I'm using an IGBT switch with thermal model and connected to a reference temperature (e.g. Ambient) via an RC foster network. I want the IGBT to start from higher temperature than the ref. I tried to let the "initial temperature" parameters of the Thermal capacitances in Foster as blank and initialize the IGBT temp to e.g. 125. But in the end still the IGBT temperature still starts from Ambient. Any recommendations ?