amp Wisconsin JoeWeadickanalogcom 847 6127983 LTspice XVII Basic Lab Class 1 Why Use LTspice Stable SPICE circuit simulation with Unlimited number of nodes Schematicsymbol editor ID: 935568
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Slide1
Joe Weadick (FAE, Illinois & Wisconsin)Joe.Weadick@analog.com(847) 612-7983
LTspice XVII Basic Lab Class
1
Slide2Why Use LTspice?Stable SPICE circuit simulation with:
Unlimited number of nodesSchematic/symbol editor
Waveform viewer
Library of passive devices
Fast simulation of switch mode power suppliesSteady state detectionTurn on transientStep responseEfficiency / power computationsAdvanced analysis and simulation optionsNot covered in this lab class (sort of)Outperforms or as powerful as pay-for toolsIn other words LTspice is free!Automatically builds syntax for common tasks
2500+
macromodels of Legacy Linear Technology products1500+ power products300+ Legacy ADI Products (power and amps)
LTspice is also a great schematic capture / BOM tool
SPICE = Simulation Program with Integrated Circuit Emphasis
Slide3How Do I Get LTspice and Documentation?
Go to
http://www.analog.com/LTspice
Left-Click on Download LTspice for Windows 7, 8 and 10
Follow the instructions to install
LTspice is a standalone application that runs on your computer
At this link, you will also find:LTspice Download LinksLTspice Demo CircuitsLTspice DocumentationLTspice Technical Articles & VideosSPICE Models
Slide4How Do I Get Started using LTspice?
Slide5How Do I Get Started Using LTspice?
Demo Circuits: Use one of the 100
’
s of demo circuits available at analog.com
Designed and Reviewed by Factory Apps Group
Go to http://www.analog.com/LTspice or browse through the part’s webpage for LTspice simulation informationJIG Files: Use a pre-drafted test fixture (JIG)Provides a good starting point, but is not production-readyUsed to prove out part models, and are not complete designsComponents are typically “ideal” components and will need to be modified based on your operating conditionsUse simulation circuits posted on the LTspice Yahoo! User’s GroupURL =
https://groups.yahoo.com/neo/groups/LTspice/infoAlso contains many very helpful discussion threads and tutorialsUse the schematic editor to create your own designLTspice contains models for most LTC power devices, opamps, and many moreADI opamp models are being added to the LTspice library (nearly 100 ADI models to date)LTspice can be used to simulate any analog circuit you can think of!
Slide6Demo Circuits at analog.com
Go to
http://www.analog.com/LTspice
and scroll down to the demo circuits section:
What if I
’m browsing the part’s webpage?
Slide7Demo Circuits at analog.com (cont.)
Go to the part’s webpage (LT8641 example):
Click on “Tools & Simulations” to find reference LTspice circuit(s)
http://www.analog.com/LT8641
Slide8What are Demo Circuits ?
LTspice demo circuits are designed and reviewed by the LTC factory apps group
It remains the customer
’
s responsibility to verify proper and reliable operation in the actual application.
Printed circuit board layout may significantly affect circuit performance and reliability.What if I cannot find a LTspice demo circuit ?
Slide9How Do I Get Started Using LTspice?
Demo Circuits: Use one of the 100
’
s of demo circuits available at analog.com
Designed and Reviewed by Factory Apps Group
Go to http://www.analog.com/LTspice or browse through the part’s webpage (right column)JIG Files: Use a pre-drafted test fixture (JIG)Provides a good starting point, but is not production-readyUsed to prove out part models, and are not complete designsComponents are typically “ideal” components and will need to be modified based on your operating conditionsUse simulation circuits posted on the LTspice Yahoo! User’s GroupURL = https://groups.yahoo.com/neo/groups/LTspice/info
Also contains many very helpful discussion threads and tutorialsUse the schematic editor to create your own designLTspice contains models for most LTC power devices, opamps, and many moreADI opamp models are being added to the LTspice library (nearly 100 ADI models to date)LTspice can be used to simulate any analog circuit you can think of!
Slide10Pre-drafted Test FixtureThese simulations / designs are not production-ready, but are a great starting point!
Used to prove out part models, and are not complete designsComponents are typically
“
ideal
” components and will need to be modified based on your operating conditionsIt remains the customer’
s responsibility to verify proper and reliable operation in the actual application.Printed circuit board layout may significantly affect circuit performance and reliability.
Slide11Opening a Test Fixture
1. Edit menu, select
“
Component”
2. Search for
macromodel
(ex. LTC3412A)
3. Click Here
Slide12Opening a Test Fixture
Voilà !
Slide13New Components in LTspice Library With AD, ADP, ADM, and ADuM Prefixes
Slide14How Do I Get Started Using LTspice?
Demo Circuits: Use one of the 100
’
s of demo circuits available at analog.com
Designed and Reviewed by Factory Apps Group
Go to http://www.analog.com/LTspice or browse through the part’s webpage (right column)JIG Files: Use a pre-drafted test fixture (JIG)Provides a good starting point, but is not production-readyUsed to prove out part models, and are not complete designsComponents are typically “ideal” components and will need to be modified based on your operating conditionsUse simulation circuits posted on the LTspice Yahoo! User’s GroupURL = https://groups.yahoo.com/neo/groups/LTspice/info
Also contains many very helpful discussion threads and tutorialsUse the schematic editor to create your own designLTspice contains models for most LTC power devices, opamps, and many moreADI opamp models are being added to the LTspice library (nearly 100 ADI models to date)LTspice can be used to simulate any analog circuit you can think of!
Slide15LTspice Yahoo! User’s Group
https://groups.yahoo.com/neo/groups/LTspice/info
Join the group here.
As of March 2019, there are over 69,000 members!
Several hundred message posts a month!
Slide16How Do I Get Started Using LTspice?
Demo Circuits: Use one of the 100
’
s of demo circuits available at analog.com
Designed and Reviewed by Factory Apps Group
Go to http://www.analog.com/LTspice or browse through the part’s webpage (right column)JIG Files: Use a pre-drafted test fixture (JIG)Provides a good starting point, but is not production-readyUsed to prove out part models, and are not complete designsComponents are typically “ideal” components and will need to be modified based on your operating conditionsUse simulation circuits posted on the LTspice Yahoo! User’s GroupURL = https://groups.yahoo.com/neo/groups/LTspice/info
Also contains many very helpful discussion threads and tutorialsUse the schematic editor to create your own designLTspice contains models for most LTC power devices, opamps, and many moreADI part models are actively being added to the LTspice library (nearly 100 ADI models to date)LTspice can be used to simulate any analog circuit you can think of!
Slide17Start With a New Schematic
To open up a blank schematic screen select
“
File
” Menu and “New Schematic”
Blank schematic
a.k.a.MasterPiece in progress
Slide18Using the Schematic Editor in LTspice
Slide19How to Wire up a Simple RC Circuit
The completed exercise:
Slide20Toolbar and Keyboard Shortcuts
Place Circuit Element
[F2]
Place Diode
[D]
Draw Wire
[F3]
Place Ground
[G]
Label Node
[F4]
Place Resistor
[R]
Place Capacitor
[C]
Place Inductor
[L]
Zoom In
Pan
Zoom Out
Autoscale
Paste b/t Schematics
[Ctrl+V]
Duplicate
[Ctrl+C]
Find
[Ctrl+F]
Delete
[Del]
Place SPICE directive
[S]
Place Comment/text
[T]
Mirror
[Ctrl+E]
Rotate
[Ctrl+R]
Redo
[Shift+F9]
Undo
[F9]
Drag
[F8]
Move
[F7]
Slide21How to Wire up a Simple RC Circuit
Step 1: Open up a blank schematic screen
Select
“
File” Menu and “
New Schematic”
Slide22How to Wire up a Simple RC Circuit
Step 2: Add the passives and grounds
Using the toolbar, select Resistor, Capacitor and Ground. Place these symbols on the schematic as shown below. Use
Ctrl+R
to rotate before placement.
Select and place res, cap & GND, or use keyboard keys R, C, and G
Tip:
Ctrl+R
to rotate before placement
Slide23How to Wire up a Simple RC Circuit
Step 3: Add the voltage source
Select
“
Edit
” Menu and “Component”. From the component window, start typing “voltage” in the dialog box, and click “OK”
1. Edit menu, select “
Component”
2. Type
“
Voltage
”
3. Click
“
OK
”
Slide24How to Wire up a Simple RC Circuit (cont.)
Step 4: Wire up the circuitUsing the toolbar, select Wire, or, press F3
1. Select
“
Wire
” button
Slide25How to Wire up a Simple RC Circuit (cont.)
Step 4: Wire up the circuit (cont.)
Left-Click ground
“Pull” wire up through the source
Left-Click here to anchor
“Pull” wire through the resistor
Left-Click here to anchor
“Pull” wire down through the capacitor
Left-Click here to anchor & finish
Hint: Press the ESC key at any time to clean up the schematic
Slide26How to Wire up a Simple RC Circuit (cont.)
Step 5: Add net labels
Using the toolbar, select Label Net (or press F4). Label the input/output nodes as shown below
1. Select
“
Label Net
”
2. Enter net name
3. Place on wire
Slide27How to Wire up a Simple RC Circuit (cont.)
Step 6a: Component values
Right-Click on each component symbol to change its value as shown below
Right-click on symbol
Or Right-click on value
Slide28Using Labels to Specify Units for Component Attributes
K = k = kilo = 103MEG = meg = 10
6
G = g = giga = 10
9T = t = tera = 1012M = m = milli = 10-3U = u = micro = 10-6
N = n = nano = 10-9P = p = pico = 10-12F = f = femto = 10-15
HintsUse MEG (or meg) to specify 106, not MEnter 1 for 1 Farad, not 1F
Slide29Editing Components
You can also edit the visible attribute and label by pointing at the text with the mouse and then right-clicking
Mouse cursor will turn into a text caret
Right-Click
on the component to edit attributes
Slide30Component Database
Resistors, capacitors, inductors, diodes, Bipolar transistors, MOSFET transistors, JFET transistors, Independent voltage and current sources
You can access a database of known devices
Slide31How to Wire up a Simple RC Circuit (cont.)
Step 6b: Source parameters
Right-Click on the voltage source and enter the parameters shown below under the
“
Advanced
” tab.
Right-click source
Click
“
Advanced
”
Slide32How to Wire up a Simple RC Circuit (cont.)Step 6b: Source parameters
Select the PULSE button and enter the parameters shown below:
Slide33Running and Probing a Circuit in LTspice
Slide34Summary of Hotlinks Used in This PresentationThe following hotlinks are used in this presentation for opening up LTspice simulation files
Note:
Presentation Mode must be used for the hotlinks to work
Class exercise
Solution to exercise
Circuits to explore at your leisure
Slide35Running the RC Circuit Simulation – Transient Analysis
With the RC circuit in the active window, click on the RUN button on the toolbar
The Edit Simulation Command window will appear. Set the Stop Time to 60m and click OK.
Using the mouse, click on the IN node and OUT node to display the input and output voltage waveforms.
Run
Click here for output waveform
RCFilterTimeDomain.asc
Slide36Running the RC Circuit Simulation – Transient Analysis
To add a measurement cursor to the waveform window,
left+click
the mouse on the waveform name.
Click to display measurement cursor. Click and drag cursor position.
To add a second measurement cursor (paired cursors), just
left+click
on the waveform name again.
RCFilterTimeDomain.asc
Slide37Running the RC Circuit Simulation – Transient Analysis
To display the current in the resistor, just
left+click
on the resistor.
Click here for resistor current waveform
RCFilterTimeDomain.asc
Slide38Running the RC Circuit Simulation – Transient Analysis
Split the plot pane by selecting “Add Plot Pane” under the Plot Settings pull-down menu.Drag and drop the I(R1) waveform title into the new plot pane
RCFilterTimeDomain.asc
Slide39Summary of the Waveform Viewer
LTspice integrated waveform viewer:Plot the voltage on any wire by a simple point and click
Plot the current through any component by clicking
on the body of the component
When using the current probe, the convention ofpositive current is from netlist pin #1 to pin #2.Add a waveform measurement cursor by left+clicking on the waveform name. Add a second measurement cursor by left+clicking on the waveform name again.
Voltage probe cursor
Current probe cursor
Slide40AC Analysis
Slide41AC Analysis Overview
Performs small signal AC analysis linearized about the DC operating point
Useful for analysis of filters, networks, stability analysis, and noise considerations
Slide42Simulating AC Analysis – RC Filter
Single pole filter using RC network
Syntax: .ac <
oct
,
dec, lin> <
Nsteps> <StartFreq> <EndFreq>Example: RC network and .ac dec 100 .01 1MEG
-3dB point: 1/(2*pi*R*C) = 159Hz
Right-click on .
tran
command and select
“
AC Analysis
”
AC amplitude of 1 sets magnitude to 0dB
Slide43Simulating AC Analysis – RC Filter
Right-click on the .
tran
command
Select AC Analysis tab
Enter the following parameters:
Slide44Simulating AC Analysis – RC Result
Click here for Bode plot
Slide45Simulating AC Analysis – Active Filter
Single pole active filter using an
opamp
(AD8672)
Click here for Bode plot
ActiveFilterACSweep.asc
Slide46Defining a Component Value as a Variable(a taste of intermediate & advanced topics)
Slide47Defining a Component Value as a Variable (Using Parameters)
The .
param
SPICE directive allows the creation of user-defined variables.
To define a component value as a variable, replace the component value with a variable name enclosed in curly braces. Example: {X}
Right+click to change the component value to {X}
Add the .
param
SPICE directive
(press S on the keyboard)
RCFilterACAnalysis_Param.asc
Slide48Defining a Component Value as a Variable (Using Parameters)
The simulation results are the same as when the component value was defined as 10K.
Click here for Bode plot
RCFilterACAnalysis_Param.asc
Slide49Defining a Component Value as a Variable (Stepping Parameters)
The .STEP command can be used to vary a component variable over a range of values to plot a family of curves.
This is very powerful and can be used for sensitivity and Monte Carlo Analysis.
Right+click
to change SPICE directive to the .step command
RCFilterACAnalysis_Step Command.asc
Slide50Defining a Component Value as a Variable (Stepping Parameters)
For this AC analysis example, the simulation result includes three Bode plots, one each for R = 10K, 20K, and 30K
Click here for Bode plot
RCFilterACAnalysis_StepCommand.asc
Slide51Running a DC/DC Converter Simulationand Analyzing Circuit Performance
Slide52Running a DC/DC Converter Simulation
Access the LTC3412A circuitClick File ---> Open, and navigate to the LTspice Lab folder on your desktop. Look for the file titled
“
LTC3412A_DC_Load.asc
”Or click “c” symbol on the right
LTC3412A_DC_Load.asc
Slide53Viewing Voltage Waveforms
Plot the voltage on any wire by
Left-Clicking
it
Tip: All Demo Circuits have INs and OUTs clearly labeled to help you quickly select them
Click here for output waveform
LTC3412A_DC_Load.asc
Slide54Viewing Current Waveforms
Plot the current through any component by
Left-Clicking
on the body of the component
Current flowing into a node is defined as being positive
Click here for inductor current waveform
LTC3412A_DC_Load.asc
Slide55Zooming In and Out on a Waveform
In the waveform window, use the mouse to zoom in and out. Click and drag a box about the region you wish to see drawn larger
Using the toolbar, click on
“
Zoom full extents”
, to zoom back out
LTC3412A_DC_Load.asc
Zoom Full Extents
Slide56Measuring V, I and Time in the Waveform
(Measurement Using Cursors)
Right-Click
on the waveform name in the waveform window
For
“Attached Cursor”, select “1st & 2nd” Position cursors to make desired measurements
1.
2.
3.
Result
LTC3412A_DC_Load.asc
Slide57Measuring V, I and Time in the Waveform
(Measurement Using Zoom Window)
Drag a box about the region you wish to measure
Left-Click
, drag, and hold
View the lower left corner of the window for the status bar. The dx and dy
measurement data is displayed here.Use Undo from the File menu or press “F9”
LTC3412A_DC_Load.asc
Slide58Viewing Differential Voltage Waveforms
Left-Click
on one node and drag the mouse to another node
Red voltage probe at the first node
Black probe on the second
LTC3412A_DC_Load.asc
Slide59Viewing Differential Voltage Waveforms
To create a measurement reference node,
Right-Click
on the desired node and select “Mark Reference”
A black voltage probe is anchored to the selected node
All measurements in the circuit are now referenced to the node with the black probe Hit the ESC key to remove the reference markLTC3412A_DC_Load.asc
Slide60Viewing Wire Current Waveforms
Plot the current through any wire by
Alt+Left-Clicking
on the wire
An ammeter will appear to indicate that the wire current will be displayed
LTC3412A_DC_Load.asc
Slide61Average & RMS Calculations
Average & RMS Current, Voltage, or Power Dissipation
Calculated only for the visible area of the plot window
Click on inductor L1 to display the inductor current waveform
Ctrl+Left-Click the I(L1) trace label in the waveform view
Example:Measure average and RMS current for inductor in LTC3412A circuit. Zoom in as shown for this waveform.
LTC3412A_DC_Load.asc
Slide62Instantaneous & Average Power Dissipation
Instantaneous Power Dissipation
Alt+Left-Click
on the symbol of the LTC3412A
Waveform is displayed in units of Watts
Average Power Dissipation Click, hold, and drag in the waveform window to display waveform at steady stateCtrl+Left-Click on the Power Dissipation Trace Label in the waveform viewWaveform summary window will appear which shows power dissipation in the IC
Example:
Measure the power dissipation in the LTC3412A IC
LTC3412A_DC_Load.asc
Slide63Deleting Waveforms
Method #1: Right-Click on a trace label to be deleted
Select “Delete this Trace”
Deletes only the selected trace
LTC3412A_DC_Load.asc
Slide64Deleting Waveforms
Method #2: If the plot window is active hotkey F5 is equivalent
Cursor turns into scissors
Left-Click
on one or more trace labels to delete. ESC to quit
LTC3412A_DC_Load.asc
Slide65Deleting Waveforms
Method #3: Plot the same waveform twice in succession
Deletes all but that waveform
Click, click
LTC3412A_DC_Load.asc
Slide66Net Labeling
Slide67Advantages of Labeling
Replaces the default SPICE node names with node names and waveform titles that are easy to understand and remember
Allows LTspice circuit nodes to match those on your production schematic, i.e.
“
TP15
”
Without
With
LTC3412A_DC_Load.asc
Slide68Labeling - Trick
Highlight net from waveform viewer
Alt-Left-Click on the label in the waveform viewer (i.e. V(n006)) and it will now highlight that particular net on the schematic. You can also use the search function ( )
Net Highlighted
Alt-Left-Click
LTC3412A_DC_Load.asc
Slide69Generating a BOM and Efficiency Report
Slide70BOM
Under View select Bill of Material
Displayed on Diagram
Paste to Clipboard
LTC3412A_DC_Load.asc
Slide71Steps to Computing Efficiency
Note: Efficiency will only be calculated in the steady state condition
1.)
Right-Click
the .tran
statement on the schematic to bring up the Edit Simulation Command dialog box2.) Check the box “Stop simulating if steady state is detected” …
1. Simulate menu, select “Edit simulation Cmd”
2. Check Box
LTC3412A_DC_Load.asc
Slide72Steps to Computing Efficiency
3.) Load must be a current source or a resistor labeled Rload**
4.) Run the simulation …
The Good
The Bad
This will be treated just like any other resistor – efficiency will read
ZERO
Slide73Steps to Computing Efficiency
5.) Upon completion select the View dropdown menu, Efficiency Report, then Show on Schematic
6.) Efficiency report will be pasted under the schematic
LTC3412A_DC_Load.asc
Slide74SMPS Efficiency Tips
LTspice will not always be able to determine steady state, but this is rare!
Workaround:
Alt+Left-Click
on individual component and integrate waveformProbe the various nodes and verify the circuit is stabilizedIf not, edit the .tran statement and increase the Stop Time parameter. Re-run simulationFor multiple output and/or multiple input supplies, efficiency must be determined partially by hand from the efficiency report
Alternatively use behavioral modelsRight-Click any component will report power dissipation if steady state has been detected or Mark Start/End has been usedIf circuit has stabilized for a long time and LTspice still hasn’t detected the steady-stateUse Mark Start/End (Simulate pull-down menu ---> Efficiency Calculation ---> Select Mark Start/End)Only steady-state data is displayed before Mark End
Slide75Simulating a Transient Response
Slide76Current Load and Pulse Function
You can simulate a load with a Resistor or Current (active) load
In particular, the Pulse function with a current load is helpful for transient response analysis
Steps a current load from one load value to another load value
LTC3412APulseLoadSolution.asc
Slide77Edit the Current Load to a Pulse FunctionEdit the .
tran directive in the LTC3412A simulation to disable steady state detectionRight-Click
on the current load
Select
“Pulse”Modify the attributes (see below). Click “OK”
*
Forces current to be zero when voltage is zero
Slide78Run the Simulation for Transient Response
Run the simulation
Click on the OUT node to display
Vout
Click on the output current load to display
IoutNotice the presence of the pulse loadUse the application of the pulse load / transient response to verify stability and modify the compensation components as necessary.
LTC3412APulseLoadSolution.asc
Slide79Importing Third Party SPICE Models
Slide80Importing Third Party SPICE Models
Steps for importing a third-party SPICE model:
1.) Download the
SPICE
model file from the manufacturer’s website
2.) Place the
SPICE model file in the same directory as the LTspice simulation file (simplest). It can be placed in another folder on your computer or even on a network drive.3.) Open up the SPICE model file and note the device name4.) Add the following SPICE directive to the LTspice simulation schematic (Edit pull-down menu ---> SPICE Directive): .include spice_model_file_name.abc
5.) Modify the device name on the LTspice schematic to match the device name listed in the SPICE model file (Right+Click on the device name on the simulation schematic and modify accordingly).
Slide81Importing Third Party SPICE Models
The following items are
CRITICAL!
1.) The file name in the .include statement must match the
SPICE
model file name identically! The file name syntax is can be anything, just make sure that all of the characters match.
2.) The device name on the LTspice simulation schematic must match the device name in the SPICE model file identically! The device name syntax can be anything, just make sure that all of the characters match.
Slide82Importing Third Party SPICE Models
SPICE Model Example #1:
File name = 1N5244B.mod
Model name = 1N5244B1
SPICE Model Example #2:
File name = Joe.txt
Model name = Everest
Summary:
The file and device names are irrelevant. Just make sure that the LTspice simulation device name and .include file name match those of the SPICE model file.
Slide83Importing Third Party SPICE Models
Hands-on Exercise:
1.) Navigate to the LTspice Training Files folder
2.) Open up the simulation file titled “Zener Import
Example.asc
”
3.) Open up the SPICE model file titled “1N5244B.mod” and note the device name.4.) Modify the simulation file so that it uses the 1N5244B third-party SPICE model based on the instructions provide on the previous slides5.) Run the simulation and probe the IN and OUT nodes
Slide84Importing Third Party SPICE Models
Solution:
1.) Zener name changed to 1N5244B1 to match device name in the SPICE model file.
Right+Click
on the diode name text to change.
2.) .include SPICE directive added to link to the SPICE model file. Use the Edit pulldown menu -
--> SPICE Directive to add this SPICE directive to your simulation.3.) Result after clicking on the Running Person symbol on the toolbar and probing the IN and OUT nodes.
Slide85Steps:
1.) Download the AD8237 SPICE model from the ADI website
2.) Open up the AD8237 SPICE model using LTspice
3.) Use LTspice to autogenerate the schematic symbol (right-click on the .SUBCKT statement)
4.) Wire up the circuit
Importing Third Party SPICE Models: Practical Example Using AD8237
Slide86Autogenerated Schematic Symbol:
Importing Third Party SPICE Models: Practical Example Using AD8237
Slide87Final Implementation:
Importing Third Party SPICE Models: Practical Example Using AD8237
Slide88More Information and Support
Slide89ADI / LTC Design Tools That Autogenerate LTspice Simulation Circuits
1.)
LTpowerCAD
http://www.analog.com/LTpowerCAD
2.) Analog Filter Wizard
http://www.analog.com/designtools/en/filterwizard/
3.) Photodiode Circuit Design Wizard
http://www.analog.com/designtools/en/photodiode/
Slide90Reminder to Periodically Sync Release It is important to sync your release of LTspice periodically to get the latest updates
Software updates and bug fixesModels
Sample circuits and examples
Tools pull-down menu ----> Sync Release
**May need to run LTspice as administrator or run “Elevated”
Slide91Reminder to Periodically Sync Release (Windows) Vista, Win7, and Win8 users (any UAC-enabled OS)
You must “Run as administrator
”
LTspice.exe or its shortcut even if you are logged in as an administrator
Slide92Reminder to Periodically Sync Release (Mac)
1. Open
“
Control Panel
”
2. Under
“
Operation
”
3. “
Sync Release
” for Mac
Slide93Built-in Help System
Slide94Appendices
Slide95Other ResourcesLTspice forum: Use simulation circuits posted on
LTspice Yahoo! User’s Group
Go to
https://groups.yahoo.com/neo/groups/LTspice/info
Also contains many very helpful discussion threadsEducational Files: Check out LTspice capabilities using the education examples Available on C:\Program Files\LTC\LTspiceXVII\examples\EducationalLTspice videos: Video tutorials by Linear’s technical staff
LTspice Videos at www.analog.comLTspice Videos on YouTube!https://www.youtube.com/results?search_query=ltspiceLTwiki: Undocumented features …http://ltwiki.org/Wurth LTspice Book – available at Amazon, or, contact your local Wurth field sales engineer
Slide96Other Resources – Educational Files
Design examples demonstrating LTspice capabilities
Slide97Other Resources – LTwiki
http://ltwiki.org/
Slide98Other Resources
– LTspice
B
ook
Other Resources – LTspice Book
Slide99Appendix - Steps to Calculate Power Supply EfficiencyEfficiency will only be calculated in the steady state condition
Right-Click the .tran statement on the schematic to bring up the Edit Simulation Command dialog box
Check the box
“
Stop simulating if steady state is detected”Load must be a current source or resistor labeled RloadRun the simulationUpon completion select the View dropdown menu, then Efficiency Report, then Show on SchematicEfficiency report will be pasted under the schematic
Slide100Appendix – Summary of Special Mouse and Keyboard CommandsSchematic-Based Special Commands
Alt-Left-Click on a wireThis will display the waveform for the current flowing in the wire
Alt-Left-Click
on a component
This will display the instantaneous power dissipation in the componentCtrl-Right-Click on a componentAllows you to edit embedded component attributesWaveform-Based Special CommandsCtrl-Left-Click on a waveform titleDisplays the average and RMS values for the waveformLeft-Click on node and drag to another node
Displays differential voltageAlt-Left-Click on the label in the waveform viewer (i.e. V(n006))Particular net on the schematic is highlighted
Slide101Appendix – Summary of Additional FeaturesPause a simulation
“Simulate”
pull down menu ---> Pause
There is no toolbar button for this function
Zoom in/out using the schematic editor:Just use the wheel on your mousePan around a schematicLeft-Click-Hold the mouse, then dragTilt wheel to move right and leftMove a window to another monitor (new to LTspice XVII)Right-Click on window contents, then from the context menu check box “Float Window”Left-Click-Hold the window title bar to drag to another monitor
Slide102Thank you for attending, and happy simulating!
Homework:
Once you return to the office, go back over the training materials within a week!