Patent ID: 11942863
Assignee: ROHM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A switching power supply comprising:
a switching output stage configured to generate an output voltage by rectifying and smoothing a switching voltage that is pulse-driven as an output transistor is turned on and off;
a discharge circuit configured to discharge the output voltage when the output voltage remains above a target value for a predetermined time;
an error amplifier circuit configured to receive a feedback voltage commensurate with the output voltage to generate an error voltage;
an oscillation circuit configured to generate an on signal at a predetermined switching frequency;
a slope voltage generation circuit configured to generate a slope voltage in synchronization with the on signal;
a comparison circuit configured to compare the error voltage with the slope voltage to generate an off signal;
a logic circuit configured to generate an on/off control signal in accordance with the on signal and the off signal; and
a driver circuit configured to drive the switching output stage in accordance with the on/off control signal, wherein
the logic circuit is configured to control the discharge circuit such that the discharge circuit discharges the output voltage when the off signal remains for the predetermined time at a level corresponding to an off state.