You will not find those in an Orcad schematic. But you will them on your board and they will cause trouble! If you are new to dc-dc converters, I can only advise you to REALLY read the data sheet. And every application note you can find. And every book you can find.

Massobrio and P. Antognetti as a good reference for hspice vs PSpice device enhancements. The PSpice enhancements in that book can be used as an LTspice manual. And then on IBIS, No, IBIS isn't in LTspice. I think IBIS was an Intel invention that allowed them to give behavioral descriptions of their I/O pins without giving out implementation details.

I don't think the.sub binary format that LTspice uses is publicly documented anywhere.

Feb 22, 2011  I am interested in looking at signal and power intergrities. The only models that I have are the pspice and the TINA models. Does TINA work.? Is there anyway I can convert my spice model to a file type supported by pspice? Is there a converter in PSpice for Current to Voltage conversion in. I have an ABM part in PSpice. I want to convert this current output to voltage so it can. Oct 10, 2010  DCAC Converter simulation using Simple Model by LTspice.

And also, LTspice does not do the Philips MOS 9 device. As I recall, that model is now open sourced but it is in FORTRAN. Also, I should mention that a general rule is that LTspice does not do the hspice-specific semiconductor enhancements. You can use the 2nd edition of Semiconductor Device Modeling with SPICE by G.

They are not standard Spice models. It would not help you to mix a simulation model with an Orcad design, anyway. Analog simulation is not useful to simulate complete board level circuits and should not be used that way. At least I have never seen it being used that way successfully. Never mind what the shiny PSpice brochure says. They are mostly selling to the unexperienced. Pengajian jarak jauh ukm. You need to break out the part of your circuit that is of importance to you or that has a problem.

Best Answer: It is not possible. The LTSpice dc-dc converters are 'hardcoded ' into the system for max. Simulation efficiency.

Click to expand.[snip] Are you using PSpice 'raw', i.e. Without schematic capture? Both PSpice Schematics and Capture (gag me with a spoon) have the correct netlist TEMPLATE contained within the symbol. (Not that I should be one to criticize. I went for MANY years drawing schematics with pencil and paper, numbering nodes, hand-typing netlists, and batch-loading into Berkeley Spice 2G6 on an old VAX, IIRC, 1170. Then I discovered PC's and bought my first 386 for $6K.

• 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. Download game file iso untuk ppsspp. 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.

Maybe it's 'psice.ini' or 'msim.ini'. It's an undocumented feature. So we don't know that it will be forever in LTspice. Best regards, Helmut PS: I am not an employee of LT if that matters. LTspice/SwitcherCAD III is free SPICE with graphical user interface. There is an independent user group for LTspice. Original Message ----- From: 'analog' Newsgroups: sci.electronics.design Sent: Saturday, April 30, 2005 5:55 AM Subject: Re: Pspice to LTSpice/SwitcherCad schematic conversion?

Then you simulate several model levels of it (e.g. A linearized feedback model, an opamp model, a transistor level model) to understand how the mathematically ideal circuit behaves and how that differs from a component level model. Then you optimize your component values, try to estimate the performance you can expect, and compare the theoretically estimated surge currents, voltage peaks, power dissipation, noise, drift etc. To the simulation.

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 • Copy the aforementioned ntk3139p.lib into LTspiceIV lib sub; this directory can [and does] contain both.lib and.sub files.

He had been given an assignment to make a really simple dc-dc converter and he struggled with it for a year. I had tried several times to give him the right pointers, but they never caught on with him. I don't think he ever managed to understand theoretically how the circuits worked and which criteria he had to apply to optimize them for his particular application. It just shows that a simple switcher is not so simple if you need more than mediocre regulation, noise and efficiency. • Tell us some more • Upload in progress • Upload failed.

Jan 21, 2017  Hi all, I'm trying to find a suitable power fet to control a pulsed output. I found this Pspice model and thought I worked out how to convert it to LT.

Hallo 'analog', Thanks for this reminder. I had forgotten that I heared of it. Now I tried it a few minutes ago with 'example.sch' and I am deeply impressed! This has been a schematics from PSPICE 8.0. Ok, there is still a lot of manually rework necessary if it has to look professional, but it's a great starting point. I assume it only works with PSPICE8.0 schematics. Be aware to know where your PSPICE ini-file is located.

There are any number of important simulation issues in analog circuits that one can not address with the original design and where simulators like Spice allow to resort to different levels of modeling. And none of these levels will ever show up in your schematic.

And debugging a dc-dc converter with poor layout is nearly impossible. So you need to know beforehand what you are doing. A colleague in my company quit last year.

It reads in IBIS models (up to version 2.1) and generates an equivalent behavioural spice model. It's originally intended to generate a model compatible with Intusoft's spice, but can be configureed to generate models for other spices based on a template file. There's a templeate file available on the net somewhere to configure it for PSpice models.

Cheap because it was a clone.Jim Thompson.

Most probably it's 'C: windows msim_eval.ini'. I am not sure how this file is named for the full version. Maybe it's 'psice.ini' or 'msim.ini'. It's an undocumented feature.

Anyone know if there's an LTspice to PSpice Schematics converter? And vice versa? It seems it should be relatively easy to do. Both are text format.Jim Thompson -- James E.Thompson, CTO mens Analog Innovations, Inc. et Analog/Mixed-Signal ASIC's and Discrete Systems manus Phoenix, Arizona 85048 Skype: Contacts Only Voice:(480)460-2350 Fax: Available upon request Brass Rat E-mail Icon at 1962 AGW proponents are like watermelons. GREEN on the outside, RED on the inside.

UNAUTHORIZED * REPRODUCTION AND/OR DISTRIBUTION IS STRICTLY PROHIBITED. * * THIS PRODUCT IS PROTECTED UNDER COPYRIGHT LAW. * CREATED 2004, (C) COPYRIGHT 2004, TEXAS INSTRUMENTS * INCORPORATED, ALL RIGHTS RESERVED * * UNLESS THERE IS A SIGNED, WRITTEN AGREEMENT TO THE * CONTRARY, TEXAS INSTRUMENTS (TI) IS PROVIDING THE IBIS * MODELS AND WITHOUT ANY WARRANTY, EXPRESSED OR * IMPLIED. TI ASSUMES NO LIABILITY FOR: * 1) THE ACCURACY OF THE HSPICE MODELS PROVIDED TO YOUR * COMPANY; * 2) THE PROPER FUNCTIONING OF THESE HSPICE MODELS IN YOUR * DESIGN OR FOR ANY RESULTING APPLICATIONS; OR * 3) INFRINGEMENT OF PATENTS, COPYRIGHTS OR INTELLECTUAL * PROPERTY RIGHTS RESULTING FROM YOUR USE OF THESE HSPICE * MODELS. * * TI PROVIDES HSPICE MODELS AS A SERVICE TO OUR CUSTOMERS. * YOU AND YOUR COMPANY SHALL NOT DISTRIBUTE, SELL OR GIVE * THESE MODELS TO ANYONE ELSE WITHOUT PRIOR WRITTEN * PERMISSION FROM TI.

Is there a way to covert specialised component in LTSpice to PSpice? I'm doing a project that requires to use LT's Buck- Boost component (LTC3442), and since I have the main circuit in Orcad Capture, its practically impossible to redraw the entire circuit into LTSpice. Any idea to export the component so. Is there a way to covert specialised component in LTSpice to PSpice? I'm doing a project that requires to use LT's Buck- Boost component (LTC3442), and since I have the main circuit in Orcad Capture, its practically impossible to redraw the entire circuit into LTSpice. Any idea to export the component so that it can be use in Orcad, or converted into PSpice library?

Click to expand.Hallo 'analog', Thanks for this reminder. I had forgotten that I heared of it. Now I tried it a few minutes ago with 'example.sch' and I am deeply impressed!

Click to expand.There is no such thing as a TINA-specific model, likewise there are no PSpice-specific models. However there ARE HSpice-specific models, cooked up just so they can be ass-holes.

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I can't really vouch for the accuracy of the models it generates, and it's limited to IBIS version 2.1. Generally it would be a great feature to have in LTSpice, but I guess it's not a priority for LT's chip designers, IBIS tends to be used primarily by board designers for board level Signal Integity analysis. The above comments are from some years ago.

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So we don't know that it will be forever in LTspice. Best regards, Helmut PS: I am not an employee of LT if that matters. LTspice/SwitcherCAD III is free SPICE with graphical user interface. There is an independent user group for LTspice.

Anyway, I think IBIS amounts largely to an IV curve. The DC curve you can put in an IV lookup table. To do the dynamic behavior, you're better off with some kind of transistor level model of the device. Attached is an example of using a lookup table in a current source. I don't know if it's otherwise documented anywhere. Version 4 SHEET 1 880 680 WIRE -32 320 -32 288 WIRE -32 208 -32 176 WIRE -32 176 -160 176 WIRE -160 176 -160 208 WIRE -160 288 -160 320 FLAG -160 320 0 FLAG -32 320 0 SYMBOL current -32 208 R0 SYMATTR InstName I1 SYMATTR Value tbl(-5 -1 -2.5 0 0 1 1 5 2) SYMBOL voltage -160 192 R0 SYMATTR InstName V1 SYMATTR Value 0 TEXT -152 368 Left 0!dc V1 -5 5 1m But from someone else on IBIS and LTspice: I use a free utility from IntuSoft called IBIS2SPICE.

It won't usually be able to understand a '$' symbol as the start of a comment in-line. Usually this is enough to be able to run 3rd party foundry BSIM3 models without modification as long as all dimensions, areas, and perimeters are specified. LTspice development policy is that went there is a conflict between PSpice and hspice syntax, LTspice will follow PSpice because it a more widely used standard.