Automotive LED drivers are low profile to drive low power LED strings

Automotive LED drivers available from Diodes now include the BCR4xxUQ. They simplify the driving of low power lighting, says the company.

LED technology is displacing conventional bulbs throughout the car from external lighting such as side markers, puddle lighting and sill plates, to internal lighting including dome, ambient lights, instrument clusters and button backlighting.

Each of the devices in the BCR4xxUQ series can provide a pre-set current output without the need for any external components, or deliver an adjustable constant current between 10 and 100mA (BCR401UQ, BCR402UQ, BCR405UQ), 200mA (BCR420UQ), or 350mA (BCR421UQ) with ±10 per cent tolerance.

All devices in the series are available in both industry-standard SOT26 and low-profile DFN2020 package options. The thinner 0.6mm DFN2020 is designed for edge-lighting applications in which a less intrusive, lower-height package is required.

All devices include negative temperature co-efficient, which lowers the LED driver current as the internal temperature rises, thereby protecting and extending the lifetime of the LEDs. In addition, the linear topology used means the devices exhibit virtually no EMI, claims Diodes.

With a wide operating voltage range of between 1.4 and 40V and total power dissipation of up to 1.7W, the devices can be used to drive larger strings of LEDs while still providing sufficient protection from transients in a 12V automotive supply system. The BCR421UQ can be PWM-dimmed directly from 3.3V microcontroller signal with up to 25kHz and a duty cycle of one per cent.

All members in the automotive-qualified BCR4xxUQ series of linear constant current regulators for LED lighting are available in production volumes now.

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