Re: OPA349 spice model acting weird

"Jim Thompson" <thegreatone@xxxxxxxxxxx> schrieb im Newsbeitrag
news:po7oc1d0936ie3g6h16r3f5jks2u7fvgqi@xxxxxxxxxx
> On Wed, 6 Jul 2005 20:02:37 +0200, "Helmut Sennewald"
> <helmutsennewald@xxxxxxxxxxx> wrote:
>
>>"Tom (at tomsweb.net)" <tomtorfs@xxxxxxxxxxxxxxxx> schrieb im Newsbeitrag
>>news:1120650714.692137.269580@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>>> > I tried the model with LTspice and see the same problem as you
>>>> > have described. I recommend you write a letter to AD.
>>>> Sorry, it's TI and not AD,
>>>
>>> TI just confirmed that their model is crap (actually I would prefer
>>> them not offering a model at all in that case!).
>>>
>>> --snip--
>>> You were requesting the information about OPA349 Spice macro model. Our
>>> OPA349 macromodel is not a very good one. It was written 5 years ago
>>> and I've found that it does have some problems (Especially Low Voltage
>>> problems,less than 3Volts) .Sorry for the inconvenience caused.
>>>
>>> You might want to consider using the TLV2401 device and the
>>> specifications are almost similar to OPA349. The TLV2401 device has a
>>> Spice model and it can be downloaded from TI website
>>> (http://focus.ti.com/docs/prod/folders/print/tlv2401.html#productmodels
>>> ).
>>> --snip--
>>>
>>> I'm now simulating with the TLV2401 model, which works. However, the
>>> real circuit will use a OPA349, because my supply is less than 2.5V
>>> (the minimum for TLV2401).
>>>
>>> greetings,
>>> Tom
>>
>>Hello Tom,
>>
>>thanks for this information. I will keep this message in my folder.
>>
>>It sounds like TI will not spend any money/time to correct
>>this model. What a bad service to their customers when I assume
>>that they eventually know since 5 years that the model is wrong.
>>
>>Best regards,
>>Helmut
>>
>
> They (and others :) are not willing to spend the money it takes to
> derive a good model.
>
> But that provokes a question to you... Would you PAY for a good
> model?
>
> ...Jim Thompson


Hello Jim,

I expect for standard parts that the manufacturer provides
the model. If not then I would firstly try to make my own
model before I spend money for unknown quality.

Best regards,
Helmut


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