US 12,088,192 B2
Controller chip for a flyback converter, corresponding flyback converter and switched-mode power supply system
Pengbo Yang, Shanghai (CN); and Xiaoru Gao, Shanghai (CN)
Assigned to SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD., Shanghai (CN)
Filed by SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD., Shanghai (CN)
Filed on Sep. 12, 2022, as Appl. No. 17/942,955.
Claims priority of application No. 202111066019.2 (CN), filed on Sep. 13, 2021.
Prior Publication US 2023/0082592 A1, Mar. 16, 2023
Int. Cl. H02M 1/15 (2006.01); H02M 1/00 (2006.01); H02M 1/44 (2007.01); H02M 3/335 (2006.01)
CPC H02M 1/15 (2013.01) [H02M 1/0025 (2021.05); H02M 1/44 (2013.01); H02M 3/33523 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A controller chip for a flyback converter, wherein the controller chip comprises a feedback pin, wherein the feedback pin is connected to an isolation voltage feedback circuit that is external to the controller chip, the isolation voltage feedback circuit configured to feed back an output voltage of the flyback converter, and wherein the controller chip further comprises:
a switching module, having a first terminal connected to the feedback pin and configured to control an electric potential present at the feedback pin;
a current scaling module, having a first terminal connected to a second terminal of the switching module and configured to scale a current signal flowing through the switching module; and
a pole compensation module comprising a compensation capacitor, wherein the compensation capacitor comprises a first terminal connected to a second terminal of the current scaling module and a second terminal grounded, and wherein the pole compensation module is configured to filter a high-frequency interference in a feedback path in which the feedback pin is located.