Power control circuit for setting triggering reference point of over current protection scheme

A power control circuit, comprising:

• a pin;
• a current source, electrically coupled to the pin, and providing a reference current to the pin to generate a set voltage, wherein the set voltage increases along with time alter the current source provides the reference current to the pin, and the power control circuit sample-and-holds the increasing set voltage at a predetermined time point to generate a reference voltage and activates an over current protection scheme according to the reference voltage;
• a sample-and-hold circuit, coupled to the pin, sampling the set voltage as the reference voltage at the predetermined time point, recording the reference voltage, and outputting the reference voltage;
• a current sensor, providing a sensed voltage, wherein the sensed voltage is directly proportion to an output current controlled by the power control circuit;
• and
• a comparator, coupled to the sample-and-hold circuit and the current sensor, comparing the reference voltage to the sensed voltage, and activating the over current protection scheme when the sensed voltage is higher than the reference voltage.