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How assign the thermal resistance correctly in AEDT Icepak

- March 21, 2025 at 9:35 am
  
  vishalgnair1812
  Subscriber
  
  I have a QFN package cad model made in solidworks. The die is disspating heat of 100 W and the junction to case resistance is 0.5 °C/W. I tried assigning the top surface of die and bottom surface of thermal pad as network model and gave the thermal resistance. But, everytime I do that the solution divereges. What can be the solution for this problem and if anyone could share a how a network model will be it could be helpful.
  
  Thank you
- March 25, 2025 at 10:34 pm
  
  Rabindra Paul
  Ansys Employee
  
  Hi Vishal: Thanks for using Forum to ask question. You may review workshop 1 for AEDT Icepak Introductory training material for the steps to create 2-R network. Please make sure: Network block have Solve Inside turned off
  ‐ Make sure ‘Solve Inside’ option is turned off for the Die object which you are modeling as a network.
  However, solution divergence could have for many other reasons.
  
  Hope this is of help.
  
  Regards,
  
  Rabindra
- March 27, 2025 at 10:27 am
  
  vishalgnair1812
  Subscriber
  
  Hi Rabindra. Thank you for the suggestion, I was previously missing out on the solve inside has to be unchecked.

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