On 6/3/2020 11:32 PM, Ricketty C wrote:
> On Wednesday, June 3, 2020 at 6:34:36 AM UTC-4, John S wrote:
>> On 6/2/2020 8:55 PM, Ricketty C wrote:
>>> On Tuesday, June 2, 2020 at 1:47:55 PM UTC-4, John S wrote:
>>>> On 6/1/2020 5:22 PM, jlarkin@highlandsniptechnology.com wrote:
>>>>> On Mon, 1 Jun 2020 16:26:13 -0500, John S <Sophi.2@invalid.org> wrote:
>>>>>
>>>>>> I can't find a way to get TI's model into LTspice. So, I tried TI's
>>>>>> online simulator. It does not give a reasonable output even using their
>>>>>> default schematic. And, it is glacially slow -- they say it might take
>>>>>> up to 15 minutes to complete an analysis.
>>>>>>
>>>>>> Has anyone else had this problem?
>>>>>
>>>>> I've tried to run Webench but it never ran on any of my computers. I'm
>>>>> guessing it's running Javascript on your PC, or delegating the math to
>>>>> some server.
>>>>>
>>>>> One of my guys can actually run Tina, but I don't want to use it for
>>>>> anything serious.
>>>>>
>>>>> We have imported a few of the TI Pspice models into LT, but it's a
>>>>> minor hassle, especially the symbols.
>>>>>
>>>>> What part are you trying to import?
>>>>>
>>>>
>>>> Thanks for your reply. It is the TPS62177DQCT.
>>>
>>> What sort of trouble do you have importing the model to LTspice.  Is it that the model isn't working at all or that it isn't simulating as the device should work?  Any error messages?
>>>
>>
>> I can't find a file on the TI Web site that looks like a model file.
> 
> Oh, you need to write and ask.  That was the only way I got a model for one of their 555 timer chips.  Even then it was a TINA model and used at least one feature that was unique to that software.  A simple change to the model file fixed it.  They define internally the voltage as a function of temperature called VT.  You could define the function or just make it 25 mV.
> 
> I thought it was weird that I had to ask support for it, but many companies are like that.  Some companies will put models on their web pages, but if there's one without a model and you ask for it, they will provide one.  I suspect they have someone write it for you.  That was a transistor, so not so hard for the designer to specify something close to the real device.
> 
> Still, seek and ye shall receive.
> 

Thanks for the tip, Rick.

On Wednesday, June 3, 2020 at 6:34:36 AM UTC-4, John S wrote:
> On 6/2/2020 8:55 PM, Ricketty C wrote:
> > On Tuesday, June 2, 2020 at 1:47:55 PM UTC-4, John S wrote:
> >> On 6/1/2020 5:22 PM, jlarkin@highlandsniptechnology.com wrote:
> >>> On Mon, 1 Jun 2020 16:26:13 -0500, John S <Sophi.2@invalid.org> wrote:
> >>>
> >>>> I can't find a way to get TI's model into LTspice. So, I tried TI's
> >>>> online simulator. It does not give a reasonable output even using their
> >>>> default schematic. And, it is glacially slow -- they say it might take
> >>>> up to 15 minutes to complete an analysis.
> >>>>
> >>>> Has anyone else had this problem?
> >>>
> >>> I've tried to run Webench but it never ran on any of my computers. I'm
> >>> guessing it's running Javascript on your PC, or delegating the math to
> >>> some server.
> >>>
> >>> One of my guys can actually run Tina, but I don't want to use it for
> >>> anything serious.
> >>>
> >>> We have imported a few of the TI Pspice models into LT, but it's a
> >>> minor hassle, especially the symbols.
> >>>
> >>> What part are you trying to import?
> >>>
> >>
> >> Thanks for your reply. It is the TPS62177DQCT.
> > 
> > What sort of trouble do you have importing the model to LTspice.  Is it that the model isn't working at all or that it isn't simulating as the device should work?  Any error messages?
> > 
> 
> I can't find a file on the TI Web site that looks like a model file.

Oh, you need to write and ask.  That was the only way I got a model for one of their 555 timer chips.  Even then it was a TINA model and used at least one feature that was unique to that software.  A simple change to the model file fixed it.  They define internally the voltage as a function of temperature called VT.  You could define the function or just make it 25 mV.  

I thought it was weird that I had to ask support for it, but many companies are like that.  Some companies will put models on their web pages, but if there's one without a model and you ask for it, they will provide one.  I suspect they have someone write it for you.  That was a transistor, so not so hard for the designer to specify something close to the real device. 

Still, seek and ye shall receive. 

-- 

  Rick C.

  + Get 1,000 miles of free Supercharging
  + Tesla referral code - https://ts.la/richard11209

Le 02/06/2020 &agrave; 00:22, jlarkin@highlandsniptechnology.com a &eacute;crit&nbsp;:
> One of my guys can actually run Tina, but I don't want to use it for
> anything serious.
Agreed with this.
For years I used LTSpice on designs of my own; Even Symetrics/Simpliss 
can not compete with LTSpice.

Remember M. Engelhardt speaking about intuition (and Janis Joplin ;-) )

I bless him for this masterpiece, me a senior analog engineer.

H

On 6/3/2020 7:39 AM, jlarkin@highlandsniptechnology.com wrote:
> On Tue, 2 Jun 2020 12:48:41 -0500, John S <Sophi.2@invalid.org> wrote:
> 
>> On 6/1/2020 5:22 PM, jlarkin@highlandsniptechnology.com wrote:
>>> On Mon, 1 Jun 2020 16:26:13 -0500, John S <Sophi.2@invalid.org> wrote:
>>>
>>>> I can't find a way to get TI's model into LTspice. So, I tried TI's
>>>> online simulator. It does not give a reasonable output even using their
>>>> default schematic. And, it is glacially slow -- they say it might take
>>>> up to 15 minutes to complete an analysis.
>>>>
>>>> Has anyone else had this problem?
>>>
>>> I've tried to run Webench but it never ran on any of my computers. I'm
>>> guessing it's running Javascript on your PC, or delegating the math to
>>> some server.
>>>
>>> One of my guys can actually run Tina, but I don't want to use it for
>>> anything serious.
>>>
>>> We have imported a few of the TI Pspice models into LT, but it's a
>>> minor hassle, especially the symbols.
>>>
>>> What part are you trying to import?
>>>
>>
>> Thanks for your reply. It is the TPS62177DQCT.
> 
> We recently imported the OPA547 model from TI, and hacked it into LT
> Spice. I can run a circuit if just the .cir and .asy files are present
> in the local folder.
> 
> The .cir is a text file, presumably Pspice compatible, but it says
> it's for TINA. LT spice likes it, but you have to connect it to a
> symbol. It will default to making a really ugly box that looks nothing
> like an opamp.
> 
> There's probably tutorials and stuff online. There is tons of help
> available for LT Spice.
> 
> I'm using the TPS54302 and we couldn't get that into LT, probably
> encripted or something. I breadboarded that one.
> 

Thanks, John. I'll try again and see what I can do. Although the 
TPS62177DQCT is a switching regulator and not an op-amp.

On Tue, 2 Jun 2020 12:48:41 -0500, John S <Sophi.2@invalid.org> wrote:

>On 6/1/2020 5:22 PM, jlarkin@highlandsniptechnology.com wrote:
>> On Mon, 1 Jun 2020 16:26:13 -0500, John S <Sophi.2@invalid.org> wrote:
>> 
>>> I can't find a way to get TI's model into LTspice. So, I tried TI's
>>> online simulator. It does not give a reasonable output even using their
>>> default schematic. And, it is glacially slow -- they say it might take
>>> up to 15 minutes to complete an analysis.
>>>
>>> Has anyone else had this problem?
>> 
>> I've tried to run Webench but it never ran on any of my computers. I'm
>> guessing it's running Javascript on your PC, or delegating the math to
>> some server.
>> 
>> One of my guys can actually run Tina, but I don't want to use it for
>> anything serious.
>> 
>> We have imported a few of the TI Pspice models into LT, but it's a
>> minor hassle, especially the symbols.
>> 
>> What part are you trying to import?
>> 
>
>Thanks for your reply. It is the TPS62177DQCT.

We recently imported the OPA547 model from TI, and hacked it into LT
Spice. I can run a circuit if just the .cir and .asy files are present
in the local folder. 

The .cir is a text file, presumably Pspice compatible, but it says
it's for TINA. LT spice likes it, but you have to connect it to a
symbol. It will default to making a really ugly box that looks nothing
like an opamp.

There's probably tutorials and stuff online. There is tons of help
available for LT Spice.

I'm using the TPS54302 and we couldn't get that into LT, probably
encripted or something. I breadboarded that one.

-- 

John Larkin         Highland Technology, Inc

Science teaches us to doubt.

  Claude Bernard

On 6/2/2020 8:55 PM, Ricketty C wrote:
> On Tuesday, June 2, 2020 at 1:47:55 PM UTC-4, John S wrote:
>> On 6/1/2020 5:22 PM, jlarkin@highlandsniptechnology.com wrote:
>>> On Mon, 1 Jun 2020 16:26:13 -0500, John S <Sophi.2@invalid.org> wrote:
>>>
>>>> I can't find a way to get TI's model into LTspice. So, I tried TI's
>>>> online simulator. It does not give a reasonable output even using their
>>>> default schematic. And, it is glacially slow -- they say it might take
>>>> up to 15 minutes to complete an analysis.
>>>>
>>>> Has anyone else had this problem?
>>>
>>> I've tried to run Webench but it never ran on any of my computers. I'm
>>> guessing it's running Javascript on your PC, or delegating the math to
>>> some server.
>>>
>>> One of my guys can actually run Tina, but I don't want to use it for
>>> anything serious.
>>>
>>> We have imported a few of the TI Pspice models into LT, but it's a
>>> minor hassle, especially the symbols.
>>>
>>> What part are you trying to import?
>>>
>>
>> Thanks for your reply. It is the TPS62177DQCT.
> 
> What sort of trouble do you have importing the model to LTspice.  Is it that the model isn't working at all or that it isn't simulating as the device should work?  Any error messages?
> 

I can't find a file on the TI Web site that looks like a model file.

On Tuesday, June 2, 2020 at 1:47:55 PM UTC-4, John S wrote:
> On 6/1/2020 5:22 PM, jlarkin@highlandsniptechnology.com wrote:
> > On Mon, 1 Jun 2020 16:26:13 -0500, John S <Sophi.2@invalid.org> wrote:
> > 
> >> I can't find a way to get TI's model into LTspice. So, I tried TI's
> >> online simulator. It does not give a reasonable output even using their
> >> default schematic. And, it is glacially slow -- they say it might take
> >> up to 15 minutes to complete an analysis.
> >>
> >> Has anyone else had this problem?
> > 
> > I've tried to run Webench but it never ran on any of my computers. I'm
> > guessing it's running Javascript on your PC, or delegating the math to
> > some server.
> > 
> > One of my guys can actually run Tina, but I don't want to use it for
> > anything serious.
> > 
> > We have imported a few of the TI Pspice models into LT, but it's a
> > minor hassle, especially the symbols.
> > 
> > What part are you trying to import?
> > 
> 
> Thanks for your reply. It is the TPS62177DQCT.

What sort of trouble do you have importing the model to LTspice.  Is it that the model isn't working at all or that it isn't simulating as the device should work?  Any error messages? 

-- 

  Rick C.

  - Get 1,000 miles of free Supercharging
  - Tesla referral code - https://ts.la/richard11209

On 6/1/2020 5:22 PM, jlarkin@highlandsniptechnology.com wrote:
> On Mon, 1 Jun 2020 16:26:13 -0500, John S <Sophi.2@invalid.org> wrote:
> 
>> I can't find a way to get TI's model into LTspice. So, I tried TI's
>> online simulator. It does not give a reasonable output even using their
>> default schematic. And, it is glacially slow -- they say it might take
>> up to 15 minutes to complete an analysis.
>>
>> Has anyone else had this problem?
> 
> I've tried to run Webench but it never ran on any of my computers. I'm
> guessing it's running Javascript on your PC, or delegating the math to
> some server.
> 
> One of my guys can actually run Tina, but I don't want to use it for
> anything serious.
> 
> We have imported a few of the TI Pspice models into LT, but it's a
> minor hassle, especially the symbols.
> 
> What part are you trying to import?
> 

Thanks for your reply. It is the TPS62177DQCT.

On Mon, 1 Jun 2020 16:26:13 -0500, John S <Sophi.2@invalid.org> wrote:

>I can't find a way to get TI's model into LTspice. So, I tried TI's 
>online simulator. It does not give a reasonable output even using their 
>default schematic. And, it is glacially slow -- they say it might take 
>up to 15 minutes to complete an analysis.
>
>Has anyone else had this problem?

I've tried to run Webench but it never ran on any of my computers. I'm
guessing it's running Javascript on your PC, or delegating the math to
some server.

One of my guys can actually run Tina, but I don't want to use it for
anything serious. 

We have imported a few of the TI Pspice models into LT, but it's a
minor hassle, especially the symbols. 

What part are you trying to import?

-- 

John Larkin         Highland Technology, Inc

Science teaches us to doubt.

  Claude Bernard