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BCR420U & BCR421U LED Drivers


BCR420U / BCR421U are easy to use constant current sources for LEDs


Infineon's BCR420U and BCR421U provide a low-cost solution for driving 0.25 W LEDs with a typical LED current of 75 mA to 150 mA. The internal breakdown voltage is greater than 40 V, this is the maximum voltage that the LED driver IC can sustain when connected to it directly. The BCR420U and BCR421U can be operated at supply voltages of 40 V or higher by simply stacking a series of LEDs in front of the LED drivers. This results in a certain voltage drop depending on the forward voltages of the LEDs, which reduces the voltage at the supply pin of the driver below 40 V. A digital input pin (BCR421U) allows dimming via a microcontroller with frequencies of up to 10 kHz. A reduction of the output current at higher temperatures is the result of the negative thermal coefficient of 0.2 percent/K of the LED drivers. With no need for additional external components like inductors, capacitors, and free wheeling diodes, the BCR420U and BCR421U LED drivers are a cost-efficient and PCB-area saving solution for driving 0.25 W LEDs. Datasheet Infineon Technologies' LED Driver

Features
  • Continuous output current up to 150 mA with external resistor
  • Suitable for supply voltages of 40 V and above
  • Low side current control, µC compatible PWM input (BCR421U) up to 10 kHz
  • Up to 1 W power dissipation in a small
    SC74 package
  • Negative thermal coefficient reduces output current at higher temperatures
  • Easy paralleling of drivers to increase current
  • Pb-free (RoHS compliant) package
  • Automotive qualified according AEC Q101

Applications
  • Architectural LED lighting
  • Channel letters for advertising, LED strips for decorative lighting
  • Retail lighting in fridge, freezer case, and
    vending machines
  • Emergency lighting (e.g. steps lighting, exit way signs, etc.)
  • Ship, train, and aircraft interior illumination

Digi-Key P/N Manufacturer P/N Description
BCR 420U E6327INCT-ND BCR 420U E6327 IC LED DRIVER LINEAR SC74
BCR 421U E6327INCT-ND BCR 421U E6327 IC LED DRIVER LINEAR SC74
Available in Tape & Reel (TR-ND), Cut Tape (CT-ND), and custom Digi-Reel® (DKR-ND)