The Quick Junction Temperature Predictor Tool

Note: This tool was introduced at FloTHERM PACK V5.1.

After a DELPHI compact model has been generated in your library, you can perform a quick prediction of junction and other nodal temperatures by entering the heat transfer coefficient and ambient temperature for each node into the Quick Junction Temperature Predictor Tool.

• Click the Model Type icon on the Compact Model page (Figure 6-22), which takes you to the compact model results sheet.

Figure 6-22. Accessing Results Sheet of DELPHI Compact Model

• At the bottom of the results sheet there are three buttons (Figure 6-23). Click Nodes Temperature Prediction to go to the Temperature Prediction input screen (Figure 6-24).

Figure 6-23. Accessing the Nodes Temperature Predictor

Figure 6-24. Temperature Prediction Input Screen showing Input Values

• Enter the following data:

• Junction power: this can be any arbitrary number, and does not have to be the same as the one entered in your (detailed model) design sheet.

• Ambient temperatures: the ambient temperature corresponding to each node.

• Heat transfer coefficient: the heat transfer coefficient that links each node to its ambient.

• Click Predict Node Temperatures

The calculated (predicted) values of the junction and other node temperatures will then be displayed, see Figure 6-25.

Note
	If the temperature rather than the heat transfer coefficient for a particular node is known (this is common for the bottom or lead nodes, where the board temperature is easier to estimate than the effective heat transfer coefficient), enter the temperature in the ambient temperature field and set a high value for the heat transfer coefficient (say 5e5).

Figure 6-25. Temperature Prediction Input Screen showing Calculated Values