I have recently designed the STEF01FTR into a design that sits on the main input rail. The input is specified to run from 9V-48V. As a result the output VClamp is set the 52V max by setting R122 to 560K and R126 to 10K. When our initial FAI boards arrived the STEF01 was clamping the output voltage to a maximum of 32V. I have attempted to increase the VClamp voltage by increasing R122 but that didn't seem to have any effect. I attempted to double both R122 and R126 and that also didn't have any effect. I decreased R122 to 200k and was able to drop the VClamp voltage but I can't seem to get it above 32V which seems to contradict the datasheet. Has anyone else experienced this behavior or have any ideas as to what could be causing this? This behavior is consistent across numerous boards and we are operating under very light loads currently.
