Digital control method for low output dimming of light emitting diode (LED) drivers

摘要

A method for mitigating visual fluctuation of light output at low pulse width modulation levels is disclosed. The method comprises at least the step of comparing the percent change of a previously applied input voltage value to the pulse width modulation output.

主权项

1. A method for mitigating visual fluctuation comprising:
measuring an input voltage value across input/output pins of a microcontroller; determining a reference voltage (VR) as a function of an input voltage (Vin) and a power supply voltage (VDD); calculating a percent change between the measured input voltage value and a reference pulse width modulation value; and generating an error rejection code to ignore the measured input voltage value when the percent change is determined within a predetermined range.