BCR421UE6327 Datasheet, PDF (7/26 Pages) Infineon Technologies AG – LED Driver

1
LED Driver
BCR420U / BCR421U
LED Driver
1.1
Features
• LED drive current preset to 10 mA
• Continuous output current up to 150 mA with an external resistor
• Easy paralleling of drivers to increase current
• Supply voltage up to 40 V
• Low side current control
• Digital PWM input up to 10 kHz frequency (BCR421U)
SC74-3D
• Up to 1 W power dissipation in a small SC74 package
• Negative thermal coefficient of -0.2 %/K reduces output current at higher temperatures
• RoHS compliant (Pb-free) package
• Automotive qualified according AEC Q101
1.2
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.)
1.3
General Description
The BCR420U / BCR421U provides a low-cost solution for driving 0.25 W LEDs with a typical LED current of
75 mA to 150 mA. Internal breakdown voltage is higher than 40 V which is the maximum voltage the LED driver
can sustain when the output is directly connected to supply voltage.
The BCR420U / BCR421U can be operated with a supply voltage of more than 40 V considering the voltage drop
of the LED load which reduces the output voltage to the maximum rating of the driver.
The enable pin of BCR420U can withstand a maximum voltage of 40 V which can be increased adding a series
resistor in front of the enable pin reducing the voltage at the enable pin below 40 V.
The digital input pin of BCR421U allows dimming via a micro controller with frequencies up to 10 kHz.
A reduction of the output current at higher temperatures is the result of the negative temperature coefficient of -
0.2 %/K of the LED driver.
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 0.25 W LEDs.
Datasheet
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Revision 2.0, 2012-05-04