Patent ID: 6304066
Filing Date: 2001-10-16
Classification: H02M,Y02B

Abstract:
A circuit for controlling a switching voltage regulator, the regulator having (1) a switch coupled to receive an input voltage and including a pair of synchronously switched switching transistors and (2) an output for supplying current at a regulated voltage to a load which includes an output capacitor, the circuit comprising:a first circuit for monitoring the output to generate a first feedback signal;a second circuit for generating a first control signal during a first state of circuit operation, the first control signal being responsive to the first feedback signal to vary the duty cycle of the switching transistors to maintain the output at the regulated voltage; anda third circuit for generating a second control signal during a second state of circuit operation to cause both switching transistors to be simultaneously OFF for a period of time longer than a switching cycle of the switching transistors, during which period of time the output capacitor maintains the output substantially at the regulated voltage.