Power control methods and apparatus

摘要

An apparatus and method for a switching power supply (200) for providing power factor correction and an output voltage (32) to at least one LED-based light source (100) via control of a single switch (20), without requiring a voltage regulation feedback control loop associated with the at least one LED-based light source during normal operation of the LED-based light source, is disclosed. At least one controller (360) is coupled to the single switch (20) for controlling the single switch using a fixed off time (FOT) control technique.