UC2901: How to select RC value

Hi.

You can refer to the below article. The circled R-C forms part of loop compensation and also gain adjustment. Their values depend on your other loop compensation setup. For initial design, you can just pick up something similar to the below article. After you get all loop idea then you can adjust the two to your need.

The_UC1901_Simplifies_the_Problem_of_Isolated_Feedback_in_Switching_Regulators