LT3743EUFD#TRPBF

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PMIC - LED Drivers

The LT3743EUFD#TRPBF is an LED driver for driving white LED back light displays in LCD TVs, monitors and projectors. This LED driver from Linear Technology offers high efficiency, low output voltage ripple, Current Matching to within 5% and various versatile features at the same time.

The LT3743EUFD#TRPBF LED driver focuses on efficient operation achieved by a variety of different features. This LED driver IC is designed with a constant frequency, current mode control architecture, which helps to reduce any switching losses as well as audible noise in the system. Additionally, this IC includes multiple control and protection features, such as an integrated over temperature protection, an undervoltage lock-out (UVLO) and an LED open circuit protection.

The LT3743EUFD#TRPBF LED driver is also capable of utilizing a wide range of power supplies. This feature enables use on both 3V & 5V systems without any changes to the components used. This allows designers to reduce the complexity & cost of power supply designs. Additionally, the LT3743EUFD#TRPBF offers a comprehensive set of features, including an adjustable switching frequency, a wide input voltage range, and a variable output current with high output current accuracy.

Working Principle.

The LT3743EUFD#TRPBF LED driver integrates a proprietary current mode control architecture. This controller operates on a fixed frequency and utilizes PWM dimming for rapid changes in light intensity. The PWM dimming is achieved with a logic input that can directly accept an external signal from an MCU or other control source. An additional feature of the LT3743EUFD#TRPBF is its high output current accuracy of up to 5%. This allows for accurate and stable lighting levels, which is important for backlighting tasks such as LCD TVs and monitors.

Additionally, this IC includes integrated protection features such as over voltage, over temperature, and a circuit fault detector. The over voltage protection senses the output voltage and shuts off the chip if the output voltage exceeds a predetermined level. The over temperature protection also is activated if the die temperature exceeds a designated level and shuts off the IC to avoid any possible damage. Finally, the circuit fault detector monitors the voltage and current to detect any open or short circuits in the LED system and shuts off the IC.

The LT3743EUFD#TRPBF LED driver from Linear Technology is designed to provide an efficient and reliable solution for LED backlighting applications. Its features such as a constant frequency, current mode control architecture combined with a wide range of different protection features allow for a robust and reliable design.

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