Patent ID: 7447049

Claim:
A switch mode power supply (SMPS) controller for regulating the output voltage of an SMPS in response to a feedback signal from a winding of a magnetic energy storage device forming part of an output circuit of the SMPS, the SMPS controller comprising: a reference level input to receive an output reference level signal; an input to receive said feedback signal, said feedback signal being responsive to a voltage on said winding of said magnetic energy storage device; an integrator to integrate a difference between said feedback signal and a first fixed reference level signal; a first comparator to compare an output of said integrator with a second fixed reference level signal and to provide an output responsive to said comparison for regulating said SMPS output voltage; a second comparator to compare a signal derived from said feedback signal with a third reference level signal derived from said output reference level signal, at a time when said first comparator indicates that said integrator output is substantially equal to said second fixed reference level signal; and a controller output coupled to an output of said second comparator to provide a regulation signal for controlling said SMPS to regulate said SMPS output voltage.