CPC H02M 1/36 (2013.01) [H02M 3/156 (2013.01)] | 16 Claims |
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.
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