I have a board using a TPS7A33 and a TPS7A4701 to power some opamps. The input voltage is +/-34V and the output voltage is +/-32V. Somehow the TPS7A33 keeps getting damaged. The symptoms are the voltage at the FB pin changes (sometimes out of spec to -1.215V) which causes the output voltage to change. The output also begins drifting around by up to 10 mV (see scope image below).
I thought this: https://e2e.ti.com/support/power-management/f/196/p/762824/2819981 was the problem so I put a schottky diode in parallel with R52, with cathode at ground. The forum post I linked says anode to ground but I don't think this can be right because it would short out R2 due to the fact that the reference voltage is negative. After adding this diode to a working board however, I still managed to kill the TPS7A33 after a few power cycles.
Here is a screenshot of what the output looks like (AC coupled) after the damage event: