The dataheet rev E (May 2015) does not give worst case values for Vfb, while the formula for Vout (equation 2) does now contain Vfb instead of Vref. This means that we cannot calculate the worst case values for Vout anymore.
Question 1): what are the worst case values for Vfb?
We measure values for Vref lower tan the given minimum value, while Vfb has almost its nominal value. We have Vout set to 19.5V.
Question 2): is the measurement of Vref at the NR/SS pin dependent on the Vout setting?