PWM Brightness Adjusting Circuit

Published:2011/6/28 1:59:00 Author:Michel | Keyword: PWM Brightness, Adjusting Circuit | From:SeekIC

R1 and R2 are used to adjust to 29V.This is very useful when output end occurres incident opening.Output division voltage may rise ,which causes devices damage if there is division voltage devices.C1 and R5 are used to stablize voltage feedback loop. The best way to control white LED brightness is to adjust white LED via a low frequency PWM pulse.The low frequency PWM pulse modulation method can make the white LED current keep stable current scale according to dutyfactor change and it can make LED light wavelengths keep constant in the adjustment range.PWM adjusting brightness circuit is shown as the aboved figure. Picture:PWM Brightness Adjusting Circuit



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