BCR420U Datasheet, PDF (1/12 Pages) Infineon Technologies AG – LED Driver

LED Driver
BCR420U / BCR421U
Features
• Continuous output current up to 150mA
with external resistor
• Suitable for supply voltages of 40V and above
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• 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.
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2010-01-15