LT3746EUHH#TRPBF

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

PMIC - LED Drivers have become increasingly popular in the last decade due to their capability to efficiently and accurately stabilize the desired current in LED circuits. The LT3746EUHH#TRPBF LED driver is especially advantageous in LED applications due to its ability to regulate both forward- and reverse-current. It provides protection against overheating, overvoltage, and overcurrent while allowing independent programming and control of current levels in both directions.

Application

The LT3746EUHH#TRPBF LED driver is suitable for a variety of applications, such as streetlighting, interior lighting, automotive lighting, consumer lighting, industrial lighting, and signage and vehicle lighting. Its features enable it to regulate forward- and reverse-currents, sense the temperature of each LED, and adjust the current accordingly. Additionally, its wide operating voltage (3V to 32V) makes it suitable for applications where input voltage can vary.

Working Principle

The LT3746EUHH#TRPBF LED driver follows a closed loop control method. The control loop contains a sense resistor and an op-amp configured as a current sensing transimpedance amplifier (TIA). This senses and responds to changes in the output current and corrects it. The sense resistor is used to adjust the current programming. The output current is limited by feedback from the current limit comparator, which uses the TIA output as its reference. Temperature sensing is used to protect LED against operating at too high a temperature. Whenever temperature exceeds a particular threshold, the current is automatically reduced to a safe level.

This LED driver uses PWM dimming with a frequency range from 200 Hz to 3000 Hz. Its adjustable frequency enables it to better match the required application. Additionally, the PWM control input is provided for external control. The driver operates in either open-drain or open-collector modes.

Protection

The LT3746EUHH#TRPBF LED driver provides comprehensive protection features. It includes a total current limit that stops fault conditions due to short circuits in the LED string, as well as thermal overload protection. Additionally, it also provides reverse current protection which ensures that the forward current is maintained despite any variations in input voltage. It also has UVLO protection which prevents the LEDs from becoming over stressed in low voltage conditions.

Conclusion

The LT3746EUHH#TRPBF LED driver is an ideal solution for a variety of applications due to its comprehensive design. Its adjustable frequency PWM dimming, closed-loop control, reverse-current protection, open-collector/open drain control, and thermal protection help ensure optimal operation of LEDs. It is also quite easy to program, making it one of the most cost-effective, reliable, and feature-rich LED drivers available.

The specific data is subject to PDF, and the above content is for reference