On Wed, Dec 25, 2024 at 01:13 PM, MD MUBDIUL HASAN wrote:

..., I also need to understand this circuit can operate with over and under voltage or not. "cut off" situation is important.

I might be wrong, but it looks to me like this circuit best provides a voltage boost.  I guess there is one choice for voltage reduction.  So, it might not be a good choice for handling an over-voltage situation from the mains supply.

 

I don't understand what you mean by "cut off" situation.  What is "cut off"?

 

Andy