Patent ID: 7671573

Claim:
A circuit for regulation, comprising: a regulator controller that is arranged control conversion an input voltage into an output voltage such that the output voltage is regulated, wherein the regulator controller includes: a first comparator that is arranged to compare a reference signal with a feedback signal, wherein the feedback signal is based, at least in part, on the output voltage; and an on-timer that is arranged to provide an on-timer output signal such that the on-timer reset signal is based, at least in part, on the first comparator output signal, wherein the on-timer includes: an adjustable voltage source that is arranged to provide a first comparison voltage at a first comparison voltage node such that the first comparison voltage is based, in part, on at least one of the output voltage or the input voltage; an adjustable current source that is coupled to a capacitor node, wherein the adjustable current source is arranged to provide a first current to the capacitor node such that the first current is based, in part, on at least one of the output voltage or the input voltage such that a second comparison voltage is provided at the capacitor node; and a second comparator that is arranged to compare the first comparison voltage with the second comparison voltage to provide a second comparator output signal, wherein the on-timer output signal is based, at least in part, on the second comparator output signal; and wherein the adjustable voltage source and adjustable current source are arranged to be adjusted based on the output voltage and the input voltage such that, during continuous conduction mode operation, at least while an on time of the regulator controller output signal is above a pre-determined minimum on time, a frequency of the regulator controller output signal is maintained at a substantially constant frequency.