MIC3291-18YML-TR Integrated Circuits (ICs)

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LED drivers have become increasingly important to the industry as they are found in virtually every lighting device, from basic task lighting to streetlights. The MIC3291 is an innovative product from Microchip that bridges the gap between design and function, providing a low-cost and efficient solution to driving LEDs. This article will discuss the application field of the MIC3291-18YML-TR and the working principle of this device.

Application Field

The MIC3291-18YML-TR is a rectified current, low-cost, 3-channel LED driver. It offers a wide range of current levels and has seven different current combinations that are designed to fit a variety of LED applications. It is particularly suited for use as an LED backlight driver in color displays, graphic displays, and small LED light engines. The MIC3291 can also be used for a variety of other applications, such as LED signs, LED projectors, LED lighting products, LCD panel backlighting, dome displays, LCD TVs, and many more.

Working Principle

The MIC3291-18YML-TR is a linear current source that drives LEDs with constant voltage. It consists of two main parts: the control circuit and the power switch circuit. The control circuit uses a single external potentiometer to adjust the output current setting. The control circuit amplifies the voltage signal from the potentiometer and creates a current sensing loop, which is used to adjust the output current, as well as the output voltage. The power switch circuit consists of two MOSFETs, which have been optimized to work with the control circuit. The MOSFETs are used to control the voltage and current of the LEDs. When the voltage drops or the current increases, the MOSFETs will adjust the output to maintain the desired current and voltage levels. The output of the MIC3291 will remain at the fixed current levels for the load, until the load changes.

Conclusion

The MIC3291-18YML-TR is a rectified current, low-cost, 3-channel LED driver. It offers a wide range of current levels and has seven different current combinations that are designed to fit a variety of LED applications. The device is comprised of two parts: the control circuit and the power switch circuit. The control circuit uses a single external potentiometer to adjust the output current setting, while the power switch circuit consists of two MOSFETs, which have been optimized to work with the control circuit. This device is particularly well-suited for LED backlight drivers in color displays, graphic displays, and small LED light engines, but can be used for a wide variety of other applications as well.

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