LTspice IV Getting Started Guide
Contents
1. zoom in e Left click and hold as drag a box about the region you wish to zoom in then release zoom out e Right click and select Zoom uu c NU a to Fit or Zoom Back cUm F jLinear Technology SwitcherCAD 5V 12V 250mA 1372 asc 1 Wew Window Smulate Bl QAR Elid 4 7 LP Zoom In Pan Zoom Out Autoscale Measuring Rippe and Time Frequency Drag a box about the region you wish to measure peak to peak over a period Left click and hold to drag a box over the portion of interest View the lower left hand side of the screen e avoid resizing shrink your box before you let go of the left mouse click or use the Undo command in the Edit menu 4 Linear Technology LTspice SwitcherCAD III LTC3411 raw Sele View PlotSettings Simulation Tools Window Help jae AT QQQR EU ES 8044 To view SMPS voltage ripple you will need to zoom into a narrow section since waveform is initially compressed to full range 2011 Linear Technology Average RMS Current or Voltage Calculations Hold down Ctrl and left click on the or V trace label in the waveform viewer Technology L dce SwitcherCAD ixi T Be I ASS kA MWavetormm us rus 4015 6015 HIS R g2. 7 Linear lechnology LI spice switcherCAD NI L16C3411 asc Edt Hierarchy Simulate Tools Window AS MP FH JAM AS 2 3 SD OO write to wmf file Se he AUS a D br St Ste eine aac FIT ee are eee 2011 Linear Technology Built in Help System Left Click on Help menu and then Help Topics E uua LL _ Schematic Colors The menu command Tools gt Color Preferences colors allows you to set the colors used in displaying the schematics You click on an object in the sample schematic and use the red green and blue sliders to adjust the colors to your preferences CEE E E DEC CORTE LORS LEIDEN Note Non electrical graphical annotations made to schematics such as lines and circles will ba draw in the chlo r Am A Terent Optica A J i 2011 Linear Technology Emailing Comments and Signing up for Linear Insider Fille View Tools Help By ae el ea Help Topics F1 Ea Ri out LT spicefSswitcherlAD About LI spicefswitcherCAD Il x 7 Version 2 11 Aug 10 2004 10 06 11 Click here to e mail comments and bug reports to scad3telinear com Click here to visit Linear s website www linear c
3. Sync ths rity proper and rallabls o operation In tha sctusl Component substitution and printed eirewitt board tapout may signifika atfact cireutt performance or Contact al sals representative Tor s amp sistanca This Is distributed to customers only far RETI Da Copyright 2005 Linear Technopogy ing All reserve 2011 Linear Technology Voltage Differences Across Nodes Left click and hold on one node and drag the mouse Edt View Simulate Took Window Help to another node AS ES BA Red voltage probe at the first node L1 D1 10 at Black probe on the second J 2011 Linear Technology Plot Planes Multiple plot panes can be displayed on one window to allow better separation between traces permitting different traces to be independently autoscaled e Right click in the waveform pane Select Add Plot Pane Left click and hold to drag a label to a new plot pane Fj Linear Technology LTspice SwitcherCAD III astable asc YT View Took Window Help i x B EX LOPA AS r 5 0m ff LUMA 2 0m ms LY MIS Zooming In and Out in the Waveform Viewer We es TITI T1371 ED x Window ep
4. Schematic Editor Toolbar Ws om Enter root part to search for the model e g 3411 Left click on Open this macromodel s D LTC34UBB 2 LTC3410B 1 2 LTC340 LTCSATUB 1 875 this macromodel s test LTC3411 LTC3407 2 LTC3411 To run a test fixture jump to the hun ana 1 eas Probe a Circuit LTspice section _ m 2011 Linear Technology Getting Started using LTspice IV Use one of the 100s of demo circuits available on linear com Reviewed by Linear Technology s Factory Applications Group Use pre drafted test fixture JIG e Provides a good starting point Use the schematic editor to create your own design LTspice contains macromodels for most LTC power devices 2011 Linear Technology Draft a Design Using the schematic Editor Copyright 2011 Linear Technology All rights reserved Start with a New Schematic New Schematic OL Techn SwitcherCAD III 5 12V 25 1372 asc Window Simulate Edt B u al SAR BSS Left click on the New Schematic symbol in the Schematic Editor Toolbar 2011 Linear Technology Add a Linear Technology Macromodel Add Component LoT inear Technology SwitcherCAD III 5V 12V 250mA 1372 asc Ele View Window Simulate Edit Help HEIN alus AE ajajaa EE XI Left click on the Component symbol in the Schematic Editor Toolbar E
5. Started using LTspice IV Use one of the 100s of demo circuits available on linear com Reviewed by Linear Technology s Factory Applications Group Use a pre drafted test fixture JIG Provides a good starting point Use the schematic editor to create your own design LTspice contains macromodels for most LTC power devices 2011 Linear Technology Pre Drafted Test Fixture JIG Used for testing models during development Provides a draft starting point Not reviewed by Linear Technology s factory applications team IT near oai oi NET iR 4 Edt yem existe Toca Window Hei pee FS SE SSW REPA DS ESP DO 0 IM 1000p _ 43K R3 4 2011 Linear Technology Start with a New Schematic New Schematic OL chnr SwitcherCAD III 5 12V 25 1372 asc Window Simulate Edt B E al z lala el Elia BAR Tal Left click on the New Schematic symbol in the Schematic Editor Toolbar 2011 Linear Technology Add Macromodel amp Opening Test Fixture Add Component F iLinear Technology SwitcherCAD III 5V 12V 250m4A 1372 asc E M 10 x 4 View Window Simulate Edit Help 18 AlS 3 AS alle IN OUT Left click on the Component symbol in po UU the
6. t Schematics Place Comment Find Place SPICE directive 2011 Linear Technology O LINEAR Run and Probe a Circuit Copyright 2011 Linear Technology All rights reserved Simulation Commands To run a simulation specify the type of analysis to be performed here are six different types of analyses Transient analysis DC sweep Noise DC transfer function DC operating point Simulation commands are placed on the schematic as text e Called dot commands 2011 Linear Technology LINEAR Editing Simulation Commands eft click on Simulation menu Leftclick on Edit Simulation Cmd As a starting point in a simulation Left click on Transient tab Enter a Stop Time e You may need to adjust this again later Select OK 2011 Linear Technology Edit Simulation Command Perform a non linear time domain simulation Step Time Time to Start Saving Data 1 M aximum Timestep EE Start external DC supply voltages at Stop simulating if steady state is detected Don t reset when steady state detected Step the load current source __ Skip Initial operating point solution Syntax tran options option tran lu startup Cancel Running a Circuit Fi Linear Technology LIispice rtcherCAD LTC3411 asc File Edit Hierarchy Simulate Tools Window Help dowIM ELLE ESI Sat Ha g
7. the effiaenzy report at the bottom of the schemabc 2011 Linear Technology oimulate a Transient Response in a SMPS Advanced Topic Copyright 2011 Linear Technology All rights reserved Use a Pulsed Function as a Transient Response Load Insert a current source load e Left click on the Component symbol in the Schematic Editor Toolbar Select load or load2 circuit element and configure as pulsed Left click on OK Configure load as a pulsed function covered next Steps current from initial to pulsed value and back Run and review results ET a EB 2 E UCM 4 amp ne pH ms res B EU SAV teem 49243 5 PME Brit 2011 Linear Technology Configuring Load as a Pulse Function Right click on the load or load2 DES Select Pulse Modify the Attributes 11 Initial value 12 Pulsed Value delay Delay r Rise time f Fall time Ton On time period Period Ncycles Number of cycles Omit for free running 2011 Linear Technology none PULSEN 12 Taala Ton Period CO SINE offset lamp Freg Td Theta Hcycles CO EXPN L2 Tdi Tau Tau Small magna AC AC gt SFFMilell Lamp MOI Fsg AC Amplitude neo AC Phase W212 Maka this info
8. vsus piad alate debeched L 1 i E i i i a i 1 I 1 1 i i i 1 1 1 1 i a 1 i i Skip Intl operating pont schon 4 d TU lo O UMBRAL BEAG PLN IRAM insanum cum a Kieti ah cT um Ha ER icai es c ceptioro options hn Tim ife id Enter Eat or SEXT cum DE 2011 Linear Technology Viewing Efficiency Report Left click on Simulate menu Left click on Efficiency Report linear e Eun el Switchert AD M L BET EE Lud im 5x amp Zoom area c Fat thee CO Zoom Back H i A L RE Zoom to Fit i 22222120222 __ Efficien F show Gr xir Efficiency 83 1 F Pine 02 m pt WEIN o i Output 997mW gi999mV 020000020 LE pa of Materials ee an T dhi ah ct Efficency Repot on deme 3 A SPICE Netist Paste to cipboard Cpi By spice cree beg mm visible Traces Om LIMCCLLIE T Dissipation Om 2 Du ut 142mW M Window Tabs Pent
9. Be Aynenponoug Step Down DC DG Converter H simmutstion model Is rotTound phass Synch Ralesss tremalns the customers responsibility to verity proper and rilab operation In tha zctust spplicstio Component substitution and printed zirzutt brard may signiFicanthy attect clreuit parforrnmca or ralia Contact our local raprasentatma Tor sssistanes This circuit I5 distriputad to customers ont for use with LTE parts Copyright 2005 Linear Technology Ing All rights reserved If model is not found please Sync Release under Help menu to update LTspice 2011 Linear Technology e py Bwitci vert II LT df si aix few Zmu ste Took Window Hep 7 8988 ESS rus Probing a Circuit amp Waveform Viewer Left click on any wire to plot the voltage on the waveform viewer Voltage probe cursor Left click on the body of the component to plot the current on the waveform viewer Convention of positive current is in the direction into the pin Current probe cursor 2011 Linear Technology Probing a Demo Circuit and Test Fixture Demo Circuits and Test Fixtures have INs and OUTs clearly labeled to help you quickly select them o view the waveform left click on IN and OUT F j Linear Technology LTspice SwitcherCAD III LTC3411 asc Edit Hierarchy View Simulate Tools Window Help models found pl ss
10. L Tspice IV Getting Started Guide Copyright 2011 Linear Technology All rights reserved Benefits of Using LT spice IV Stable SPICE circuit simulation with Outperforms pay for options Unlimited number of nodes Schematic symbol editor Er M Waveform viewer Library of passive devices Fast simulation of switching mode power supplies SMPS Steady state detection Step response Efficiency power computations Advanced analysis and simulation options Not covered in this presentation 2011 Linear Technology How Do You Get LT spice IV Go to http www linear com LTspice Left click on Download L T spice IV Register for a new MyLinear account to receive updates if you have not done so already Tspice Download LTspice Iv Update October 8 2011 Lispice is a high performance SPICE simulator schematic capture and Users Guide waveform viewer with enhancements and models for easing the simulation of Lispice Getting Started Guide switching regulators Our enhancements to SPICE have made simulating switching Using Transformers in LTspice IV regulators extremely fast compared ta normal SPICE simulators allowing the user to view waveforms far mast switching regulators in just a few minutes Included in this download are LTspice M Macro Models for 60 af Linear Technology s switching regulators aver 200 amp models as well as resistors tra
11. am Click here to join the Linear Insider e mail list Copyright 1388 1999 2000 2001 2002 2003 2004 Linear Technology Corporation All rights reserved Display version num 2 Author Mike Engelhardt 2011 Linear Technology Customer Support Linear Technology customers can obtain support by Calling your local field applications engineer http www linear com contact Calling 1 408 432 1900 for factory application support e Additional support not related to Linear Technology circuits or models support Built in help topics amp User Manual Independent LTspice users group search messages 2011 Linear Technology LINEAR Independent LTspice Users Group group has a section of files and messages with additional tutorials libraries and examples htto groups yahoo com group L TI spice Join LTspice Users Group Email LTspice subscribe yahoogroups com Subscribe ipten ethan th mre Su echar CAD EET dos 5 FICE pra ra hi aille freu af c ues en es lla xri rn in ar iai un dcm peru mal with Lina Techaso hat 2011 Linear Technology
12. art Humber 5 elect Resistor Resistor Properties Resistance EM Power R atingi 2011 Linear Technology inductor L1 Manufacturer Part Humber OO1608P 222 Select Inductor Show Phase Dot Inductor Properties Inductance H Peak Current Series Hesistance c Parallel 1 Parallel Lapacitance F Series resistance defaults to 1mc2 Capacitor Cp1 Manufacturer Fart Humber select Capacitor Capacitor Properties CapacitancelF Voltage A atingi AMS Current Hatina A Equiv Seres Hiesistance c Equiv Series Inductance H Equiv Parallel Hezistance c2 Equiv Parallel Lapacitance F Mean Time Between Fallures hr Parts Per Package Use Labels to Specify Units in Circuit Elements Attributes K k kilo 10 m M milli 10 meg 10 u U micro 10 10 nano 10 T t terra 1012 p pico 10 12 f femto 1075 2011 Linear Technology Circuit Elements Database Some components have an available database of manufacturers attributes Resistors capacitors inductors diodes Bipolar transistors MOSFET transistors JFET transistors Independent voltage and current sources configure a component to a manufacture s attributes Right cl
13. ear website For datasheet Cancel Adding Circuit Elements Place Inductor Mirror Place Diode Rotate Place Capacitor Place Resistor Technology SwitcherCAD III 5 12V 250m4A 1372 asc L UNE EAE CO S QAR ea 71 55 2 Left click on the desired component in the Schematic Editor Toolbar Left click on Rotate or Mirror to adjust orientation Alternate you can also use Ctrl and Ctrl M key shortcuts Move the mouse to the position you want to place it Left click to place it 2011 Linear Technology eur RES A 4n Bis m F sw 4 7 pP Left click on the Component symbol in the Schematic Editor Toolbar Search directory structure for desired circuit element e g load and voltage Left click on OK Move the mouse to the position you want to place it Left click to place it 2011 Linear Technology Additional Circuit Elements Like Sources and Loads 2 c 3 o e Gla OUT Top Directoy CAPROGRATALTCXSwCADITIINDA sym 11 D CAPROGRATALTCASWCADIIINIbNsgem 3 MICI FerrteB ead Highlights of Additional Circuit Elements Left click on the Component symbol in the Schematic Editor Toolbar for a directory of additional circuit elements Arbitrar
14. ice TC3411 Demo Circuit 1 254 4MHz Synchronous Step Down Converter 3 3V to 1 0 If you do not find a demo circuit of Step 3 If LTspice Iv does not automatically open after clicking the link above vau can instead run the simulation by right clicking an the link and selecting Download Demo Circuit Save Target As After saving the file to your computer start LTspice and open the demonstration circuit by selecting Open fram the File menu To explore other ready ta run LTspice demonstration circuits please visit aur Circuits Collection 2011 Linear Technology LTICAD Demo Circuit Designed and Reviewed by Factory Apps Group T Linear Technology LTspice 5SwitcherCAD LTC3411 asc File Edit Hierarchy View Simulate Tools Window Help Sey ana run demo circuit jump fes to the Run and Probe a Circuit in LTspice section simulation models Mot Toa nat pees 7 h gt romaine tne customers mper and paration In tha 2 applicetion component utestrtutkon and printed arrul board layout may significantly attect clreult pertormarea or ME our glas raprasa Tor mca This circuit Ie distributad to customers ont for use with LTC parts Copyright amp 2695 Linear Technopgoegy Inge AN rights regarvedl 2011 Linear Technology Getting
15. ick on the component symbol Left click on Select or Pick New Left click on a selected device Leftclick on OK 2011 Linear Technology Inductor L1 Manufacturer Coilcratt Part Number DIT BSOBP 227 i Select Inductor Show Phase Dot Inductor ties uctance H Current Cancel a Voltage V Rse Q A IPLIHR4 MAH 50 0 3 300 E Al electrolytic 147 M 50 0 Al electrolytic LIPR2 amp R47MAF 100 0 4 H 500 SRIAIOE 10 0 1 C1608 CO603C105K8P C3216x7RIC10 1 0 AVX T m TAJATO5K016 1 0 KEMET C 805C105K4R Editing Voltage Sources and Loads Voltage Source Right click the voltage Voltage Source V2 symbol Enter DC voltage value and optional Series Resistance Left click on OK Load current Right click on the load Current Source 11 symbol value Enter DC current value Left click on OK 2011 Linear Technology oummary of Schematic Editor Toolbar Place Circuit Element Place Diode Place Inductor Place Capacitor Place Resistor Label Node Place Ground Draw Wire F ilinear Technology SwitcherCAD III 5V 12V 250mm A View Window Simulate Edt l AST 3 3 IN SA 2 Ath Move Drag Undo Redo Delete Rotate Duplicate Mirror Paste b
16. maalion visible on schematic 7 5 0 7 This in an load 57 Triselz 100n Thalia 100 01m 2m 1 Make the riomahon subis on schematic Tdelay needs to be adequate so that the device Is in steady state and out of startup before the load step occurs Simulate a Transformer Advanced Topic Copyright 2011 Linear Technology All rights reserved simulating a Transformer Draw each winding of the transformer as an individual inductor Couple inductors with a mutual inductance statement Add a SPICE directive of the form K1 L1 L2 L3 1 to the schematic Left Click on Edit then SPICE Directive e Inductors in a mutual inductance will be drawn with a phasing dot Start initially with a mutual coupling coefficient equal to 1 K statement coupling Transformer with two windings the windings K1L1L21 ies eae 100 900u 1 3 turns ration gives Note winding inductance ratio is a 1 9 inductance ratio the square of the turns ratio 2011 Linear Technology Additional Information and Support Copyright 2011 Linear Technology All rights reserved Reminder to Periodically Sync Release Update your release of LTspice to get the latest Software updates Models and examples Sign up for Linear Insider via MyLinear www linear com for email news and updates
17. nsistors and Harl 2 MOSFET models Follow on Twitter 4 Demo Circuit Collection View Upcoming LTspice seminars View the LTspice Video Channel 2011 Linear Technology Getting Started Copyright 2011 Linear Technology All rights reserved Getting Started using men IV Use a pre drafted test fixture e Provides a good starting point Use the schematic editor to create your own design LTspice contains macromodels for most LTC power devices 2011 Linear Technology Demo Circuits on linear com OVERVIEVV Go to http www linear com Enter root part number in the search ORDER INFO box e g 3411 SIMULATE Select Simulate Tab on the left side S Follow the instructions provided PACKAGING TECH SUPPORT Simulate Lispice Vis a powerful fast and free simulation tool schematic capture and waveform viewer with enhancements and models for improving the simulation of I Ex switching regulators To download LTspice W and other FREE simulation tools Interest use a pre drafted test please visit aur Design Simulation page fixtu re next To launch a ready tu run LTspice demonstration circuit far this part Step 1 If you have notinstalled an this computer download and install Tsnice Iv Step 2 oncel Tspice is installed click an the linkisi below to launch the simulatian Down load L sp
18. nt Cick to edit expression Contro Left Click to ntegrate 2011 Linear Technology 4 LINEAR Instantaneous amp Average Power Dissipation Instantaneous Power Dissipation Hold down the ALT key and left click on the symbol of the component Pointer will change to a thermometer Plotted in units of Watts Average Power Dissipation Hold down the Ctrl key and left click on the trace label power dissipation waveform Left dick to plot D1 dissipation V SW OLUT D1 2011 Linear Technology 5 Q Generating a BOM and Efficiency Report Copyright 2011 Linear Technology All rights reserved Bill of Materials BOM Left click on View menu Left click on Bill of Materials HX Say them 28 14 mcm vw LTs AD ITI 1411 1 25 mm ar Technology Inc All rights reserved Smuate Tools Window mmm a z l Bill of Materials 4 Zoom ie Ref PartNo Description ja gt M 2 C3225X5R0J226M capacitor 22uF 63V Le uM C2 TOK C3225X5R0J226M capacitor 22uF 6 3V am Pw m sm capacitor 22pF 1 Cr HE D EE E itor 220pF F Show Grd eme Le po Coilera 11001608 222 inductor 2 2
19. nter root part to search for the model e g 3411 Left click on OK Linear Technology LTspice 5Switc x Select Component Symbol re E p inj E3 X File Edit Hierarchy View Simulate Tools Window Top Directory CAPROGRA 153LTCNSwCADIIINMibSsym v 1 254 4MHz Synchronous Step down DC DC Converter E Pl Fm ES Open this macromodel s test fixture LTC3411 CAPROGRA 1 SLTCSSwCADIIINibSsymNPowerProducts LTC3404 LTC3406B 1 2 LTC3410 1 65 LTC3405 LTC3406B 1 5 LTC3410 1 875 LTC34054 LTC3406B 1 8 LTC3410B LTC34054 1 375 LTC3406B 2 LTC3410B 1 2 LTC34054 1 5 LTC3407 LTC3410B 1 875 LTC34054 1 8 LTC3407 2 LTC3411 LTC3406 LTC3407 4 LTC3412 LTC3406 1 2 LTC3408 LTC34124 LTC3406 1 5 LTC3409 LTC3413 LTC3406 1 8 LTC3410 LTC3414 LTC3406B LTC3410 1 2 LTC3415 lt Cancel 2011 Linear Technology Getting the Latest Datasheet Use the macromodel s shortcuts to download the Datasheet as a reference for your design Hold Ctrl key and right click Ctrl right click over the LT macromodel s symbol e Left click on Go to Linear website for datasheet on the dialog box that appears You can also open the macromodel s test fixture as a draft starting point 2011 Linear Technology Ispice SwitcherCAD Ill 1 25A 4MHz Synchronous Step down DC DC Converter Open this macromodel s test feature X Go to Lin
20. uH 2 34 pk FF Mark Unconn Fins muse C Ts e resistor 20K Mark Text Anchors resistor 80 6K resistor 324K Bd of Materiais uuu resistor 10K o ML Em resistor 20K i Efficency Report E LTC3411 integrated circuit _ By SPICE 90 SPICE Error Log X ES Traces Autorange Y ax un x Marching Waves L T Set Probe Reference Status Bar ase e era reliable operation i Ioobar byout may significantly affect k d Window Tabs circuit is distributed upon ne served of this creuit at the bottom of the schematic 2011 Linear Technology Computing Efficiency of SMPS Circuits Left click on Simulate menu Left click on Edit Simulation Cmd Left click on Stop simulating if steady state is detected Automatically detect the steady state by checking the internal state of the macromodels Herun simulation F Linear Technology LI spice SwitcherCAD I Milta T Ele Edit es Tiaan AC Analysis DC seep Mowe DC Tiande OC pat F reiform a Peer lents Faroe deviens CE TRE Saol dm Tras bo Start Savno Dara Mu EE emicona caf Tee step ee e P Gist external DC supply voltages ar OY 7 P Rn LI S Stop writing d steady state a detected 7 Dent reset T e
21. y behavioral source Voltage dependent voltage Current dependent current Voltage dependent current Current dependent voltage Independent current source JFET transistor Mutual inductance MOSFET transistor 2011 Linear Technology Lossy transmission line Bipolar transistor Voltage controlled switch Lossless transmission line Uniform RC line Independent voltage source Current controlled switch Subcircuit MESFET transistor many more Drawing Lines and Labeling Nodes Technology SwitcherCAD III 59 12V 250mA 1372 asc Mew window Edt Heb Bie 217 Bilis ee 2113 elc sw AS OUT 4 7yP Draw Wire Place Ground Label Node Lines Left click on the Draw Wire in the Schematic Editor Toolbar e Left click a blue box terminal Define the line s path with a left click over intermediate points Left click on another blue box terminal 2011 Linear Technology LINEAR Editing Circuit Elements upiicate F jLinear Technology 5witcherCAD III 5 12V 250m4A 1372 asc Ea o RAR Eli Left click on the desired editing option Left click on the circuit element 2011 Linear Technology Editing Circuit Elements Attributes Right click on the component symbol to modify attributes Resistor R Manufacturer P
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