I'm trying to evaluate the ADUM347x devices using the UG-197 eval board.
In single supply mode I want to put 5V in and get a 12V output. I have used the formula Viso = Vfb x (R1+R2)/R2 to get 12V output but when I power the eval board I get 9.704Viso output !
R4 = 39K, R5 = 47K and R6 = 10K, so 12V = 1.25 x (86K=10K)/10K
What am I missing here ?
Thanks for all help received.