Texas Instruments: LED Streetlight Demo

Tags:: PR788 Street Lighting Reference Design UCC28810/11 LEDs Led

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By: TInergy
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Updated: 11-Feb-09
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Added: 26-Nov-08

The PR788 shown in this short clip is a 100W offline AC to DC LED current driver with power factor correction. This design is a two stage converter design with a universal input* boost PFC stage providing a 240V to 400V DC output and a low side buck stage providing the current source to power the LED’s. This design has been designed to support up to 30 high brightness LED’s in series up to 900mA average current, while in this demo we have used 3 strings with 30LEDs in Series, driven with a current of 300mA each. So in sum achieving the same result as with a 30LED string powered with 900mA. In addition the design incorporates interface for microprocessor control to allow for shutdown into a low power mode (<0.5W) and PWM dimming** of the LED’s.

The PR788 is as well now available as a web orderable EVM for US$49 (http://focus.ti.com/docs/toolsw/folders/print/ucc28810evm-002.html)

*90VAC-264VAC
** Supports PWM dimming frequency range of 200Hz up to 1kHz

Further information at www.ti.com/LED