I’m fighting an issue with the TPS40170 part. Our prototype first used 4 of the Infineon IPB107N20NA and the prototype worked well. I then switched the FETs over to 2 of the Infineon IPW65R045C7FKSA1. The top side FET was really hot as well as the regulator. I powered down the system and powered on again but the regulator only got hot and would not control the gate of the FETs. I tried the TO-220 version of the IPB107N20NA (IPP110N20NA) but the regulator once again failed to regulate. I connected 4 of the IPP110N20NA to the circuit (2 in parallel) and found that the regulator could go up to a small output wattage (~20W) but the part was very hot and the soft start pin was ramping up and down, indicating either a high current or over temperature event. Do you have any advice? Are the FETs I’m selecting not appropriate for the device? I know the development boards use the CSD18537NQ5A FETs. I tried using 2 of the CSD19532Q5B but that too caused damage to the regulator.