Operating point not found OPA2188

Britt,

Thanks for the fast response.

I have downloaded from TI website a zip file containing  TSM, TLD, LIB files, copied into the TINA Spice folder and recompiled the library from the tools menu. It was working at the beginning, but later as I built the additional details of the circuit it worked less and less. After I closed the feedback it  has stopped.

Still doesn't work what you sent. The DC Anal works, the Transient works if I check the "Use initial condition" or "Zero initial values" at Analysis start.

AC Analysis, and other options endig with error message I have attached.

The same if I copy and paste the opa2188 from the reference design.

From your answer I have relized all parts has some TINA related data on the part's webpage. The upper current shunt monitor is intended to be an ina282 but I havent found it in the library section and used ina213 what is quite close in function.  Now I have found on the webpage

,

but this is different than OPA2188 simulation data and reference design. I can't copy it from the drawing.

How to handle Pspice data to load into the database.

Is it possible to load simulation data from other manufacturers? Like Maxim *.FAM files?

Csaba,

There are a few things I need to clarify. The first is with a DC simulation. Why would you run a DC simulation on an AC or Transient model? The DC simulation of a time or frequency based circuit is relatively uninteresting unless you are looking to see if your power supplies are biased correctly (or perhaps a voltage divider being used).

The .TSC file in the OPA2188 product folder (Reference Design) appears to work correctly for AC and transient simulations. I am not sure why your simulation does not work in the AC simulation. In the transient simulation, the use/zero initial conditions option skips the DC bias point calculation (which appears to be failing for the AC case). This DC bias point calculation is simply a starting point for the matrix before the first time point is calculated. In some cases, the simulator will generate a starting point that is not close enough to have the matrix solved based on the simulation parameters specified. This is why the options exist.

You might want to check the analysis parameters from the reference design for the OPA2188 and use those to see if the issue will be resolved.

As for importing data, you can use the PWL source for importing data as long as it is in a time value pair (Time, Value). In the PWL source, you an select a file to import and use that as a voltage or current source. If you are looking to import data into the plotter, you can import CSV or test data into the plotter. Simply select File-->Import from the plotter window menu.

You can also cut and paste the diagram window contents (as a picture) using ctrl-c and ctrl-v.

Hi Britt,

The copy of parameters worked. Now the OPA2188 simulation is fine. Thanks.

Then I had fault with LM358 simulation, but since I had changed it to LM324 it works flawless!

I am not fully understand what should be clarified:

I need DC and AC simulation both. This is a DC circuit, I need the transfer function simulation.

And AC/Transient for stability.

Data import:

I would like to be lazy if possible.

Could Tina handle the translation of different model formats for Tina compatible model format?

As far as I found the free version is very limited in this function.

Even on TI's website there are different simulation models:

opa2188

ina282

ina226.

Can you suggest a tutorial where I can find the proper model import handling?

Regards, Csaba

Csaba,

I am glad the circuit is working.

For importing PSpice models into TINA-TI, please refer to this document:

http://www.ti.com/lit/an/slva527/slva527.pdf

TINA-TI is not limited at all and actually functions very well when importing PSpice models. You must be aware that the model has to be unencrypted to import. Many PSpice models are encrypted and can ONLY be used in PSpice. If you can see the netlist (not just a bunch of letters and numbers), that normally means that the netlist is unencrypted.

TINA-TI also has hundreds of circuit examples built into the tool. Simply choose the File-->Open Examples... There are many examples of circuits and test circuits for the TI products that are built into the tool. You can also download the TINA-TI reference design from the TI Product folder. To see if a TINA-TI model is available, please use this link:

http://webench.ti.com/webench5/spicemodels/

You can search by product type and sort models by simulator or type of model. You can also download them directly from the search page.

Most of the TI products that have PSpice models will also have TINA-TI models. In some cases, you may have to import the PSpice model from TI into TINA-TI using the unencrypted model. However, if the model is encrypted, TI will import it for you into TINA-TI. For power products, WEBENCH® Power Designer can export TINA-TI designs from your custom design.

IBIS models are not SPICE models and cannot be imported into TINA-TI. HSPICE models cannot be imported into TINA-TI either as HSPICE uses a much different format and structure for their models.

I hope this information helps. For complete information on TI models and tools, please check here:

http://www.ti.com/lsds/ti/analog/webench/overview.page

Britt,

Thank you very much for the valuable links.
I will evaluate in details later.