Hello guys, good afternoon.

I'm having problems with LTSpice. Yesteday I downloaded this software (never used it) and watched some videos about how to add third party devices.
For example, I want to simulate the INA240A1 from Texas Instruments

From this link
https://www.ti.com/product/INA240?keyMatch=INA240&tisearch=search-everything&usecase=GPN-ALT#all
I downloaded this model and downloaded a .zip folder sbombe4.zip



there is a file named ina240a1.lib. I put it inside this path.



Also, I created a symbol for this component and I put it in this path.


The symbol is this



I have this circuit


but when trying to simulate in dc sweep the output of the ina240 is always 2.47V

 

I can only Attach 10 files
The output is this

if I try to simulate this circuit is TINA-TI software the output is this


I tried to generate a symbol from the .lib but the result is the same


Would you be so kind as to tell me where I went wrong?

 

Hello crutschow, thank you for answering my message. I double checked this part. Share the images

 

I think the LTspice and the TINA Circuits are not the same. I'm puzzled as to why you might expect similar results. Here are my results after cleaning things up a bit. It looks reasonable to me.

 

Hello papabravo, thank you for answering too!
Yes, LTSpice and TINA are not the same. But... if I have the same .lib file to simulate this component, why should I expect different results? If TINA makes the dc sweep and the ouput is linear why not on LTSpice?
Sorry, I'm not be able to understand that part. I have much to learn!

Now I have this circuit. the I2 source is a triangular wave. According to the datasheet, the INA240A1 have a gain of 20V/V, and with a Rsense = 10m the output would be Vout = Gain * Vdiff. With a Vdiff_max = 50mV then Vout = (20)(50mV) = 1V


Thank you very much guys for the help provided!!!

 

Looks like we both get the same thing. Question: why did you hide the text for the current source I2? It helps to debug things if you make the critical pieces of text VISIBLE!

 

Sorry for hide the value of I2!!
But is the same value that you have

*Note, I don't know if when I attach the .asc file, the .lib file of each component are include or I have to attach it separately? Because for the OpAmp I'm using the OPAx189 (attach the .lib). However the Opamps are not the main subject. I could include an ideal amplifier

 

Sorry for hide the value of I2!!
But is the same value that you have

*Note, I don't know if when I attach the .asc file, the .lib file of each component are include or I have to attach it separately? Because for the OpAmp I'm using the OPAx189 (attach the .lib). However the Opamps are not the main subject. I could include an ideal amplifier

There is a process for finding the things that are needed. In the case of your original schematic, the .asc and the .asy and the .lib file were all in the same folder. That is one of the places LTspice will look for things — in the same folder as the .asc file. The nex pace it will look ist in the library folder, typically %HOMEPATH%\Documents\LTspiceXVII\lib\sub, and then on any other paths you have entered in the control panel.

You can also include specific path information in the .lib or .inc SPICE directives. There is also the ability to use the "Modelfile" attribute in the symbol definition (.asy file).

The following is from the LTspice Help file:

.LIB -- Include a Library ​

Syntax: .lib <filename>​

​

This directive includes the model and subcircuit definitions of the named file as if that file had been typed into the netlist instead of the .lib command. Circuit elements at global scope are ignored.​

​

An absolute path name may be entered for the filename. Otherwise LTspice looks first in the directory %HOMEPATH%\Documents\LTspiceXVII\lib\cmp and then %HOMEPATH%\Documents\LTspiceXVII\lib\sub and then in the directory that contains the calling netlist.​

​

​

 

If you have and maintain custom libraries of components and subcircuits, you can add those libraries to the search path in the Control Panel in the following screen:

 

Thanks for such valuable information. Actually I have one path to save my third party libraries.
LTSpice is a great tool, I'm very new to this, I need to learn more about it because it's a bit hard to learn.


once again thanks for your advice