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BCR420UFD - LINEAR LED CONSTANT CURRENT REGULATOR

General Description

The BCR420UFD and BCR421UFD monolithically integrate transistors, 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 an external resistor up to 350mA.

Key Features

  • 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 (BCR421U).
  • VOUT.
  • 40V Supply Voltage.
  • PD up to 1.7W in U-DFN2020-6 Package.
  • 0.6mm Height for Low-Profile Edge Lighting.
  • Low-Side Control Enabling PWM Input < 25kHz (BCR421U).
  • Negative Temperature Coefficient (NTC) Reduces IOUT with Increasing Temp.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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BCR420UFD / BCR421UFD LINEAR LED CONSTANT CURRENT REGULATOR IN DFN2020-6 Description The BCR420UFD and BCR421UFD monolithically integrate transistors, 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 an 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 is < 40V. With the low-side control, the BCR421UFD has an Enable (EN) pin which can be pulse-width modulated (PWM) up to 25kHz by a microcontroller for LED dimming.