LM5017: Convergence problem during pulse simulation

Ronny Thomsen

Other Parts Discussed in Thread: LM5017

I'm simulating LM5017 which works fine with a constant input voltage. However, I now want to test a overvoltage transient protection circuit in front of the LM5017 and I'm using a piesewise linear voltage generator to specifiy the short 125V pulse that I have set to occur after 10ms of simulation time. When the simulation hits 10ms (i.e when the 125V pulse hits the system) there is a convergence error and I dont know how to solve it.

Can someone please help me ?

I have attached the TINA file.

Best regards

/Ronny

over 9 years ago

0 Britt Brooks - Online Design Tools over 9 years ago

TI__Mastermind 41310 points

Ronny,

I am taking a look at this and a couple of other convergence issues on the forum. I have not been able to find a suitable solution yet.

0 Ronny Thomsen over 9 years ago in reply to Britt Brooks - Online Design Tools

Prodigy 150 points

Thanks for your effort, and I would be very grateful if you could find a solution, and also to to be able learn more about TINA for future simulation projects.

If you cant find a solution it would be grate of you could give some hint on why, and if possible what to change in the schematics to get it to work..

Ronny

0 Britt Brooks - Online Design Tools over 9 years ago in reply to Ronny Thomsen

TI__Mastermind 41310 points

Ronny,

I could not get the test to converge after several trials. There may be an issue with the model, however, I have yet to find the problem. The simulation runs properly with a spike of 45V or lower, or if you start at a voltage of 38V or higher with the 125V spike. Very strange.

I hope this information helps. I will look at the issue a little deeper, but that will take some time.

0 Ronny Thomsen over 9 years ago in reply to Britt Brooks - Online Design Tools

Prodigy 150 points

OK, well that is still very useful information since one actual situation in the real world application is a supply voltage of 48V and a spike to 125V.

It would however be very useful if you could get the model to work during other conditions.

Thanks a lot :-)

Best regards

Ronny

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LM5017: Convergence problem during pulse simulation