Electromagnetic Immunity of the Overtemperature Protection of Smart Power High Side Switches

In this study, we investigate how combined effects of overtemperature and electromagnetic interference (EMI) impact automotive smart power high-side switches. We focus on the overtemperature protection function and evaluate its electromagnetic immunity using both measurements and simulations. We modify the direct power injection (DPI) characterization method by adding a heating element. By comparing real-world measurements with simulation results, we identify weak blocks in the circuit. The EMI robust comparator design is found to be essential for the reliable operation of the thermal protection function during disturbance injection.