Patent ID: 8749216

Claim:
A converter, comprising: an input terminal, coupled to an input voltage; an output terminal, configured to provide an output voltage; a feedback circuit configured to sense the output voltage of the converter and configured to provide a sensed output voltage, the sensed output voltage is configured to generate a feedback signal; an operating circuit having a first input and a second input, and an output, wherein the first input of the operating circuit is coupled to receive a compensation signal adjusted by a digital controller, wherein the output of the operating circuit is configured to provide a compensated signal as the feedback signal or as a reference signal; a comparison circuit having a first input and a second input, and an output, wherein the first input of the comparison circuit is coupled to the output of the operating circuit, and the comparison circuit is configured to provide a comparison signal at the output of the comparison circuit, the comparison signal is generated by comparing the feedback signal with the reference signal; a timer, having an output configured to provide an on-time signal with a constant time; a driving circuit having a first input and a second input, and having an output, wherein the first input of the driving circuit is coupled to the output of the comparison circuit and the second input of the driving circuit is coupled to the output of the timer; and a switching circuit, coupled to the input terminal of the converter and the output of the driving circuit, the switching circuit is configured to be turned ON according to the output of the comparison circuit, and to be turned OFF according to a falling edge of the on-time signal, the switching circuit is configured to regulate the output voltage of the converter based on the input voltage of the converter and switching action of the switching circuit; and wherein the compensation signal is configured to rise up to a predetermined amplitude when the feedback signal is less than the reference signal, and after the switching circuit is configured to be turned OFF, the compensation signal is configured to ramp down at a falling rate; and the digital controller is configured to adjust the predetermined amplitude and the falling rate of the compensation signal.