The ADuM3190 seems like a good alternative to the TL431+opto solution. However, I would need to know its complete transfer function for proper use. The datasheet doesn’t explicitly include this, but based on Figure 30, the transfer function might be as follows:
\$ H(s)= \frac{H_0}{(1+\frac{s}{\omega_p1})(1+\frac{s}{\omega_p2})(1+\frac{s}{\omega_p3})} \$
Where \$ f_{p1} = 100Hz \$ , \$ f_{p2}=400kHz, f_{p3}=10MHz\$
My question is, am I interpreting this correctly?