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LTspice IV

LTspice IV
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LTspice is also a great schematic capture ♦ Over 1100 macromodels of Linear Technology products ♦ 500+ SMPS Benefits of Using LTspice IV ♦ Stable SPICE circuit simulation with ♦ Unlimited number of nodes ♦ Schematic/symbol editor ♦ Waveform viewer ♦ Library of passive devices ♦ Fast simulation of switching mode power supplies (SMPS) ♦ Steady state detection ♦ Turn on transient ♦ Step response ♦ Efficiency / power computations ♦ Advanced analysis and simulation options ♦ Not covered in this presentation

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How Do You Get LTspice IV ♦ Go to http://www.linear.com/LTspice ♦ Left click on Download LTspice IV ♦ Register for a new MyLinear account to receive updates if you have not done so already

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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 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 powerdevices

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Demo Circuits on linear.com ♦ ♦ ♦ ♦ Go to http://www.linear.com Enter root part number in the search box (e.g. 3411) Select Simulate Tab on the left side Follow the instructions provided ORDER INFO Simulate If you do not find a demo circuit of interest, use a pre-drafted test fixture - covered next Download LTspice Download Demo Circuit LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design...

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Demo Circuit Designed and Reviewed by Factory Apps Group To run a demo circuit jump to the Run and Probe a Circuit in LTspice section What if I cannot find a demo circuit? 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 or reliability © 2011 Linear Technology

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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 remains the customer’s responsibility to verify proper and reliable operation in the actual application ♦ Printed circuit board layout may significantly affect circuit performance or reliability

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Start with a New Schematic New Schematic Left click on the New Schematic symbol in the Schematic Editor Toolbar

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-1^ Fie View Wfndcw Emulate Help Add a Macromodel & Opening Test Fixture gjLinear Technology SwiteherCftP ill [SV 12V 35QmA 1313-asc] ♦ Left click on the Component symbol in the Schematic Editor Toolbar ♦ Enter “root” part to search for the model (e.g. 3411) ♦ Left click on Open this macromodel’s test fixture To run a test fixture, jump to the Ru Probe a Circuit in LTspice section

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Start with a New Schematic New Schematic Left click on the New Schematic symbol in the Schematic Editor Toolbar LTspice is also a great schematic capture

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Add a Linear Technology Macromodel gjLinear Technology SwiteherCftP ill [SV 12V 35QmA 1313-asc] -1^ Fie View Wfndcw gmulete Help ♦ Left click on the Component symbol in the Schematic Editor Toolbar ♦ Enter “root” part to search for the model (e.g. 3411) ♦ Left click on OK

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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 ♦ 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

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Adding Circuit Elements gj Linear Technology SwitcherCAP ID -[5V 12V 250mA 13T? a«] X. Ffe View Wrvkw SjnUete £d* Help ♦ 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 - R and Ctrl - M key shortcuts ♦ Move the mouse to the position you want to place it ♦ Left click to place it To cancel or quit a component type, click the right mouse button

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Adding Sources, Loads & Additional Circuit Elements gj Linear Technology EwitcherCAD II] - [5V 12V 250mA 1377 act] Rfe View Wfnjgw SjmOate &*, Help 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 Additional Circuit Elements Like Sources and Loads Select Component Symbol!

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Highlights of Additional Circuit Elements ♦ Left click on the Component symbol in directory of additional circuit elements: ♦ Arbitrary behavioral source ♦ Voltage dependent voltage ♦ Current dependent current ♦ Voltage dependent current ♦ Current dependent voltage ♦ Independent current source ♦ JFET transistor ♦ Mutual inductance ♦ MOSFET transistor the Schematic Editor Toolbar for a 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

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