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Driving RGB LEDs in projectors

Posted: 11 Jan 2011     Print Version  Bookmark and Share

Keywords:RGB LED driver  low-power projector  MAX16821 

This application note presents an RGB LED driver reference design for a low-power projector. This high-current LED driver is based on a single MAX16821 device that drives 10A to a set of RGB LEDs in step-down mode with less than 1µs turn-on/turn-off times. Only one color LED is driven at a time, with RGB colors sharing the PWM period in required proportions.

Low-power projectors use a single DLP chip to process RGB colors. Only one color illuminates the DLP at any given time. This approach enables the use of a single high-current driver with additional switches to switch between the LEDs. The result is a compact and cost-sensitive projector design. This LED driver reference design uses a single step-down converter to drive a 10A current to RGB LEDs one after the other. MOSFETS Q8, Q9, and Q10 select and route the regulated inductor current to one of the RGB LEDs, based on the PWM signals.

View the PDF document for more information.

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