Patent ID: 9722587
Date: 2017-08-01
CPC Classifications: G11C,H02M,H03K,Y02B

Claim:
1. A power supply circuit, comprising: a first transistor connected between a high-potential terminal and a first node; a second transistor connected between a low-potential terminal and the first node; a smoothing circuit connected between the first node and the low-potential terminal; a control circuit configured to turn ON and OFF the first and second transistors alternately such that an output voltage at an output terminal connected to the smoothing circuit equals a predetermined voltage; and an overshoot suppressor configured to detect an increase in an ON-period of the second transistor when the second transistor is turned ON this time compared with an ON-period of the second transistor when the second transistor was turned ON last time, wherein the control circuit forcibly turns OFF the second transistor in response to the detection by the overshoot suppressor.