Patent ID: 8779738

Claim:
A control circuit for controlling at least one switching transistor of a switching regulator receiving an input voltage and generating an output voltage, comprising: a first resistor and a second resistor for dividing the output voltage of the switching regulator; a comparator having a first polarity input terminal input a divided output voltage divided by the first resistor and the second resistor; a driver for controlling the switching transistor according to an output pulse of the comparator; a feedback circuit for outputting a switching signal to the first polarity input terminal of the comparator according to the output pulse, the switching signal for switching two voltage levels between the input voltage and a fixed voltage; and an error amplifier for amplifying an error between the divided output voltage divided by the first resistor and the second resistor and a first reference voltage and generating a second reference voltage to output to a second polarity input terminal of the comparator.