Mr. Papabravo You are indeed an experienced "veteran". I checked the data sheet and found that the circuit we are using in batches has the problem that the MOSFET is not fully turned on. However, this circuit was designed and customized by our department head. Once there is a problem, he must take full responsibility, but I didn’t have the courage to bring it up with him, because it would be tantamount to openly challenging his authority. I also plan to resign in the near future, and there is no need to bring it up.,XDI'm sorry for your trials and tribulations. If you choose to do things in a particular way, then there is very little I can do to help you. Even frequently used circuits and verified component parameters are subject to mistakes and oversights. It takes less time than you might imagine for checking a datasheet. I did that sort of thing for half a century and made a comfortable retirement by doing it well. I hope things go well for you.