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Isotherm environment for placing components
Thermal
The Heat Sink absorbs the thermal losses dissipated by the components within its boundaries. At the same time it defines an isotherm environment and propagates its temperature to the components which it encloses. To change the size of a Heat Sink, select it, then drag one of its selection handles.
With the parameter Number of terminals you can add and remove thermal connectors to the heat sink in order to connect it to an external thermal network. The connectors can be dragged along the edge of the heat sink with the mouse by holding down the Shift key or using the middle mouse button. In order to remove a thermal connector, disconnect it, then reduce the Number of terminals. PLECS will not allow you to remove connected terminals.
For additional information see chapter Thermal Modeling.
If the capacitance is set to zero the heat sink must be connected to an external thermal capacitance or to a fixed temperature.