Patent ID: 6381151
Filing Date: 2002-04-30
Classification: H02M

Abstract:
A high efficiency switching controller for use in a switching power supply having a voltage source, a transformer with a primary winding coupled to the voltage source and a secondary winding, a switching transistor coupled to the primary winding, an output voltage circuit coupled to the secondary winding, a feedback circuit coupled to the output voltage circuit, the high efficiency switching controller comprising:a current control device coupled to the voltage source; a switch connected between the current control device and the output voltage circuit; an under voltage lockout regulator that controls the state of the switch based on a voltage of the output voltage circuit a source sink unit coupled to the feedback circuit; a first comparator coupled to the source/sink unit; an oscillator coupled to the first comparator; and a pulse width modulator unit that generates a gate drive signal having a duty cycle based on an output of the feedback circuit.