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LM2676 Thermal Resistivity in WebTHERM

Jason Schepler
Prodigy 120 points
Other Parts Discussed in Thread: LM2676

On the LM2676 data sheet for the KTW package there are three thermal resistances (theta juction-to-ambient) listed, 56, 35 and 26 C/W depending on the copper pad the device is placed on.  The 26 C/W is for a copper area of approx. 1 square inch, something that will not fit on my current PCB.  I would like to use WebTHERM to view the heat being dissipated by the device when a different pad area is used, but I do not see an option to change the thermal resistance, it is set to 26 C/W.

Also, I will be using 1 oz. of copper and I can make that selection when editting the WebTHERM simulation, but when I actually run it, the value selected is 2 oz. 

1) Is there a way to select different thermal resistances for devices?

2) Why does the simulation go back to 2 oz. after I have selected 1 oz?

Thanks.

Jason Schepler

 

 

 

  • 0
    TI__Expert 6365 points

    Hi Jason,

    Sorry, we don't have a way for the user to change the thermal resistance of the device. However, we are working on something that allows the user to adjust the IC contact copper area to emulate their board layout. .

    For the 1oz couple simulation to stick, please don't click on the "Update" button after you made your selection. Just select the desired sim. copper weight and click on the "Run Simulation" button.

    Let us know if you have more questions.