SWITCHING POWER SUPPLY

摘要

A switching power supply is provided in which a voltage detector is provided at the output of a power supply circuit and connected to the negative input of an error amplifier to amplify the error between detected voltage and reference voltage, the output of the amplifier is connected to the negative input of a first comparator and to the negative input of a second comparator through split resistors, a filter circuit is connected between a control switch and a synchronous switch and the output of the filter circuit is connected to the first comparator and the second comparator. This configuration constitues a control means to control the amplitude of the triangular waveform obtained through the filter circuit to be between an input level of the first comparator and an input level of the second comparator, whereby the stability of the switching power supply is ensured without lowering the frequency band of the amplified error signal and stable output ripple characteristics can be materialized. <IMAGE>