Patent ID: 8880969

Claim:
A controller used in a switching converter, wherein the switching converter comprises a switching circuit having at least one switch, the controller comprises: an error amplifying circuit configured to generate a compensation signal based on comparing a feedback signal with a reference signal, wherein the feedback signal is representative of the output voltage of the switching circuit; a logic circuit coupled to the switching circuit and the error amplifying circuit, wherein based on the compensation signal, the logic circuit generates a control signal having periodical switching pulses to control the ON and OFF switching of the at least one switch; a ramp signal generator configured to generate a ramp signal; and a pulse skipping circuit coupled to the error amplifying circuit and the ramp signal generator, wherein the pulse skipping circuit generates a pulse skipping signal based on the compensation signal, the ramp signal and a threshold voltage; wherein the logic circuit receives the pulse skipping signal and skips one or more switching pulses of the control signal in accordance with the pulse skipping signal.