I have needs for these file too. I use them in the usual way, but I get an error. Please help.
File in temp richies-test-file-IKW25N120H3.asc

OK ,? I have them?
Thanks !

Go to Files....> temp....> scroll down to the files you want, or search on the top right field.
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Udo

Thanks,?
I am not familiar , where is this temp folder ?

Hi,
I will upload IKW25120H3.asy and .lib files to the temp-folder.
The files are for 1200V 25A IGBT's.
Should be possible to get also the files fo the 30A type.
----
Udo

Hello, does any boby have an example of IGBT model ??
No obvious to find !
I am looking for a fast 1200V 30A Igbt .
I can find the WIKI link??? but does help much?
Thanks

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Hi Andy,
Thanks for pointing that out.
YES, I missed the missing dot (.) in front of the "options plotwinsize=0"
I will blame the oversight on the highly acute and superior vision, which seems to devlop as our age progresses.
Mike

John,

Here is a follow-up to yesterday's mention of the spurious stuff at 3.33 Hz (and odd harmonics) that was about 80 dB below the fundamental.

It's an artifact.? It's not in the signal.

I am not positive yet, but I think it is an interaction between the FFT's re-sampling of the waveform (into 262144 points), and the risetime of the Gate signal.? I think the resampling around the fast risetime?shifts slowly over the simulation interval, resulting in false 3.33 Hz spurs.

I am confident that there is no 3.33 Hz in the waveform itself.? It's just the FFT doing what it does.? In effect, we have aliasing, between the FFT's sample rate and the frequency content from the gated signal's rising edges.? If you push the FFT harder, the spurs go way down and are lost in the mathematical noise.

Maybe you didn't care, but since you noticed the spurs, I thought it was fair to say what they are.

Andy

Mike, maybe you missed it, but I answered John already.? John wrote "options" instead of ".options".? That turned it from a dot-command to a lossy transmission line, and gave us the error.

Andy

Hi John,
I do not know why this works.
I changed the commands on the schematic to include more precision.

John,

The command-line you tried to add was "options plotwinsize=0".? That.s OK, except that it is missing the leading period.? So, LTspice sees it as an attempt to add an O-device, which is a Lossy Transmission Line and needs 4 nodes.

Indeed it might not be a helpful error message, but that's because LTspice can't second-guess you and understand that "options" should have been ".options" and not a legitimate circuit component.? Sometimes it's the subtle things we miss.

There's nothing wrong about giving it a PWL that lasts longer than the simulation does.? You could have made it only 30 ms long and added REPEAT FOREVER ... ENDREPEAT around that.??But I think your PWL has a mistake.? The 5th positive pulse, and every 4th positive pulse after it, is not a rectangle, it's a triangle.? Plot V(gate) and run the simulation for 300 ms to see it.? I think that's because the repeating sequence starts and ends at different voltages, starting at 1 V and ending at 0.5 V.? So it "wraps around" with a triangular step from 0.5 V to 1 V.

You could replace your PWL source with PULSE (0.5 1 0 10u 10u 9.99m 30m) and I think it would do what you want.? But that's assuming that it really is periodic every 30 ms, which you imply it might not be.

I think your PWL misses the first point at 0 sec in each REPEAT because it coincides with the previous one's last point at 120 ms.? I think the REPEAT causes the ends to splice EXACTLY together, with first and end points being coincident.? I think it sees it as if the PWL has:
? ?... 100.01m 0.5 120m 0.5 120m 1 130m 1 ...
As you can see, that thas two PWL points at exactly 120 ms.? I think it uses the first and ignores the second one.? So you probably need to end your repeating sequence with a point at 0.5 V slightly before 120 ms, followed by 1 V at 120 ms.? Either that, or make the sequence start at 0.5 V and jump immediately to 1 V.

Andy

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Thanks, Andy. I have uploaded '3-cycle sine symmetry.asc'. To see the waveforms, simulate for 120 ms. You may tell me that I don't need to specify the PWL for as much as 120 ms, but that raises an awkward question about the truth of '3-cycle', and I don't want to go there.

I looked at the netlist and can see nothing to trigger the 'Missing node' warning. I quite agree with you that plotwinsize should not produce this warning. The warning appears on the schematic screen. The error log just reports 'Fatal error; missing nodes'.

I am pretty sure that the "Missing node(s)" warning is not related to the ".options plotwinsize=0".? I can't see any way that one would cause the other.

Any chance of uploading the schematic?

It's possible that the appearance of the "Missing node(s)" warning also points to the command or element line that caused it.? The warning might appear right below the offending line -- or perhaps two lines down from it, since LTspice may need to see the next line, before it realizes that node(s) are missing.

Andy

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I am now looking at another control method that changes the amplitudes of successive half-cycles of the sine wav, in the sequence 1,0.5,0.5,1, 0.5,0.5,1,0.5,0.5,1,0.5,0.5. I made a PWL voltage source to give me that and multiplied it by the 50 Hz sine wave to get the controlled waveform. Much to my surprise it worked. BUT (there is always a BUT)? if I include options plotwinsize =0, I get a 'Missing node(s)' warning. Not a helpful one.

Yes, this is a "known" problem, and it's been known for a rather long time.? It was before Tony's message in 2022.? I don't recall exactly when it was first discussed in this group. but it was quite a while ago.? LTspice used the defective JFET models from Linear Systems (Linear Integrated Systems) starting pre- or early-COVID.? It was not only updates where you got the bad models, you got them even just by installing LTspice XVII.

? ? "It looks like a transcription error made by someone at ADI, ..."

Actually, I believe the error was made by someone at Linear Systems.? See below.

ADI was not innocent.? They accepted the bad models without questioning them.

Linear Systems has (good) SPICE models of most of their JFETs.? You can find links to them on the webpage for each JFET, and those models are OK.? But at some point, someone at Linear Systems merged all the JFET SPICE models together into one file, and that was when the mistake happened.? Then they shipped the merged file off to ADI for inclusion in LTspice.

The biggest problem is the Kf noise parameter.? I'm guessing that the person who merged them had not seen numbers that small before (e-18).? Probably through recklessness, he altered them.? e.g., "Kf=45.61E-18" morphed into "Kf=45610f" which made it one million times larger!? Maybe he thought he was being "clever" by changing from scientific notation into a letter multiplier, but he went the wrong way, moving the decimal point in the wrong direction!? (As you can tell, I am only guessing.)

ADI could have made a thorough check, testing every JFET model in the file on a handful of test jigs, but that's a lot of work and hardly anyone does .NOISE analysis anyway.? I'm guessing ADI assumed the Linear Systems models must be OK, so they were incorporated into LTspice without question.

? ? "Can you share the "good" jfet models or point me to where I can find them?"

The "good" Linear Systems JFET models are here:??Go to Linear Integrated Systems's website??and look up a JFET in the product selector.? Go to that JFET's page.? Most of their part webpages have a link to THAT one part's SPICE model.? These individual SPICE models are OK.? (Yes, there are questions about some of the other parameters in some of the models, but at least the Kf parameter is "OK".)

If you find a link on Linear Systems's website to download all their JFET SPICE models in one file, stay away from that one!? It is the "smoking gun".

Bordodynov has many SPICE models where he has tweaked them to fit measurements.? Trust his models.

Andy

Can you share the "good" jfet models or point me to where I can find them?

Thanks?

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I have written about this several times in this group, starting with #138735. I have also complained to ADI about it a number of times. All to no avail.

It seems that the general problem with the affected models is that the Kf parameter in standard.jft is 1e6 times bigger than the same model available directly from Linear Systems. It looks like a transcription error made by someone at ADI, or whoever they have outsourced the standard libraries to.

My files are tools and one should take care of them.

I always do a backup of my stuff before updating, but I haven't updated in a long time, because wouldn't of they done it right the first time?