LED Drivers Illuminate Automotive Apps

Diodes extends its family of automotive LED drivers with the BCR4xxUQ series that promises to simplify the driving of low-power lighting. The series is designed to provide a simple, low-profile and flexible approach to driving low-power LED strings.


Each device 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 mA and 100 mA (BCR401UQ, BCR402UQ, BCR405UQ), 200 mA (BCR420UQ), or 350 mA (BCR421UQ) with ±10% tolerance. All devices in the series are available in both SOT26 andDFN2020 package options. The thinner 0.6-mm DFN2020 is designed for edge-lighting applications. All devices include negative temperature coefficient, 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.

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With a wide operating voltage range of between 1.4V 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 a 3.3V MCU signal up to 25 kHz and with a duty cycle of 1%. For further information, visit the Diode’s LED driver page.


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