LTspice (Linear Technology's tremendous free schematic capture & spice program). It would not help you to mix a simulation model with an Orcad design, anyway. The LTSpice dc-dc converters are 'hardcoded ' into the system for max. I don't think the.sub binary format that LTspice uses is publicly documented anywhere.īest Answer: It is not possible. I honestly don't know exactly what the.sub files are restricted to contain in LTspice, but the ones that come with the program are all binary files containing LT's proprietary models, some of which also make use of LT's extensions like and so forth. So I don't recommend doing this import procedure for MOSFETS I think it's only worth the hassle for ICs.

If you try that with your custom asy file, you get: Which for me is the most annoying part.

Furthermore, you can no longer change the MOSFET by right-clicking on it an picking a new model. And if you reinstall LTspice or load your schematic on a different machine, you have to do it all over again, never mind that it becomes less clear in the schematic what components you need extra libraries for.

But we don't need an.inc line anymore for the simulation to work: Honestly this procedure is usually not worth the hassle for me. Now you need to edit this ntk3139p.asy file either in a text editor or using LTspice itself (via Edit->Attributes or Ctrl+A) so that it reads: Now you can add the new component, but since we're using X as type it automatically get labelled as an IC ( U) rather than MOSFET as before. This.asy file is initially a copy of pmos.asy that comes with LTspice in this case. Program Simpan Pinjam Koperasi Gratis more. Create a ntk3139p.asy in LTspiceIV lib sym (or in one of its subfolders, in which case the component will show up in the corresponing category in the F2 select component dialog).Copy the aforementioned ntk3139p.lib into LTspiceIV lib sub this directory can contain both.lib and.sub files.

Ctrl-click to access the advanced properties page for the FET: This is actually explained in detail at And if you actually want to import that model into LTspice so that you don't have to use an.include statement, is What you need to keep in mind is to change the PMOS statement line to X (because it's a subcircuit) and match the name to the subckt name declared in that lib. How Much Is The Millenium Cabbage Patch Doll Worth. If I simply save that PSpice file to a ntk3139p.lib file and import it in LTspice, it all works fine: The Rds(on) looks in line with the for that part. I realize I could pick something else, but I wanted to take this opportunity to dive into some of the nitty gritty in spice. OnSemi provides a few spice models for this part and I am getting stuck converting the Pspice file so that it is usable in LTspice. I am designing a buck-boost regulator for a course at school and I would like to use the OnSemi ntk3139p PMOS transistor.

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