A TRIAC dimmable driver design for high dimmer compatibility in low power LED lighting

LED lighting driver design in TRIAC dimming application has been faced with the difficulties of dimmer compatibility due to low LED power. The LED current dimming is basically controlled by primary side regulation with feedback modulation in the proposed TRIAC dimmable driver. With system compactness and better dimmable compatibility, passive bleeder is designed to stabilize TRIAC turn-on and turn-off operation. Filter discharger is also introduced to keep uniformity of dimmer output voltage to remove visible flicker. The proposed TRIAC dimmable LED driver has been experimentally verified in 3W LED lamp system.