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公开(公告)号:US20200328689A1
公开(公告)日:2020-10-15
申请号:US16915524
申请日:2020-06-29
Applicant: CSMC TECHNOLOGIES FAB2 CO., LTD. , SOUTHEAST UNIVERSITY
Inventor: Shen XU , Wei WANG , Feng LIN , Boyong HE , Wei SU , Weifeng SUN , Longxing SHI
IPC: H02M3/335 , G01R19/165 , H03K5/24
Abstract: Provided is a dynamic control method that turns off a primary-side switching transistor when an output voltage exceeds an upper limit, and control the switching of a secondary-side synchronous rectification transistor with a fixed cycle and a fixed duty cycle. During the time that the synchronous rectification transistor is turned on, the energy of a load capacitor at the output end is extracted to the primary side, which causes the output voltage to drop rapidly and the overshoot voltage to decrease greatly.