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The BCR420U/BCR421U monolithically integrates a transistor, diodes and resistors to function as a Constant Current Regulator (CCR) for linear LED driving. The device regulates with a preset 10mA nominal that can be adjusted with external resistor up to 350mA. It is designed for driving 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 multiple applications, as long as the maximum supply voltage to the device < 40V.
With the low-side control, the BCR421U has an Enable (EN) pin which can be pulse-width modulated (PWM) up to 10 kHz by a micro controller for LED dimming.
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:
Automotive Interior Lighting
Signage, Advertising, Decorative and Architectural Lighting
Retail Lighting in Fridges, Freezer Cases and Vending Machines
LED Constant Current Regulator using NPN Emitter-Follower with Emitter Resistor to Current Limit
Iout = 10mA ± 10% Constant Current (Preset)
Iout up to 350mA adjustable with an External Resistor
Vout = 40V Supply Voltage
Pd up to 1W in SOT26 (SC-74)
Negative temperature coefficient (NTC) reduces IOUT with increasing temperature
Parallel Devices to Increase Regulated Current
Totally Lead-Free & Fully RoHS Compliant
Halogen and Antimony Free. “Green” Device
Qualified to AEC-Q101 Standards for High Reliability
Qualification of Internal "Diodes Technology (Cheng Du) Company Limited" (CAT) as an Additional Assembly & Test Site Using Copper or Palladium Coated Copper Bond Wire with Standardization of Assembly Bill of Materials, Or as an Additional Wafer Plating, Back Grinding and Back Metal Process Source, and Qualification of Additional Wafer Source for Select Discrete Products.