LTspice Basics. A set of simple simulation exercises to start using LTspice. These will be very helpful for first time users. I have used LTspice XVII. Download the latest version of LTspice from their website to try out the simulations. I have uploaded a PDF of the steps to be followed for each simulation, and the final. The 555 Timer - Oscillator. CIRCUIT 555TIMER1.CIR Download the SPICE file. Let's look at the king of IC timers - the 555 Timer. A versatile part that can function as a one-shot, a free running oscillator, or a number of other functions. This classic circuit embodies just a few stages. SIMULATORS TwisterSim. TwisterSIM is a unique Electro-Thermal simulator that helps shorten the design solution cycle by enabling, in a few clicks, complex engineering evaluations with accurate simulations like load-compatibility, wiring harness optimization, fault condition impact analysis, diagnostic behavior analysis and Dynamic Thermal performance.
≡ PagesFavoritedFavorite12Introduction to LTspice
Linear Technology provides useful and freedesign simulation tools as well as device models. This tutorial will cover the basics of using LTspice IV, a free integrated circuit simulator.
Getting Started
To download LTspice IV for Windows click here, and for Mac OS X 10.7+ click here. Linear Technology updates these packages so check the website for updates. I linked the executable because this is the version I will be using for the tutorial.
Note: For Ubuntu Linux users, you can look into using a Wine derivative called PlayOnLinux. One of our customers tested it out with Ubuntu. You can check out their forum post for more information.
Here are some installation guides for PlayOnLinux:
Here are some installation guides for PlayOnLinux:
Once you open an instance of LTspice IV check out the video below to see how to get started navigating through the menu, setting your schematic and waveform preferences, adding a new schematic, placing parts and organizing your schematic and finally running a simple DC operating point on a voltage divider.
Helpful Hints
Hot keys and Simulator Directives - Make your life easier with shortcuts. The Simulator Directives are your Dot commands. I suggest you look through these very carefully in the HELP menu in LTspice. The help menu will show you the syntax and give descriptions for each one. Specific commands will be covered one-by-one in future videos. If you are having trouble getting one or more to work please head over to the forum.
Labels- Turn to page 23 to see how to label values such as using 8k instead of 8000.
Simulation: Transient Analysis
A time domain transient analysis is where a parameter such as a voltage or current is plotted against time. If you are looking at an output you can see the behavior over a specified length of time. For this example we are going simulate the output of a half-wave rectifier. For this type of analysis we will cover how to add an AC signal source to your schematic and choose a specific diode.
Simulation: AC Analysis
Ac analysis provides the frequency response of your circuit. The output waveform will be a bode plot showing you the amplitude and phase across a specified frequency range. There are several options with AC analysis. You can view frequency response as a bode plot, on the Cartesian coordinate plane with the real and imaginary axis and you can view it as a Nyquist plot.
We are going to build a passive, first order, low-pass filter and see what information can be obtained about the circuit from the plot.
Simulation: DC Sweep
A DC Sweep is a type of simulation that allows you to vary the voltage or current of a specified device. On all schematics of SparkFun's parts we give you a voltage range for which the product can safely operate. I thought it would be a good idea to check a Sparkfun product to see just how accurate those voltage ranges are. For this example we are going to look at the Electret Microphone Breakout Board.
Simulation: Noise
Noise analysis let you view the noise inherent in your system as well as injected noise from outside source when modeled properly. Noise is most commonly concerning in op-amp circuit where precision is everything. Icon utrack pro drivers for mac. For example, a battery management system using op-amps to sense the current. Charging cycles of rechargeable batteries as well the load current are very important parameters to monitor for the overall health of the battery and safety of the user. A noisy op-amp circuit may skew that current reading and cause unwanted effects such as incorrect current readings on the microcontroller which keeps the battery from being over or under current. I'm sure an audio example would have been better to use here. But you get the idea, noise can be bad when it is unwanted.
We are going to continue using the pre-amplifer circuit from the Electret Mic Breakout Board and run a noise analysis. LTspice can model the [shot, flicker and thermal](https://en.wikipedia.org/wiki/Noise_(electronics) noise your circuit.
Simulation: DC Transfer
The DC Transfer function calculates the low frequency gain and the input and output resistances of your circuit. Continuing with the Electret Mic Breakout Board product as our example we can first compute the transfer function. We know that the output voltage is biased at 1/2 the input voltage. Since the Transfer function describes the behavior of the output as a function of the input and we can say the transfer function should be equal to 1/2. If we choose VCC to be 5V then Vout is 2.5V. This circuit should have low output impedance because we want op-amps to operate like ideal voltage sources. This ensures maximum power is delivered at the output giving your ADC the best values. The closer the output impedance is to zero the better. Similarly we want the input impedance to be high as to not draw current from the source. Let's sim the transfer function and verify it has been designed accordingly.
Creating a New Model
There are several steps to create your own model in LTspice. A model consists of a subcircuit and a symbol. For an example, we are going to build a model for a potentiometer. It will be based off the SparkFun 10k trimpot. A few months ago I designed a soldering kit for personal use based off the 555 timer. LTspice does not come with a standard potentiometer so we will build one. Most of the time simulating a trim-pot as a resistor is fine. But I plan on giving this kit to new students of electronics and want them to understand the difference between a resistor symbol and its use and a potentiometer symbol and how it is used in this circuit.
See the video below to create your own potentiometer model in LTspice. https://bara-no-sabaku-drama-cd-bl5.peatix.com.
Adding Third Party Models
There are many ways to import third party models into LTspice. I have found one particular method to be the fastest and easiest for importing models and subcircuits. Eventually, I will add another video on the Forum on how to do this other ways. If you have a way that works for you, please share on the forum. If you are having trouble using a specific method just ask on the forum and I will respond with a video.
Resources and Going Further
- Check out the new forum for LTspice! Here you can ask questions, post solutions, get example circuits from the tutorial, see new videos every week and find a community for LTspice. I know that there are many forums out there for LTspice but there is something awesome about a fresh forum.
- Here are some video tutorials put on by Linear Technology.
- The LTspice Getting Started Guide from Linear Technology.
- This list will be updated periodically.
For all of these components, place the subcircuit and the component in their respective folders, then restart LTspice. The component will then show up as a menu selection.
An LTspice Standard Library Replacement
The whole library replacement / addition as one zip file Place in libcmp as a replacement, or carefully extract what you need (Suggested)
Browse or Search on what is in this zip file, and extract what you need
standard.bjt
standard.dio
standard.jft
standard.mos
standard.bjt
standard.dio
standard.jft
standard.mos
A Large LTspice Folder from Bordodynov
Bordodynov has kindly shared his entire LTspice folder with tons of parts and examples.
The whole library replacement with additions plus tons of examples as one zip file - about 33 MEG.
See Screen Shot of files removed from the collection containing AEI SPICE Models
These AEI models were removed because of possible copyright violations. However, search on the internet for these models. They are available.
For example AD8331 models are Available HEREAD8332 hereAD8099 hereMC34063 here
This entire zip file has been expanded so you can view the contents, and it will be available to search engines.
You start by opening folders here:
LTspiceIV-library (Directory Style - Drill Down)
LTspiceIV-examples (Directory Style - Drill Down)
Vendor_List (Directory Style - Drill Down)
Mixed_Part_List (Directory Style - Drill Down)
A note on portability of these 'permanent' LTspice Components:
Many comments are made about the lack of portability of creating these permanent parts in LTspice. The approach preferred by most is to include the symbols and SPICE models directly in the folder of the schematic you are testing. PLEASE NOTE that using this method to create permanent LTspice models does not prevent this portability! Create your permanent part, or add the parts from the list below. When you share this schematic with others, or use it on a computer that does not have this component, just copy the 'asy' file and its associated SPICE reference to the 'asc' file you are providing to the foreign computer.
In this way, you can have the best of both worlds: You can build up a permanent library of useful parts, immediately accessible when you create a circuit AND you have portability!
CFL Circuit
13 Watt 120 VAC Compact Fluorescent
Entire Zip file unzip to its own folder(hierarchical example).
Files Below - Click to view as text, Right Click and Save As to download individually.
CFL.asy
CFL.lib
GE13W120V_CFL.asc
winding.asy
Xfrmr.lib
A good study of the CFL, and excellent use of good layout technique and use of LTspice. Thanks a.s.
Some explanation:Before the arc strikes the series resonant circuit is nearly unloaded and, if the arc did not start, would gradually climb in voltage to whatever the open circuit Q of the resonant tank is times the input voltage. This could take quite a few cycles at the resonant frequency. Q will be limited by the loss in the end electrode heater windings and the resonant inductor. This sort of start does not immediately jump to a high voltage.
Files Below - Click to view as text, Right Click and Save As to download individually.
CFL.asy
CFL.lib
GE13W120V_CFL.asc
winding.asy
Xfrmr.lib
A good study of the CFL, and excellent use of good layout technique and use of LTspice. Thanks a.s.
Some explanation:Before the arc strikes the series resonant circuit is nearly unloaded and, if the arc did not start, would gradually climb in voltage to whatever the open circuit Q of the resonant tank is times the input voltage. This could take quite a few cycles at the resonant frequency. Q will be limited by the loss in the end electrode heater windings and the resonant inductor. This sort of start does not immediately jump to a high voltage.
The conductivity of the CFL depends on the level of ionization of the gas in the tube, which in turn depends on the power per unit length of arc. As the current increases, heating and ionization builds, leading to a thicker, lower resistance arc. This is why the arc exhibits a negative incremental resistance -- increased current leads to a larger diameter arc.
However, at some point, the narrow cross section of the CFL tube limits further conductivity modulation, leading to saturation and to the arc voltage increasing rather than decreasing with increasing current (positive resistance). I would guess that this effect occurs only at damaging levels of current, but that is only a guess.
End effects, cathode fall (larger) and anode fall (smaller) tend to be quasi-fixed voltages that don't depend too much on current in the normal operating range.
Arc conductivity depends on ionization, which depends on average power input. The simplest model for this is to low pass a behavioral source set up with its output proportional to arc power. Note that this thermal averaging effect is what is responsible the arc appearing as a positive resistance at high frequency (the ions stay hot and conductive for a while even if the current goes to zero).
Download Ltspice
Comparators
LM339
File:LM339.sub LM339 subcircuit. Place in libsub
File:LM339.asy LM339 component. Place in libsymComparators
File:LM339 test.asc Test circuit using the native LM339. You may want to use the alternate solver.
Datasheet
File:LM339.asy LM339 component. Place in libsymComparators
File:LM339 test.asc Test circuit using the native LM339. You may want to use the alternate solver.
Datasheet
Diodes
Leaky Schottky Diode BAR43
Leaky Diode Model for LTspice Right Click and Save As to download
Datasheet for BAR43
Datasheet for BAR43
The model in the zip file is for the BAR43 Schottky Diode, but also shows the use of temperature dependence of reverse leakage, and fairly well follows the datasheet.
Soft Recovery Diode
Soft Diode Model for LTspice Right Click and Save As to download
MOSFET Drivers
VOM1271
File:VOM1271.sub VOM1271 Photovoltaic MOSFET Driver model subcircuit. Place in libsub or in your subdirectory
NMOS
2N7002
File:2N7002.sub 2N7002 subcircuit. Mosiac photo book for mac. Place in libsub
File:2N7002.asy 2N7002 component. Place in libsymnmos
File:2N7002 test.asc Test circuit using the native 2N7002 You may want to use the alternate solver
Datasheet
File:2N7002.asy 2N7002 component. Place in libsymnmos
File:2N7002 test.asc Test circuit using the native 2N7002 You may want to use the alternate solver
Datasheet
BS170
IRFB4110pbf
IRFB4110 subcircuit Place in libsub
File:IRFB4110pbf.asy IRFB4110 component. Place in libsymnmos
File:Irfb4110 test.asc Test circuit using the native IRFB4110. You may want to use the alternate solver.
Datasheet
File:IRFB4110pbf.asy IRFB4110 component. Place in libsymnmos
File:Irfb4110 test.asc Test circuit using the native IRFB4110. You may want to use the alternate solver.
Datasheet
IRLR3110
IRLR3110 subcircuit Place in libsub
File:IRLR3110.asy IRLR3110 component. Place in libsymnmos
File:Irlr3110 test.asc Test circuit using the native IRLR3110. You may want to use the alternate solver.
Datasheet
File:IRLR3110.asy IRLR3110 component. Place in libsymnmos
File:Irlr3110 test.asc Test circuit using the native IRLR3110. You may want to use the alternate solver.
Datasheet
MGSF2N02ELT1
MGSF2N02ELT1 subcircuit Place in libsub
File:MGSF2N02ELT1.asy MGSF2N02ELT1 component. Place in libsymNMOS
File:MGSF2N02ELT1 test.asc Test circuit using the native MGSF2N02ELT1. You may want to use the alternate solver.
Datasheet
File:MGSF2N02ELT1.asy MGSF2N02ELT1 component. Place in libsymNMOS
File:MGSF2N02ELT1 test.asc Test circuit using the native MGSF2N02ELT1. You may want to use the alternate solver.
Datasheet
NPN Darlington
TIP142
File:TIP142.sub TIP142 subcircuit. Place in libsub
File:TIP142.asy TIP142 symbol. Place in libsymDarlington
File:TIP142-test.asc Test circuit using the native TIP142
DatasheetAdapted from Yahoo LTspice Group Message 28586
File:TIP142.asy TIP142 symbol. Place in libsymDarlington
File:TIP142-test.asc Test circuit using the native TIP142
DatasheetAdapted from Yahoo LTspice Group Message 28586
Opamps
LM2902 - National Semiconductor
LM324 - National Semiconductor
LM324 subcircuit Place in libsub
File:LM324-national.asy LM324/NS component. Place in libsymOpamps
File:LM324-national test.asc Test circuit using the native LM324. You may want to use the alternate solver.
Datasheet
File:LM324-national.asy LM324/NS component. Place in libsymOpamps
File:LM324-national test.asc Test circuit using the native LM324. You may want to use the alternate solver.
Datasheet
LM6132A - National Semiconductor
File:LM6132A.MOD LM6132A subcircuit. Place in libsub
File:LM6132A-national.asy LM6132A/NS component. Place in libsymOpamps
File:LM6132A test.asc Test circuit using the native LM6132A. You may want to use the alternate solver.
Datasheet
File:LM6132A-national.asy LM6132A/NS component. Place in libsymOpamps
File:LM6132A test.asc Test circuit using the native LM6132A. You may want to use the alternate solver.
Datasheet
LMH6642 - National Semiconductor
File:LMH6642.MOD LMH6642 subcircuit. Place in libsub
File:LMH6642.asy LMH6642 symbol. Place in libsymOpamps
File:LMH6642 test native.asc Test circuit using the native LMH6642. You may want to use the alternate solver.
Datasheet
File:LMH6642.asy LMH6642 symbol. Place in libsymOpamps
File:LMH6642 test native.asc Test circuit using the native LMH6642. You may want to use the alternate solver.
Datasheet
THS4131
THS4131 subcircuit Extract ths4131.txt & place in libsub
File:THS4131.asy THS4131 component. Place in libsymOpamps
File:THS4131 test1.asc THS4131 test circuit, using native THS4131
Datasheet Original files created by Helmut Sennewald at [1].
File:THS4131.asy THS4131 component. Place in libsymOpamps
File:THS4131 test1.asc THS4131 test circuit, using native THS4131
Datasheet Original files created by Helmut Sennewald at [1].
TL072
File:TL072.sub TL072 subcircuit. Place in libsub
File:TL072.asy TL072 component. Place in libsymOpamps
File:Pweoverdrivepreamp2.asc Overdrive Preamp circuit, using native TL072
Datasheet Original files adapted from [2].
File:TL072.asy TL072 component. Place in libsymOpamps
File:Pweoverdrivepreamp2.asc Overdrive Preamp circuit, using native TL072
Datasheet Original files adapted from [2].
PMOS
![Ltspice free download Ltspice free download](https://i.stack.imgur.com/uF0Hn.png)
BS250
Si7489DP
File:Si7489dp.sub Si7489DP subcircuit. Place in libsub
File:Si7489.asy Si7489DP symbol. Place in libsymPMOS
File:Test-Si7489.asc Test circuit using the native Si7489DP. You may want to use the alternate solver
Datasheet
File:Si7489.asy Si7489DP symbol. Place in libsymPMOS
File:Test-Si7489.asc Test circuit using the native Si7489DP. You may want to use the alternate solver
Datasheet
SiA431DJ
File:SiA431DJ.sub SiA431DJ subcircuit. Place in libsub
File:SiA431DJ.asy SiA431DJ symbol. Place in libsymPMOS
File:Test-Sia413dj.asc Test circuit using the native SiA431DJ. You may want to use the alternate solver
Datasheet
File:SiA431DJ.asy SiA431DJ symbol. Place in libsymPMOS
File:Test-Sia413dj.asc Test circuit using the native SiA431DJ. You may want to use the alternate solver
Datasheet
PNP Darlington
TIP127
File:TIP127.sub TIP127 subcircuit. Place in libsub
File:TIP127.asy TIP127 symbol. Place in libsymDarlington
File:TIP127-test.asc Test circuit using the native TIP127
Datasheet
File:TIP127.asy TIP127 symbol. Place in libsymDarlington
File:TIP127-test.asc Test circuit using the native TIP127
Datasheet
Power Factor Corrector
UC3853
UC3853 subcircuit Place in folder of circuit file (hierarchical example).
File:UC3853.asy UC3853 symbol Place in folder of circuit file.
File:UC3853.asc UC3853 hierarchical subcircuit Place in folder of circuit file.
File:UC3853 Test.asc UC3853 test circuit.
Above files in one download
Datasheet
Great example creating a model from spec sheets (courtesy of analogspiceman)
File:UC3853.asy UC3853 symbol Place in folder of circuit file.
File:UC3853.asc UC3853 hierarchical subcircuit Place in folder of circuit file.
File:UC3853 Test.asc UC3853 test circuit.
Above files in one download
Datasheet
Great example creating a model from spec sheets (courtesy of analogspiceman)
Solar Panel Subcircuit
2 cell solar panel complete with test circuit
Voltage Regulators
TL431
File:TL431.sub TL431 subcircuit. Place in libsub
File:TL431.asy TL431 component. Place in libsymVoltage Regulators
File:TL431 test.asc Test circuit using the native TL431
Datasheet
File:TL431.asy TL431 component. Place in libsymVoltage Regulators
File:TL431 test.asc Test circuit using the native TL431
Datasheet
An excellent TL431 model, with comparisons to other models
TL431.zip - an improved model for TL431
See a useful discussion here, 'Realistic SPICE model for TL431'.
TL431.zip - an improved model for TL431
See a useful discussion here, 'Realistic SPICE model for TL431'.
Compilation
NEW UPDATED VERSIONLtSpiceIV_Plus_12_2009.exe
LTspicePlus_10_08.exe
Roberto Hugo Rodríguez Zubieta in 2005 created this executable, that provides a large number of extra components. First, backup your existing /lib/cmp directory at a minimum, and you may find it easy to just zip your entire /lib directory down. This executable will overwrite /Lib/Cmp with many more components that is based a dated version of the LTspice originals. The existing files are put into a folder /Lib/Cmp/Original. The dated version is not a problem. From LTspice, under 'Tools', selecting 'Sync Release' will restore all of the new models in the latest libs from LTspice. (At least every one I could see, using a Diff program.) Plus now you have many more.
LTspicePlus_10_08.exe
Roberto Hugo Rodríguez Zubieta in 2005 created this executable, that provides a large number of extra components. First, backup your existing /lib/cmp directory at a minimum, and you may find it easy to just zip your entire /lib directory down. This executable will overwrite /Lib/Cmp with many more components that is based a dated version of the LTspice originals. The existing files are put into a folder /Lib/Cmp/Original. The dated version is not a problem. From LTspice, under 'Tools', selecting 'Sync Release' will restore all of the new models in the latest libs from LTspice. (At least every one I could see, using a Diff program.) Plus now you have many more.
The rest includes more than 90 files in the format *. sub, to denote that they contain subcircuits of devices or *. lib, for the files that contain families of components. This information is added to the folder /sub and it doesn't overwrite any original data. To the folder /sym is added several subfolders with files corresponding to more than 400 symbols.
![Ltspice model library Ltspice model library](https://softsolder.files.wordpress.com/2012/12/ne555-pulse-generator.png)
In the folder examplesLtSpicePlus, there are more of 600 clever examples to be run, these are mainly in format *. asc, although there are also some few ones in format *. cir; plus in this collection there are also near 100 symbols in format *. asy.
The install is in Spanish! The product result is in English. If you come across some 'Replace' options, etc, be prepared to Google some Spanish words to make sure you know what you are selecting. It's a 3.5MEG download.
If you don't speak Spanish, try those instructions:
- say 'Aceptar' (Accept).
- Point the 'Carpeta de Destino' (Destiny Folder) parameter at your LTSpice install-folder, normally it is C:Program FilesLTCLTSpice IV, but it will vary (e.g. in a Portuguese version of Windows it will be 'C:Arquivos de Programas'.).
- If it complains about 'Los siguinentes ficheros ya existen' (The following files already exist), choose what you consider to be most adequate: Sí/No (Yes/No), 'Sí a todo/No a todo' (Yes to replace all/Replace nothing at all) or 'Renombrar' (Rename). It's your choice, I'd say 'yes' after checking if filesizes are similar (i.e. a library you already have).
- The extraction will run, it takes a while (lots of files). If finishes correctly and doesn't give any error, probably all went well, try some examples just to be sure.
Roberto has Spanish documentation and tutorials using LTspice at Precisión, guía para desarrollos con Ltspice. Icse mathematics books download.
Someone wants to build an updated version of this? Contact Roberto: precisionorte -at- gmail.com and he can help get you started.
555 Timer Ltspice Model Download For Android
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