Patent ID: 8319444
Filing Date: 2012-11-27
Classification: H05B,Y02B

Abstract:
1. A tail-less LED control circuit, comprising: a power supply stage having an output terminal which provides electrical power to an LED circuit; an output capacitor coupled to the output terminal; an LED driver circuit coupled to the power supply stage for controlling the power supply stage to provide the electrical power to the LED circuit, the LED driver circuit receiving a PWM dimming signal for adjusting brightness of the LED circuit; and a MOSFET switch coupled to the output capacitor in series, the MOSFET switch switching synchronously with the PWM dimming signal, such that there is no substantial current through the LED circuit when the MOSFET switch is OFF to alleviate LED afterglow, wherein the MOSFET switch includes a body diode having an anode-cathode direction against a discharge direction of the output capacitor.