The oscillogram shows that the 47uF capacitor discharged in 3ms, so I conclude that it was discharging through very little resistance so the starting current must have been large.
So you can imagine how long the capacitor 4700 uF would discharge, and even more so, for example, a battery charged with a converter.
So I wonder if my colleagues reporting damage to the converter did not turn off or turn on the converter loaded with high capacity. (this is just a guess)
In the meantime, I found a pdf for the MP2307 chip (attached)
