All,
The VISHAY VOMDA1271 device simulates correctly.
The VISHAY LH1262 device fails due to a defective spice model.
The VISHAY VO1263 device fails due to a defective spice model.
I have submitted all of my simulation files to VISHAY and requested that they correct their spice files.
I will post a reply when I receive a response from VISHAY.
Mike
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Re: How to modify the Positive Threshold Voltage on ltspice built-in component?
sorry, i think i find the solution??
just setting the vt and vh on the spice line,right?
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Conditional PWL Current Source
Hello All,
?
I have four PWL current sources that drive a half-dozen switches to simulate the outside world.
The PWL current sources and switches push my simulation through its paces.
I would like to parallel aditional current sources to switch certain functions on or off differently from the standard paces that the four original PWL current sources provide.
All current sources are 0A or 1A and have 1 Ohm parallel resistors to cause a 0V or 1V output.
?
For example, one current source runs on:
pwl(0 0 48.2m 0 repeat forever (0 0 +20n 1 +11.99998m 1 +20n 0 +11.99998m 0) endrepeat)
I would like to parallel an additional current source that, as simply as possible, runs on:
IF(V(test)>0.5, 1, 0), probably a B source could be used here.
In this way, the signal V(test) should shut down the PWL current source and at the same time fire up the continuous current source.
What I can't figure out is how to get an externally controlled PWL current source that either does its PWL thing or zero output.
?
Having to remove the four PWL strings to shut down the PWL current sources is too error prone.
?
I tried to control the example PWL current source above, like this but, it does not work:
if(V(test)<0.5, pwl(0 0 48.2m 0 repeat forever (0 0 +20n 1 +11.99998m 1 +20n 0 +11.99998m 0) endrepeat), pwl(0 0))
It produces the error "Missing current value for I1".
?
I checked the help for behavioral sources and see no mention of PWL for a B source.
?
Any ideas?
?
Thank You
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Re: How to modify the Positive Threshold Voltage on ltspice built-in component?
On 21/05/2024 11:46, Leon show wrote:
i want to
invert a high level voltage through schmitt inverter , but the
data spec show the high level threshold is not as ltspice original
setting 50%, so can anyone teach me how to modify the threshold??
where can i give the command or modify the parameter?
You might find this useful:
Help > LTspice > LTspice? > Circuit Elements >
A. Special Functions > 1st Section
--
Regards,
Tony
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How to modify the Positive Threshold Voltage on ltspice built-in component?
Hello, everyone?
i want to invert a high level voltage through schmitt inverter , but the data spec show the high level threshold is not as ltspice original setting 50%, so can anyone teach me how to modify the threshold?? where can i give the command or modify the parameter?
thanks a lot !!!!
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Re: Build spice model of transimpedance amplifier
(OPA170 PSpice lib file).
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Re: Build spice model of transimpedance amplifier
Yeah I know that LTspice has several op amps. Probably all are from Analog Devices, right?
I contacted some manufacturers and they replied that they do not have SPICE models.
Thank you very much.
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Re: Build spice model of transimpedance amplifier
If I search the group's Files for "TIA", several things come up, not all of which are for TIAs.? And that doesn't include transimpedance amps that don't use the "TIA" abbreviation.
If you have a particular TIA model in mind, search our group for the model name to see if anyone else has used it already.
Andy
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Re: Build spice model of transimpedance amplifier
You asked about making a TIA model from scratch - but did you know that LTspice has some TIAs already?
Also, are you certain that the other manufacturers do not have SPICE models?? Some manufacturers make it challenging to find models when they are there.? Navigating websites has become challenging, IMO.
It is possible to make a generic TIA model, but probably not easy to make one that mimics characteristics of an actual part.? The answer depends on how closely you need the model to approach the actual part.? A generic model would lack things like nonlinear behavior.? Datasheets might not tell you enough about that.? But that's just my opinion.
Andy
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Build spice model of transimpedance amplifier
I want to build spice models of high speed transimpedance amplifier. There are many? op amps in LTspice simulation. However, I am looking for very high speed TIAs from other manufacturers. They have many but unfortunately there is no spice model. In that case, is it possible to make a spice model of the TIA from the scratch if they provide their datasheets?
Thank you very much.
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I found references for the?VOM1271, the other two I didn't find anything for now. From what I could see,?VOM1271?is very similar to FDA217, but?better documented.
--
Carlos Delfino Quem sou:?
Keybase (PGP): ORCID:?
Celular: ? ? ?(85)?985-205-490 (OI) - Aquiraz/CE ¡°Para o Triunfo do Mal, s¨® ¨¦ preciso que os homens de bem n?o fa?am nada¡± - Edmund Burke ¡°Ningu¨¦m comete erro maior do que n?o fazer nada porque s¨® pode fazer um pouco¡± - Edmund Burke
Conhe?a o Curso Maker (Arduino Minas): ? Arvore dos Saberes/Tecnologia no Social: ?
Em seg., 20 de mai. de 2024 ¨¤s 07:26, Mike Fraser via <mrfraser= [email protected]> escreveu: Carlos,
VISHAY makes a number of Photovoltaic MOSFET Drivers.
VOMDA1271, VO1263xx & LH1262xx.
They also have spice models available.
Some model files even include the .asy file,
All you need is to take the time and effort to search their web site.
Mike
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("AI Detector for ChatGPT, GPT4, Gemini") identifies the (first two) texts as
100% AI-generated (then I got bored). However, I don't think we need scribbr to tell us they're worthless :--)
LinkedIn thinks it has found a way for the AI copyright infringement barrier when attempting to scavenge
deep insights on specialized subjects. They might even have optimized out the 'prompt engineer.'
-marcel
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Re: Help converting UCC5304 simplis model into LTSPICE
On Sun, May 19, 2024 at 10:14 AM, eetech00 wrote:
On Sun, May 19, 2024 at 03:35 AM, Frank Muenchow wrote:
Thanks eetech00 for porting the model. Unfortunately there's a serious bug, it never works with common mode voltage. I tried a correction
/g/LTspice/files/UCC5304_model_test.zip
Good catch Frank..
I changed the A device "0" reference manually on the outputs but forgot about the inputs.??? :-|
I will update the model, noting your revision, and upload in a day or two.
eT
?Revised 2024/05/20 Model has been uploaded
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marcel wrote, "It is definitely written by a human being, because it consistently misspells 'LTspice" (even in the name of the group)."
That might be a mistake that an AI would make, after finding so many other things on the 'net where it is misspelled that way.
The choice in the group's name would have been one person's mistake.? It may have carried over to all the articles too.? Heck, it's even possible that the AI wrote the article spelling it "LTspice", which the group's owner then edited to introduce that error.? It's possible that all individuals involved in that article never actually used LTspice.
Andy
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It is definitely written by a human being, because it consistently misspells 'LTspice" (even in the name of the group).
-marcel
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4n25 is an opto or photo coupler. LED irradiating a light sensitive NPN transistor
fda217 is a photo voltaic isolator. LED irradiating an series array of photo voltaic cells?
They are two different types of components. They are used in a circuit differently
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cander shelter showed a link to an article at ""
There is considerable misinformation in that article.
It is not clear if the human(s) behind it know what they are talking about.? But I don't think it was written by a real living, breathing person.
The lack of any meaningful useful information suggests that it was written not to inform and educate, but to be clickbait.? It also says that it was written by an AI bot.? And we know what that means.
Andy
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Carlos,
VISHAY makes a number of Photovoltaic MOSFET Drivers.
VOMDA1271, VO1263xx & LH1262xx.
They also have spice models available.
Some model files even include the .asy file,
All you need is to take the time and effort to search their web site.
Mike
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On Saturday, 18 May 2024, 17:49:52 GMT+4, cander shelter via groups.io <hoopeer@...> wrote:
do LTspice have .Sens analysis (can perform the sensitivity analysis)?
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Yes, yes, I'm using it, but as I need to control a MOSFET, they suggested I switch to this other optocoupler as it would better solve the problem I'm facing. --
Em seg., 20 de mai. de 2024 ¨¤s 00:29, Andy I via <AI.egrps+io= [email protected]> escreveu:
I don't know if this helps, but are you aware that LTspice comes equipped with a 4n25 model?
Andy
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Leon show
eewiz
Tony Casey