Learning Forum

[ThermalSamoyed]

Hello,

I'm trying to model a TO-220 package with a theta_jc of 5 C/W with a heat sink attached to the side of the package and have a few questions

1) is it accurate to model the electronic as a block with 2 node resistor. My plan was to set the ta_jc as 5 c/w (from spec sheet) and calculate the theta_jb as the theta_jc resistance + lead resistance. Is that acceptable or am I double booking theta_jc?

thanks

[Pdev]

Hello, 

1) It would be best to get the Theta_jb from the vendor. Using the Theta_jb as Theta_jc+ lead resistance will affect the accuracy of the solution.

2) This is a design decision. As an Ansys employees I cannot provide help on the design decision. We encourage any other forum members to pitch in for this.

Please let me know if you have any simulation related questions. 

Thanks! 
Pdev