We use the part in our application to drive a contactor coil (Gigavac 352RPB). The lowside of the contactor coil is also switched with a Mosfet and there is a 33 V TVS Diode in parallel to the coil for freewheeling.
What we are seeing is, that if we try to switch on the contactor while the TPS1H100A-Q1 has package temperature above 60 °C, the part will not turn on the output. The CS Pin will be low in this case. This also happens if we replace the contactor coil with a 2k2 resistor, so that almost no current flows during turn-on. So we can't imagine how one of the two thermal protection mechanisms could be the issue. But this doesn't happen at all at normal room temperatures.
I also tried to disable the current limit by tying the CL pin to GND, but it doesn't really change anything.
What could be the issue here?
The schematics look like this:
