Patent ID: 7952893

Claim:
An integrated control circuit controlling a switching power supply, the integrated control circuit configured to control a switching device connected to a transformer primary winding to conduct a switching operation for feeding predetermined electric power from a transformer secondary winding to a load, the integrated control circuit comprising: a current limiter configured to detect a current flowing through the switching device in every switching cycle for controlling an ON-period of the switching device; a protection circuit configured to protect against an overload or an overcurrent, including to detect, from a load current flowing through the load, an overcurrent state of the load or an overloaded state of the load, and to stop the switching operation of the switching device for a predetermined period of time in response thereto; and a delay device configured to set a delay time before stopping the switching operation from a time when the overcurrent state or the overloaded state of the load is detected, wherein a first detection level is used in the current limiter; a second detection level is used in the protection circuit; and the first detection level is set to be higher than the second detection level.