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Start a SimulationExternal thermal resistance yields strange result?
Zan_H
Wolfspeed Employee - Contributor Level 2
A customer reported that he's getting strange results in LTspice when connecting an external thermal resistance. Please see below.
The circuit works in above condition, reading ~78C for Tj and ~63C for Tc, which matches datasheet calculation. It also works for R2 value between 0-0.8.
However, if we change R2 value to 0.81, Tj suddenly reads 450C and Tc reads 280C, which makes no sense.
May I know what could be the reason for this?
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