Patent ID: 11870363
Assignee: CYPRESS SEMICONDUCTOR CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A secondary side controller for a flyback converter, the secondary side controller comprising an integrated circuit (IC) that comprises:
a synchronous rectifier (SR) sense pin coupled to a drain of an SR transistor on a secondary side of the flyback converter;
a capacitor having a first side coupled to the SR sense pin, the capacitor to charge or discharge responsive to a voltage sensed at the SR sense pin;
a diode-connected transistor coupled between a second side of the capacitor and ground;
a first current mirror coupled to the diode-connected transistor and configured to receive, as input current, a reference current from a variable current source; and
a peak detect transistor coupled to the diode-connected transistor and to an output of the first current mirror, wherein the peak detect transistor is to output a peak detection signal in response to detecting current from the capacitor drop below the reference current.