We use the TPS65217C only powered from AC. After a power loss on AC the PMIC enter's FAULT state which is correct. If the AC comes back after 50msec+ it does works - PMIC comes back running as it should.
But if the AC comes back in a too short period the PMIC will not get back running (ever).
My guess is the AC edge is not detected by any reason. Note that the rise time <50msec so that shouldn't be a problem.
Below is a scope screenshot - the upper line is the AC, the lower one is the output of the PMIC on SYS1,SYS2. It can be seen that AC drops below 4.3V so the FAULT condition is fine, than AC comes back quite fast (~25msec) but the PMIC never recovers.
From AC detection point of view the short drop time is the problem (saw many 50msec deglitches in datasheet) or more the fact that the AC does not drops <100mV before it comes back?
Is there any way to go around this issue?
TY