Patent ID: 6495995
Filing Date: 2002-12-17
Classification: H02M,Y02B

Abstract:
A controller for a multi-phase, switch mode power supply, said controller comprising:a) a multi-phase control circuit comprising a plurality of output circuits to control different phases of said switch mode power supply, each said output circuit operative to generate a switching signal to regulate a corresponding phase of said switch mode power supply, said control circuit operative to generate said switching signals in dependence on a primary clock signal in a first operating mode and to generate said switching signals in dependence on a secondary clock signal in a second operating mode; b) a feedback circuit operative in a first operating mode to generate said primary clock signal as a function of the ripple in a regulated output signal generated by said switch mode power supply; and c) a blanking circuit operative to generate said secondary clock signal as a function of said switching signals, said secondary clock signal providing a self-clocking feedback signal to said control circuit in said second operating mode.