Patent ID: 8169205

Claim:
A switching regulator, comprising: a) a filter network having a magnetic component and an output capacitor coupled to an output terminal, wherein an output voltage is generated at said output terminal from an input source; b) an active switch configured to connect said input source to said filter network, said active switch periodically operating between an on state and an off state over a switching period, wherein a duty cycle of said on state relative to said switching period is modulated based on a first control signal for regulation of said output voltage; c) a comparator configured to receive an output feedback signal based on said output voltage, a hysteresis signal, and a reference level, and to provide said first control signal therefrom; and d) a hysteresis programming circuit configured to receive a second control signal derived from said first control signal, and to generate said hysteresis signal, and a ramp control signal, said ramp control signal being coupled to said output feedback signal, wherein said hysteresis signal is programmed based on conditions at said input source and said output voltage to achieve a pseudo constant frequency operation, wherein said hysteresis programming circuit receives one or more signals reflecting a voltage V IN at said input source and said output voltage V OUT , to provide hysteresis that is proportional to V OUT *(1−V OUT /V IN ).