Patent ID: 11971734
Assignee: SG MICRO CORP
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 11:
12. The control circuit according to claim 2, wherein the foldback current-limiting protection circuit comprises:
a sampling transistor, configured to obtain a current sampling signal according to the input current;
a current comparison module, configured to compare the current sampling signal with a reference signal representing the current-limiting threshold value to obtain a comparison result, and obtain a current detection signal according to that comparison result;
a foldback control module, configured to adjust the reference signal according to the output voltage;
an overcurrent protection transistor, configured to control the voltage at the control terminal of the power transistor according to the current detection signal; and
an enabling control module, configured to control an operating state of the foldback control module according to the current-limiting foldback control signal,
wherein, when the current-limiting foldback control signal is in invalid state, the enabling control module is configured to disable the foldback control module according to the current-limiting foldback control signal in invalid state.