US 12,003,170 B2
Soft-start circuit for power-up
Jianfeng Liu, Guangdong (CN); Yuquan Huang, Guangdong (CN); and Dennis Sinitsky, Guangdong (CN)
Assigned to Fremont Micro Devices Corporation, Shenzhen (CN)
Filed by Fremont Micro Devices Corporation, Guangdong (CN)
Filed on Jun. 30, 2022, as Appl. No. 17/854,049.
Claims priority of application No. 202210256141.4 (CN), filed on Mar. 15, 2022.
Prior Publication US 2023/0299663 A1, Sep. 21, 2023
Int. Cl. H02M 1/36 (2007.01); H02M 1/00 (2006.01)
CPC H02M 1/36 (2013.01) [H02M 1/0025 (2021.05)] 19 Claims
OG exemplary drawing
 
1. A soft-start circuit for power-up, comprising:
a reference value generation circuit, which is configured to output a reference value, which increases slowly, during a start-up process for power-up;
a protection threshold generation circuit, which is configured to output a protection threshold, which increases slowly, during the start-up process for power-up;
a control circuit, which is configured to control an output voltage to increase slowly along with the reference value based on the reference value, during the start-up process for power-up, and to limit an output current based on the protection threshold to limit the output voltage, during the start-up process for power-up.