We are using the TPS62080 to go from 5V input to 1.5V output for a DDR supply. Feedback resistors are 80.6K between Vout and FB and 34K from FB to GND.
When we power on ~some~ boards we see the output voltage is 3V.
We have a ferrite bead on the output of the part (after the inductor and output cap) to reduce EMI. When I short this bead the power supply regulates fine.
I checked and reduced the total capacitance on the output rail to less than 100uF. Was originally about 120uF, and is now about 40uF. This had no effect.
I used some power resistors to increase the static load on the supply (added 5 ohm resistor across 1.5V so 300mA draw) and that changed the 3V to 2.5V but didn't actually fix the problem.
There is the following case that looks similar to what I'm seeing, but there is no resolution for it:
Any help would be greatly appreciated.