DIOBCR421UFD-7
Overview
The BCR421UFD-7 is a linear LED driver designed to provide a constant current for LED strings up to 350mA. It operates with a supply voltage up to 18V and supports an output voltage of up to 40V, making it suitable for driving multiple LEDs in series. The device features an integrated PWM dimming capability and a negative temperature coefficient that automatically reduces output current to protect the LEDs from thermal runaway.
Why Choose This Part
The U-DFN2020-6 package offers a very low profile of 0.6mm, saving significant vertical space in thin lighting fixtures. Its NPN emitter-follower architecture with an integrated NTC provides robust thermal protection without requiring external sensors. Additionally, the device can be easily paralleled to increase total regulated current beyond the 350mA single-channel limit.
Applications
Key Specifications
Getting Started
To implement the BCR421UFD-7, select an external REXT resistor to set the desired output current according to the datasheet formula. Connect a PWM signal to the EN pin for brightness control, ensuring the signal is within the 3.3V logic level for a typical 10mA run current. For high-power applications, ensure the thermal pad of the U-DFN2020-6 package is soldered to a large copper area to manage the heat dissipation inherent to linear regulators.
