Pspice To Ltspice Converter Weight

• Pspice Model To Ltspice
• Pspice Vs Ltspice

I am designing a buck-boost regulator for a course at school and I would like to use the OnSemi ntk3139p PMOS transistor. 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 realize I could pick something else, but I wanted to take this opportunity to dive into some of the nitty gritty in spice. 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. 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. 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.

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Copy the aforementioned ntk3139p.lib into LTspiceIV lib sub; this directory can and does contain both.lib and.sub files. 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). This.asy file is initially a copy of pmos.asy that comes with LTspice in this case.

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. 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.

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 needed extra libraries for. Furthermore, you can no longer change the MOSFET by right-clicking on it an picking a new model.

If you try that with your custom asy file, you get: Which for me is the most annoying part. So I don't recommend doing this import procedure for MOSFETS; I think it's only worth the hassle for ICs. 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. I don't think the.sub binary format that LTspice uses is publicly documented anywhere.

Pspice Model To Ltspice

So I am having problems simulating a Single Phase AC/DC Dual Converter on LTSpice. At the first converter I am getting the perfect output but when I take the voltage probe from the second converter output I am not getting the expected voltage output. Frequency is at 60Hz, my load angle of the first converter is 60 deg and load angle of second converter is 120 deg. Circuit Implemented in LTSpice: The voltage output V(1) and V(3): You can see that V(3) waveform has a drop somewhere 5/6th of the way before its actual drop at 360-60=300 deg (13.89e-3 s).

It should be a complete inverse of V(1) with its conduction at 120 deg and 300 deg. I used a Thyristor model from a book called 'SPICE for Power Electronics and Electric Power' by Rashid, below is the sub-circuit:.SUBCKT SCRMOD 1 2 3. MODEL A K G (anode, cathode, gate) S1 1 5 6 2 SMOD RG 3 4 50 VX 4 2 DC 0V VY 5 7 DC 0V DT 7 2 DMOD RT 6 2 1 CT 6 2 10UF F1 2 6 POLY(2) VX VY 0 50 11.MODEL SMOD VSWITCH(RON=0.0125 ROFF=10E+5 VON=0.5V VOFF=0V).MODEL DMOD D(IS=2.2E-15 BV=1200V TT=0 CJO=0).ENDS SCRMOD I'm not sure what exactly is causing the problem on the second converter output. Can I get some help in figuring out what the exact problem is on the second converter? And yes I've done a transient simulation for a longer time, up to 2s but the V(3) output was consistent.

Pspice Vs Ltspice

I'm sure I have the correct model, I used a couple other SCR models from online obtained from the littlefuse website but the SCR Model from the book was better in simulating on LTSpice. Any help would be appreciated, Thank you.