Power supply circuit and method

摘要

A power supply (10) has a first transistor (20) coupled for switching a coil current (Il9) in response to a first control signal (VC1). A second transistor (30) has a body diode (32) for discharging the coil current to produce a power factor corrected signal (VPFC). A conduction channel (31) of the second transistor is responsive to a second control signal (VC3) for developing a second coil current (I61) from the power factor corrected signal to adjust an output signal of the power supply, where the second control signal commences a time interval (TD2) after the first control signal terminates.