Method and apparatus for a high voltage power supply circuit

摘要

A control circuit (115) for use in a power supply is disclosed. An example control circuit (116) according to aspects of the present invention includes a signal generator coupled to generate an output signal to control switching of a power switch (105) to be coupled to the control circuit (115). A feedback circuit is coupled to receive a feedback signal (114), which is representative of an output of the power supply during a feedback portion of an off time of the power switch. The signal generator generates the output signal in response to the feedback circuit to control a fraction of the feedback portion of the off time of the power switch (105) that the feedback signal is above a threshold and another fraction of the feedback portion of the off time of the power switch that the feedback signal is below the threshold.