The BCR402UW6Q monolithically integrates a transistor, diodes and resistors to function as a Constant Current Regulator (CCR) for LED driving. The device regulates with a preset 20mA nominal that can be adjusted with external resistor up to 65mA. It is designed for driving 0.25W LEDs in strings and will reduce current at increasing temperatures to self-protect. Operating as a series linear CCR for LED string current control it can be used in applications with supply voltages up to 40V.
With no need for additional external components, this CCR is fully integrated into a SOT26 minimizing PCB area and component count.
Constant current regulation (CCR) in:
Signage, advertising, decorative and architectural lighting
Retail lighting in fridge, freezer case and vending machines
LED Constant Current Regulator Using PNP Emitter-Follower with Emitter Resistor to Current Limit
IOUT = 20mA ± 10% constant current (Preset)
IOUT up to 65mA adjustable with an external resistor
VOUT = 40V Supply Voltage
PD up to 750mW in SOT26
Negative temperature coefficient (NTC) reduces IOUT with increasing temperature