Switching regulator provided with charge-discharge circuit having overcurrent protecting function and soft-start function

摘要

A switching regulator in which an input DC voltage is chopped and then applied to drive a transformer from which an AC voltage is derived which in turn is rectified in a rectifier circuit, and the output of the rectifier circuit is compared with a first reference voltage so that an output is provided which corresponds to the difference between the two voltages compared with each other and which causes a current to be charged at a capacitor incorporated in a charge-discharge circuit which is arranged to vary the charged current, and the output of the charge-discharge circuit is compared with a second reference voltage so that a trigger signal is produced and applied to the base of a switching transistor only when the output of the charge-discharge circuit exceeds the second reference voltage.