Switching mode power supply and switching control apparatus thereof

The present invention relates to a switched mode power supply for preventing an abnormal over-current. When an abnormal over-current occurs, that is, generates and outputs a control signal for the time of initial start-up or the protection circuit to turn off the main switch by a short circuit on a circuit delay time for situations where the operation. That is, by transmitting a signal delay circuit (delay circuit) at the time of the initial start-up operation or a protective circuit situation to turn off the switching MOS transistor through a short circuit, it is possible to prevent an abnormal over-current. Accordingly, the drain of the switching MOS transistor when turned off (OFF) of the switching MOS transistor can reduce the source voltage of the breakdown voltage it can be used to lower the switching MOS transistor. SMPS, over-current, the delay time, the protection circuit, the soft-start