We are using an STM32H743ZI in our application and just got the first prototypes. I was using a current limited power supply for initial test to protect the circuitry, however, something has caused two micros to fail so far after only a few power on cycles. I have subsequently discovered that limiting the power supply current was actually causing the 3V3 regulator to continually drop out and restart. See below for a plot - yellow is the 3V3 rail.
However, I'm not sure how this could kill the processor (both units have failed short to GND and are unrecoverable). There is nothing in the Errata to suggest sensitivity. Has anyone else experienced this phenomenon? What can be done to protect the device if the rail suddenly drops out? I would expect the Brown out detect to protect the device?
