two questions about the UCC2897A

Hello user5357005,

In answer to your first question: If you have a switching frequency of 100kHz say , then the minimum pulse width is going to be around 1uS.
So a rise time of 100nS to 200nS is not going to overly distort the minimum current sense signal.
This would correspond to an f value of one hundreth to one fifthieth of the switching frequency.
So use one hundreth of the switching frequency as a starting value

For your second question dV/dt is the downslope of the inductor ramp current.
In a buck regulator the inductor current downslope equals Vout/L.
This document explains the requirements for current mode control and it may be helpful.

Regards

John

thanks for the answer .in the first answer ，does it mean I can choose the corner frequency fF=1/100Fsw ？I don't quite understand that .