WEBENCH® Tools/LMC662: LMC662 Spice Model

Hi Alan,

You can find LMC662 PSPICE model here: http://www.ti.com/product/LMC662/toolssoftware. This file contains the SPICE code for this model. You can convert this file into macro icon in TINA. I've already done that work for you. Please find the attachment to this thread. 

LMC662.TSC

Best Regards,

Bala Ravi

Hi Bala, Many thanks for the speedy response. But unfortunately it did not solve my problem - it just led me to the same files as before:-

Your first link led me to a page inviting me to click on LMC662 PSPICE Model. When I did this I got a zip file :- Snom170.zip.  So I opened this using Rar Zip Extractor Pro. This gave me two files :- LMC662A.MOD and LMC662B.MOD.  I can't open these files, so what am I supposed to do with them? 

I then tried clicking on your second link. This gave me the model of LMC662 in TINA-9, but, like the LMC662A I already have, it has no model parameters in it. So presumably will have the same inability to recognise when conditions are unsuitable for it.

I don't think there is anything special about the LMC662 Spice Model. I get the same issue with any model I click from your Webench.ti.com/webench5/spicemodels/# page. So clearly I am doing something wrong. Can someone please tell me what that is?

By the way I have watched the TI video on installing spice models, but that just showed me the type of data file I should be getting, but am not..

Regards,

Alan Morris.

Hi Alan,

The file attached in my earlier thread contains the model for LMC662A.mod and LMC662B.mod (these are the files you were not able to open on TINA). I created a macro out of them so you could use them to simulate your circuit. 

I've attached an example circuit for your reference below. The attached circuit is in inverting configuration with G = -5. 

LMC662A.TSC

Best Regards,

Bala Ravi

Hi Bala,

I'm totally confused. What I really wanted was an LMC662 to add to my list of Op Amps in Tina-9 with all its parameters. But you've given it to me as a Macro, which like all the other Macros in Tina-9 has no parameters. 

Why are there two of them (A & B)?

Why has one of them got three '9' terminals?

Is not the LMC662A the same as the LMC662A I already had from the list of Macros in Tina-9?

How do I insert your Macro into my circuit? I tried copying and pasting but that didn't work.

I tried your circuit out and found that, just like I found in my original question, you can input 1000V into it, and it seems to work perfectly! - surely not, as its max input is supposed to be +15V.

I'm also none the wiser as to why I was unable to extract and install LMC662 from the Webench. Unless I know what I am doing wrong, I'm going to need TI Support help everytime I want to use one from the Webench list

Please help.

Regards,

Alan Morris

Hi Alan,

• I'm totally confused. What I really wanted was an LMC662 to add to my list of Op Amps in Tina-9 with all its parameters. But you've given it to me as a Macro, which like all the other Macros in Tina-9 has no parameters.

What do you mean by "no parameters"?

• Why are there two of them (A & B)?

These are the older version PSPICE model that are different from our current architecture. B is a revised version of A. I just checked both the versions and B is not working, so please go ahead and use version A.

• Why has one of them got three '9' terminals?

Where do you see this?

• Is not the LMC662A the same as the LMC662A I already had from the list of Macros in Tina-9?

Yes, it is the same macro that is listed in TINA-9

• How do I insert your Macro into my circuit? I tried copying and pasting but that didn't work.

My macro should be same as the TINA-9 macro. You just click on the op amp icon and ctrl+C and Ctrl+V to your circuit. 

• I tried your circuit out and found that, just like I found in my original question, you can input 1000V into it, and it seems to work perfectly! - surely not, as its max input is supposed to be +15V.

These models were designed to work this way. But in reality, if the same is tried in lab it will damage the device. 

• I'm also none the wiser as to why I was unable to extract and install LMC662 from the Webench. Unless I know what I am doing wrong, I'm going to need TI Support help everytime I want to use one from the Webench list.

This device has a older model. In future if you try downloading the models for more recent devices then Webench should also give you the macro and sample circuit for TINA (newer models have these included). 

Best Regards,

Bala Ravi

Hi Bala,

Very sorry to have taken up so much of your time. Here are the answers to your questions and comments:-

1) I couldn't see any parameters on any of the Macros, until I realised you have to "Enter Macro" to see them. Not that they were much use to me but at least I know they are there.

2) The three '9' terminals are what appear on the 'A' Macro you sent me as soon as I place it into the TINA page.

3) I tried just clicking on the OP AMP symbol, Ctrl C, Ctl V, but it didn't work - nothing copied.

Although not all my questions have been answered, I think we should close this thread now as I don't feel that we getting any closer to a solution. And since you say that the LMC662A is the same as the one I have been using all along, then maybe my circuit diagram is OK after all.

Many thanks again for your time.

Regards,

Alan.

Hi Alan,

No problem. Here are some training videos on TINA: https://training.ti.com/tina-ti-video-training-series.

Best Regards,

Bala Ravi