and high-frequency cutoff, set by the class-AB bias circuitry and the current-sense resistor. The output transistors provide improved linearity and distortion reduction. The outputs of the amplifier stage are fed into the bridge-tied load (BTL) output stage. Here, the outputs and outputs of the amplifier are connected to opposite terminals of the speaker.

The LM4860M has a built-in mute circuit in order to prevent clicks or pops when the system is powered on or off. This mute circuit can be enabled by connecting the mute pin to a low voltage, or using an external switch. The mute circuit allows for a low-noise start up and shut down without having to add any external components.

The LM4860M is a versatile and efficient audio amplifier that can be used for a variety of applications. Its efficient power capabilities and low power supply voltage requirements make it ideal for cost-sensitive audio systems. It features a low-noise input stage, wide-ranging frequency response, high-speed transient response and low distortion output. It also includes a mute circuit and gain adjustment control, making it an ideal choice for audio amplifiers.

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