hi:
I designed a current mode boost converter!
But there is overshoot in vout when current limit release !
It is not easy to slove this problem use traditional soft start!
How to solve this problem!!??
THANKS!!
A good way for it is to design a soft start circuit for reference voltage. If ref voltage starts up very slowly and smoothly, there is no overshoot on output voltage.
Added after 54 seconds:
Torex (a Japanese IC company) has some ICs to suppress overshoot in this way.
If you make the reference voltage starting up very slowly (>1mS), you don't need to do any change for current limit. You can just design a normal current limit (same current limit level for both before start-up and after start-up). For boost, you need to avoid the fast charging for output cap if you can't turn off the PMOS path (for synchronous boost).