We are operating at -65C we realise this is outside the minimum temperature of -40C. The output of the device just stays at zero volts we would like to know what is the most likely cause for this i.e would it be the current limit? or any of the other protection circuits.
The input voltage is 21V and the output set to give 11.4V. If we raise the input to 23V the regulator functions correctly
The device is not damaged by this temperature and does operate at -65C with an input voltage of 24V.