Invention Grant
US09596728B2 Maintaining output capacitance voltage in LED driver systems during PWM off times 有权
在PWM关闭时间期间维持LED驱动器系统中的输出电容电压

Maintaining output capacitance voltage in LED driver systems during PWM off times
Abstract:
A method and system of driving an LED load. A driver is configured to deliver a level of current indicated by a control signal to the LED load when a PWM signal is ON and stop delivering the level of current when the PWM signal is OFF. An output capacitance element is coupled across a differential output of the LED driver. A feedback path, having a store circuit, is configured to store an information indicative of a first voltage level across the output capacitance element as a stored feedback reference signal just after the PWM signal is turned OFF. The feedback path causes the voltage across the output capacitance element to be at the first voltage level just before the PWM signal is turned ON.
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