Hi Tony,

ok, many thanks

Suded

Hi Andy,

The example I got from Qspice forum for UCC27282 worked, I had to update Qspice to the latest version, there are few warnings but they are ignored and simulation is running and waveform window appears with the plots, I will try to regenerate the models/.SUCKT in the new version and run the simulation (Qspice)

Many thanks,

Suded

Hi Andy, Tony

I managed to run the schematic for synchronous buck boost converter (the same uploaded schematic) in Qspice after I updated it

Many thanks for your help

Best regards,

Suded

Suded,

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Another thing that I was thinking (but forgot to state here) was this:

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Since the problem seems to be that your QSPICE simulation was not picking up all the subcircuit definitions in TI's model, you could have loaded the full UCC27282 model file into your simulation, yourself.? Add this line:

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? ? .inc ucc27282.lib

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to the simulation and that would insure that the full set of subcircuits is brought into the simulation - even if QSPICE's model import process extracted only one of the subcircuits from the model file and ignored the other 48.

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But as should be clear by now, it was really unclear to me what was going on.? I really like to understand WHY something fails when it goes bad, not just to know that an update magically makes everything work.

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Andy

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I saw that you had entirely different errors from QSPICE that you described in the QSPICE forum, than the ones you said you were having, in this group.

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I have to wonder, what's going on?

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Why did you tell us you had an error about "PROP_DELAY" when there was no such text anywhere in your model?

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Why did you tell is you had errors about missing subcircuits here (COMPHYS_BASIC_GEN), but did not mention that in the QSPICE forum?? Over there, why did you say all the errors were about missing parameters and shorted resistors, but did not mention any of that here in this group?

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Sorry, but it somewhat ruins your credibility.

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Andy

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Hi Andy,

After I regenerated the model in Qspice and ticked the box that says include all the file, I stopped having this error:

Hi Andy,

When I updated Qspice to the latest version I was able to run the simulation example for UCC27282 sent to me from Qspice forum (not my own one but one uses half bridge only), so that drew me to the conclusion that i had to rebuild/resimulate my file with the updated version of Qspice , I want to mention here that I copied and pasted the model for UCC27282 from the example I was sent by Q form into my own simulation that makes two of UCC27282, also I used different MOSFETs (4 of them) which I got from Qspice built in library:

BSC070N10NS5

The rest I had to place my self, only at this point the simulation was ok and the waveform screen appeared, it gives you a set of errors but it overrides them and simulation runs smoothly!

I could not upload my simulation file to Qspice it says that I have to earn few badges to do that!

Regards,

Suded

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On Sun, Apr 20, 2025 at 08:41 PM, suded emmanuel wrote:

I could not upload my simulation file to Qspice it says that I have to earn few badges to do that!

It is kind of a "bummer" that Qorvo's QSPICE forum is like that.? New, first-time members there can't attach/upload their files.? On the one hand it makes some sense to stop new forum members from spamming them, but IMHO it makes little sense for customer support where first-time posters are the ones likely to need help with their models and schematics.? One hopes their settings are liberal enough to quickly overcome that hurdle.

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I guess it is one of the problems of corporate-run support.

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Andy

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Hi Andy,

I will try to post more there to earn some trust I guess!

Regards,

Suded