US 12,068,683 B2
Controller of switching power supply and control method thereof
Zhan Chen, Hangzhou (CN); Jian Deng, Hangzhou (CN); and Xiaoru Xu, Hangzhou (CN)
Assigned to Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed by Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed on Jan. 27, 2022, as Appl. No. 17/585,758.
Claims priority of application No. 202110159939.2 (CN), filed on Feb. 5, 2021.
Prior Publication US 2022/0255439 A1, Aug. 11, 2022
Int. Cl. H02M 1/44 (2007.01); H02M 3/335 (2006.01); H02M 1/00 (2006.01)
CPC H02M 1/44 (2013.01) [H02M 3/33507 (2013.01); H02M 1/0032 (2021.05)] 18 Claims
OG exemplary drawing
 
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.