The BCR 320U/BCR 420U LED driver family from Infineon is a low-cost solution for driving 0,5 W LEDs with currents from 150 mA to 250 mA. Their internal breakdown voltage is 20 V (BCR 320U) and 40 V (BCR 420U). A digital input pin (BCR 321U, BCR 421U) allows the LEDs to be dimmed via a microcontroller with frequencies up to 10 kHz. At higher temperatures, the output current is reduced by 0,2%/K as a result of the negative thermal coefficient of the IC. The devices require no external components such as inductors, capacitors or free-wheeling diodes, and provide up to 1 mW power dissipation in a small SC-74 package. Simple paralleling of drivers is possible to increase current output.
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