Design of LED TRIAC Dimming Circuit Based on SSL2101T

Abstract

A Triac dimmable LED driver based on SSL2101T is designed. The driver based on flyback topology with an extra Triac dimmer and a 220V/50Hz mains input achieves flicker free, smooth dimming. The proposed driver has acceptable efficiency and power factor. The Triac dimmer and the driver are introduced and the dimming control theorem is analyzed. The design of the transformer is demonstrated in detail. Experimental results show that the full load efficiency of a demo board is 73%, power factor 0.762 and the dimming range from 0 to 347.7mA.