Hello,
In the SNVA761A application note , page no.8 , the transfer function of compensation circuit is given.
The mid band gain for above transfer function should be = (Kopto * Rup * (R1+Rfb1)) / (Ropto * Rfb1) . But in page no.14 in section 4.4.3 , the equation used for calculation of R1 is seems to be not correct (The numerator of Mid band gain is not matching , Denominator is ok). Please cross check & correct me if i am wrong..