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pspice model issue

tltoth

Hi,

I've a circuit to perform temperature analysis on which contains an NXP transistor PBHV9040T.
I downloaded the spice model from the NXP site h..p://www.nxp.com/documents/spice_model/PBHV9040T.prm
During temperature sweep pspice gives the following error message "simulation aborted because VJC is negative"
Then I simulated the output characteristic curves of the transistor and I obtained the same result.
This transistor gives negative VJC value above 54 Celsius. Since the SGP equations are provided on page 253 of pspcref.pdf
I calculated this parameter by hand and the result is the same as calculated by the program.
The initial value of the VJC is such a small as 0.102 which might cause the problem.
When I asked NXP for explanation they told that they use LTspice and there is no simulation problem with that.
So the question is whether the built in SGP equations are wrong whitin the PSpice or the NXP spice model is invalid?
Would someone (VAR) please check the model?

Thanks

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  • tltoth

    Thank you alokt for the response!
    You must be right with the clamping effect.
    As per datasheet the operating temperature range of this device  extends from -33 to 150.
    They also provide measurement results for 100C (see figs of datasheet)
    With VJC of 0.25 we can  reach 100C but there are other 37 temperature dependent model parameters to tune to.
    I don't believe this would be the right way...

Reply
  • tltoth

    Thank you alokt for the response!
    You must be right with the clamping effect.
    As per datasheet the operating temperature range of this device  extends from -33 to 150.
    They also provide measurement results for 100C (see figs of datasheet)
    With VJC of 0.25 we can  reach 100C but there are other 37 temperature dependent model parameters to tune to.
    I don't believe this would be the right way...

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