CPC H02M 1/44 (2013.01) [H02M 3/33507 (2013.01); H02M 1/0032 (2021.05)] | 18 Claims |
1. A controller of a switching power supply, the controller comprising:
a) a frequency-jittering control circuit configured to generate a first frequency-jittering signal and a second frequency-jittering signal;
b) wherein a jittering range of an operating frequency of a power transistor in the switching power supply is adjusted by the first frequency-jittering signal;
c) wherein a jittering amplitude of a peak value of an inductor current of the switching power supply is adjusted by the second frequency-jittering signal; and
d) wherein the frequency-jittering control circuit is enabled when a load is between no load and a preset load, such that the output power of the switching power supply is not affected by the jittering of the operating frequency.
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