Patent ID: 9642200
Date: 2017-05-02
CPC Classifications: H05B

Claim:
1. A light emitting diode (LED) driver circuit comprising: a control signal input configured to receive a control signal; a pulse-width modulation (PWM) input configured to receive a PWM signal; a power stage having a first input coupled to the PWM input, a second input configured to receive an operating point signal, and an output, wherein the power stage is configured to deliver a level of current indicated by the control signal, to a light emitting diode (LED) load when the PWM signal is ON and stop delivering the level of current when the PWM signal is OFF; a feedback circuit coupled between the output and the second input of the power stage, wherein the feedback circuit is configured to generate the operating point signal to cause the power stage to deliver a level of current indicated by the control signal, when the PWM signal is ON; a store and hold circuit having a first node coupled to the PWM input and a second node coupled to the second input of the power stage, wherein the store and hold circuit is configured to store an information indicative of a level of the operating point signal just after the PWM signal is turned OFF and cause the operating point signal to be at that level just before the PWM signal is turned ON.