OVERCURRENT PROTECTIVE CIRCUIT AND METHOD

摘要

PROBLEM TO BE SOLVED: To provide an overcurrent protective circuit which can reduce the current to the following stage as much as possible by detecting an abnormality as quickly as possible even when the capacity of a power supply or its load is large. SOLUTION: This is an overcurrent protective circuit 4 used in a power supply which has a main power supply circuit 2 and a sub-power supply circuit 3 to output a sub-power supply voltage before the main power supply circuit 2 outputs its voltage. And it is made possible to detect the state that the main voltage Vout is rising but still lower than the reference voltage, using the rise characteristics of the reference voltage from the sub-power supply voltage and the main voltage Vout.