Guru
Joined: 11/02/2018
Location: AustraliaPosts: 2398
| Posted: 05:46am 08 Jun 2024 |
Little of that surge is due to the SMPSU starting. Most of it is just charging the main filter cap. The higher supply impedance just increases the charge time, which is a good thing. Less stress on the rectifier and filter cap.
After the start voltage is reached the SMPSU runs in current limiting mode till the output caps are charged and voltage regulation takes over.