Patent ID: 11962246
Assignee: ROHM CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A power supply control device, used for a flyback converter, the flyback converter comprising:
a switching element;
a transformer, including a primary winding, a secondary winding, and an auxiliary winding;
a rectifying element; and
a smoothing capacitor, wherein
an application end of an input voltage is connected to one end of the primary winding,
a current inflow end of the switching element is connected to another end of the primary winding, and
the rectifying element and the smoothing capacitor are disposed on a rear side of the secondary winding, wherein the power supply control device comprises:
a comparator, comparing a current sensing signal generated by I/V conversion of a primary side current flowing in the primary winding with a threshold voltage;
a switching controller, turning off the switching element according to a comparing result of the current sensing signal and the threshold voltage by the comparator;
an external terminal, connectable to a connection node of an external resistor connected in series between one end of the auxiliary winding and an application end of a ground potential;
a current detector, detecting a terminal current flowing through the external terminal; and
a threshold voltage corrector, correcting the threshold voltage based on a current detection signal of the current detector.