Richtek Technology Corporation

Yi-Hua Chang

Hsing-Shen Huang

Chun-Wen Wang

A dimming circuit is configured to generate a dimming signal to control a brightness of a light emitting device. The brightness is correlated with a duty ratio of the dimming signal. The dimming circuit is configured to count a conduction time of the dimming signal according to a programmable period count code and a programmable brightness code, based upon a fundamental frequency, wherein when the conduction time is less than a conduction time lower limit, based upon a down conversion ratio, the dimming circuit reduces a frequency of the dimming signal according to the programmable period count code and the programmable brightness code, wherein the down conversion ratio is greater than 1 to an extent where a dimming conduction time is greater than or equal to a conduction time lower threshold.

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Pingtung, Taiwan

Yi-Hua Chang