ATL431 SPICE model problem

Sergey Markov

Other Parts Discussed in Thread: TL431, ATL431

Here is two simulations of one circuit with TL431 and ATL431 models. With TL431 model all is OK. With ATL431 model here is a problem - half of desired output wafe aren't present. How to patch ATL431 model for it's right behavior?

pctrl-tl431.TSC

pctrl-atl431.TSC

over 9 years ago

0 Sergey Markov over 9 years ago

Intellectual 510 points

An addition: this behavior is the same not only with TINA simulator! In the MICROCAP software this problem also present.

TL431 model used from simulator's library.
Link to used ATL431 model - http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=slvmbj2&fileType=zip

0 Sergey Markov over 9 years ago in reply to Sergey Markov

Intellectual 510 points

More information about this problem:

The "ATL431A_TRANS.LIB" file contains a comment - "* AC Response modeled as per new datasheet"

Modelled response are very significantly different from datasheet data!

Here is step response from datasheet for 50uA cathode current:

This is modelled step response for 50 uA cathode current:

Here is file with schematic:

strtup-atl431-50ua.TSC

0 Christopher Dean over 9 years ago in reply to Sergey Markov

TI__Intellectual 1745 points

Hi Sergey,

I downloaded your example files and was able to see the same results you posted. I went to the ATL431 product page to get the latest version of the model, and was directed to export instructions for WEBENCH. I followed the instructions and downloaded a TI TINA format model/example schematic. I replaced the ATL431 model from your schematic with this new model and got results that match the TL431 results you are looking for.

How to get the latest model:

navigate to the Tools and Software tab of the product page

"www.ti.com/.../toolssoftware"

Click on "TINA-TI Transient Spice Model (Export from WEBENCH) (Rev. A)" to launch the instructions pdf.

Follow these instructions to get a TI TINA example schematic download. Then simply copy the model from this example schematic and paste it into your schematic. Run the simulation again and you should see the results match the TL431 you posted above.

Let me know if you need help or run into problems.

Chris

0 Sergey Markov over 9 years ago in reply to Christopher Dean

Intellectual 510 points

Thank you. This works!

How to get a netlist of correct ATL431 SPICE model for using in MicroCap / HSPICE simulators ?

0 Christopher Dean over 9 years ago in reply to Sergey Markov

TI__Intellectual 1745 points

Hi Sergey,

If I am understanding you correctly, I believe you are looking to open the model and copy its contents to another simulator? I do not believe this is possible, the model is locked. I am not familiar with either of those simulators, but if it is possible to add a subckt you could try to add it that way. Sorry I cannot be more helpful.

You do have two other options for download from WEBENCH, Alitum and Cadence. Are either of those helpful?

Chris

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ATL431 SPICE model problem