DC/DC converter

摘要

Provided is a DC/DC converter that is capable of performing stable control without being affected by noise from an output voltage and without any malfunction and is capable of operating at a relatively constant frequency. The DC/DC converter includes an ON-timer circuit configured to input a control signal, which is synchronized with a signal input to a gate of an output transistor, and output an ON-time signal. The ON-timer circuit includes: a ripple generation circuit configured to generate and output a ripple component based on the control signal; an averaging circuit configured to output a signal obtained by averaging the ripple component; and a timer circuit configured to generate and output the ON-time signal based on the signal of the averaging circuit and the control signal.

主权项

1. A DC/DC converter, comprising:
a first comparator configured to output a difference between a voltage obtained by adding a pseudo ripple component corresponding to an output voltage output from an output transistor and a voltage corresponding to the output voltage to each other, and a voltage obtained by adding the pseudo ripple component and a reference voltage to each other; an ON-timer circuit configured to input a control signal, which is synchronized with a signal input to a gate of the output transistor, and output an ON-time signal; a flip-flop circuit configured to input an ON-time signal of the ON-timer circuit and an output signal of the first comparator; and a drive circuit configured to input an output signal of the flip-flop circuit to control the output transistor, the ON-timer circuit comprising:
a ripple generation circuit configured to generate and outputa ripple component based on the control signal; an averaging circuit configured to output a signal obtained by averaging the ripple component; anda timer circuit configured to generate and output the ON-time signal based on the signal of the averaging circuit and the control signal.