Patent ID: 7064968

Claim:
A control module of a switching power supply (SPS) having normal and standby operation modes, the control module for controlling switch-on/off operations of a switching device of the SPS using a feedback voltage that is inversely proportional to an output voltage, the control module comprising: a voltage set-up unit operable to provide a first voltage used for a switch-on operation of the switching device in response to changes in the feedback voltage and a second voltage used for a switch-off operation of the switching device in response to changes in the feedback voltage, in the standby operation mode; and a switching control unit coupled to the voltage set-up unit and operable to generate a control signal, wherein the control signal is used to turn on the switching device when the first voltage is provided from the voltage set-up unit and wherein the control signal is used to turn off the switching device when the second voltage is provided from the voltage set-up unit.