Patent ID: 11909321
Assignee: ROHM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A power supply controller comprising:
a monitor voltage generation part configured to generate a monitor voltage according to a primary voltage of a transformer that forms an insulated switching power supply;
a sample/hold part configured to sample/hold the monitor voltage and output a feedback voltage;
a controller configured to turn on/off a primary current of the transformer by a fixed on-time method according to the feedback voltage; and
a comparator configured to compare the feedback voltage with a slope-shaped reference voltage to generate a set signal,
wherein the sample/hold part samples/holds the primary voltage at a plurality of different timings and outputs one of a plurality of hold values as the feedback voltage, and
wherein the controller determines on-timing of the primary current according to the set signal.