UCC2897A: Some questions about the SLUA702

Part Number:UCC2897A

Hi, 

I may have some small questions about the  SLUA702, could you pls read below and try to help? 

1. On page2, Hvi(s) is used but in figure 2, it’s Hdi(s) in block. I’m afraid I’m puzzled. Any typing error here?

1. In figure 2,  Ri is used, but in Figure 3, Rs is used.

What’s definition of Rs, Ri? I guess it’s something like Rs=gain* Ri, where Ri is sense resistor. Is that correct? How much gain shall I use here for UCC2897A?

thanks,

Bell