Patent ID: 8314598
Filing Date: 2012-11-20
Classification: H02M

Abstract:
1. 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, wherein said hysteresis signal is configured to be summed with said reference level when said first control signal is active; 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 capacitively coupled to said output feedback signal, said ramp control signal being configured to operate in phase with said periodic operation of said active switch, wherein said hysteresis signal is generated based on said ramp control signal to achieve a pseudo constant frequency operation of said active switch.