Patent ID: 8659282

Claim:
A controlling method for a switching regulator, the method comprising: a) detecting an output voltage and an inductor current of said switching regulator; b) determining if there is a transient change on a load of said switching regulator by using said output voltage and a first reference voltage; c) generating a control signal using said output voltage, said inductor current, and a second reference voltage; d) controlling a switch of said switching regulator to maintain said output voltage as substantially constant when no transient change is determined on said load; e) deactivating said control signal to keep said inductor current changing along with a variation tendency of an output current of said switching regulator when a transient change is determined on said load; f) receiving, by an output voltage controller, said output voltage, and generating an error voltage signal by comparing said output voltage against said second reference voltage; g) receiving, by an inductor current controller, an inductor current sense signal and said error voltage signal; and h) generating, by a constant time generator, a constant time signal when there is no transient change on said load, said constant time signal being generated earlier than in normal operation when there is a transient change on said load.