TINA/Spice/LMG5200: ERROR -- Convergence problem in transient bias point calculation

Daniel Ruiz

Intellectual 2910 points

Part Number: LMG5200
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Modeling team,

One of my customers is experiencing issues with the LMG5200 PSpice model. Their message below:

I Have the lmg5200.lib file from TI Web site. (LMG5200 PSpice Transient Model (Rev. B))

I wanted to revive the LMG5200 simulation, I took licensed Pspice and try to run the models

Got errors I can’t resolve:

Attached “run”.out log file

Note the error immediately after .END of the netlist

“ERROR -- Convergence problem in transient bias point calculation”

I tried “auto – convergence” feature, it run longer time but still gives the same error

What could be causing this error?

Thanks,

-Daniel

over 7 years ago

0 Daniel Ruiz over 7 years ago

TI__Intellectual 2910 points

Folks, any feedback?

0 Nikhil Gupta (Product Folder Models) over 7 years ago in reply to Daniel Ruiz

TI__Mastermind 39210 points

Daniel,

Have you made any changes to the schematic? What version of PSpice are you using?

0 Daniel Ruiz over 7 years ago in reply to Nikhil Gupta (Product Folder Models)

TI__Intellectual 2910 points

Nikhil,

The customer is simulating the LMG5200 in a very large circuit with many other devices. They said the simulation runs well using discrete GaN transistors from another vendor instead of the LMG5200. Their simulator is SLPS (www.pspice.com/.../pspice-slps.

I will reach out for more details. Any guidance will help me so I can ask for the right information.

- Daniel

0 Nikhil Gupta (Product Folder Models) over 7 years ago in reply to Daniel Ruiz

TI__Mastermind 39210 points

Daniel,

LMG5200 is just a driver. The GaN FET will always be external, so can you elaborate what you mean by "They said the simulation runs well using discrete GaN transistors from another vendor instead of the LMG5200". Also the SLPS link does not work for me. Can you double check?

I would like to ask them to use PSpice or TINA-TI for the simulation. If they can replicate the issue in these simulators, we may be able to look into this further.

0 Daniel Ruiz over 7 years ago in reply to Nikhil Gupta (Product Folder Models)

TI__Intellectual 2910 points

Nikhil,

I will suggest to them using PSpice or TINA-TI, although they are basically deciding to eliminate from consideration any components that don't work in their simulation environment. I have fixed a typo in the link to SLPS in my previous post. It should work now.

Regarding the LMG5200, it actually is not just a driver. It is a power stage module with a driver, capacitor, and two GaN FETs in a single package. Just FYI.

Thanks for your responsiveness. I will see what I hear back from the customer.

Regards,

- Daniel

0 Nikhil Gupta (Product Folder Models) over 7 years ago in reply to Daniel Ruiz

TI__Mastermind 39210 points

Daniel,

Yes that was an oversight on my end. The GaN is indeed internal. We looked at the PSpice model on the web. It works in PSpice 16.6 but gives a convergence issue in an older version (16.2). Not sure what what version of PSpice the customer is using. We will be posting a fix for the older version shortly. It is not related to the model, but to the analysis settings in the simulator.

0 ranjanir over 7 years ago in reply to Nikhil Gupta (Product Folder Models)

TI__Intellectual 1760 points

Hi Daniel

Thank you for helping us fix the LMG5200 simulation , We have updated the OrCad release files and this should be reflected in the new downloadable model in 1-2 business days.

Regards

Ranjani

0 Daniel Ruiz over 7 years ago in reply to Nikhil Gupta (Product Folder Models)

TI__Intellectual 2910 points

Nikhil,

Thanks for the prompt action. The customer is using PSpice 16.5.0. Do you think the same convergence issues apply?

I will stand by for the release of the updated model to point my customer to it.

Regards,

- Daniel

0 Nikhil Gupta (Product Folder Models) over 7 years ago in reply to Daniel Ruiz

TI__Mastermind 39210 points

Daniel,

The PSpice model revision has been released to the web now. Please give it a try. It works in 16.2, but we do not have 16.5 to test this out.

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TINA/Spice/LMG5200: ERROR -- Convergence problem in transient bias point calculation