BCR421U RoHS

Features

• Continuous output current up to 150mA with external resistor

• Suitable for supply voltages of 40V and above

• Low side current control, μC compatible

  PWM input (BCR421U) up to 10kHz

• Up to 1W 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

General Description

The BCR420U/BCR421U provide a low-cost solution for driving 0.25W LEDs with a typical

LED current ILED of 75mA to 150mA. Internal breakdown voltage is >40V, this is the

maximum voltage that the LED driver IC can sustain when connected to it directly.

The BCR420U/BCR421U can be operated at supply voltages of 40V or higher, by simply

stacking a series of LEDs in front of the LED drivers, resulting in a certain voltage drop

depending on the forward voltages of the LEDs, reducing the voltage at the supply pin

of the driver below 40V. 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% /K. of the LED drivers.

With no need for additional external components like inductors, capacitors and

free wheeling diodes, the BCR420U/BCR421U LED drivers are a cost-efficient and

PCB-area saving solution for driving 0.25W LEDs.