Patent ID: 11929667
Assignee: SG MICRO CORP
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A low-voltage startup circuit of a switching converter, wherein the switching converter comprises a main switching transistor, a synchronous switching transistor, an inductor and an output capacitor, and the low-voltage startup circuit comprises:
a comparator, configured to perform a comparison between an input voltage and a reference voltage and obtain a voltage detection signal according to a result of the comparison; and
a substrate voltage control module, configured to adjust a substrate voltage of the main switching transistor according to the voltage detection signal,
wherein when the voltage detection signal indicates that the input voltage is lower than/equal to the reference voltage, the substrate voltage control module is configured to increase the substrate voltage of the main switching transistor.