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Optoelectronics/Displays  

LED driver design for automotive rear lighting

Posted: 23 Jul 2010     Print Version  Bookmark and Share

Keywords:LED driver  automotive lighting  MAX16804 HB LED 

For many automobiles, the same set of LEDs illuminates both tail lights and brake lights. The LEDs must therefore operate at two different brightness levels: full brightness for braking and 10 per cent to 25 per cent of that brightness (dimmed) for the tail lights. Dimming is best achieved with PWM, which maintains the LED's colour spectrum over its brightness range. Moreover, an LED-driver IC that generates an internal 200Hz ramp signal can simplify the driver design by eliminating the need for an external PWM signal.

This application note uses the MAX16804 high-brightness LED (HB LED) driver. The MAX16804 integrates a dual-mode DIM pin and on-board 200Hz ramp generator, eliminates the need for an external PWM signal and simplifies the driver design.

View the PDF document for more information.





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