Method and apparatus for controlling adaptive charge-recovery in switching regulator

Abstract

A controller circuit of a switching regulator includes a constant on-time (COT) setting circuit and a decision circuit. The COT setting circuit adjusts a COT control setting adaptively, wherein an on-time of a high-side power switch of the switching regulator depends on the COT control setting. The decision circuit enables a control scheme of periodically triggering a regulation operation of an output voltage of the switching regulator during a period in which the COT control setting is assigned a minimum COT control value allowed by the switching regulator, wherein during the period, a turn-off time of a low-side power switch of the switching regulator depends on a comparison between a feedback voltage and a first reference voltage, where the feedback voltage is derived from the output voltage.

Dependencies are inferred from the claim text.