Add spice directive ltspice

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Registration is free. Click here to register now. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Spice Models. Thread starter ACharnley Start date Oct 24, Status Not open for further replies. ACharnley Member.

I checked and it looks to have the same format as other files in there. Help most appreciated!

add spice directive ltspice

In addition there's a standard. Ah, I assume "nmos" isn't correct as it's a subcircuit, but how in earth do you find where the subcircuit is when you go "add component"?

ACharnley said:. Nothing no Diodes Inc devices.Predicting the efficiency of an application is vital to evaluating design trade-offs of a switching mode power supply. Two useful tools, the. To evaluate efficiency, clearly label your input and output voltage net as IN and OUTrespectively. Press F4 to place net names. Press F2 and type load2 in the search box to select and place the component.

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Note the names of the input voltage source V1 and the load current source I1. The variable can be temperature, a model parameter, a global parameter or in our case an independent source. These steps can be defined as linear, logarithmic or as a list of specific values. Insert a. Here, we step the independent current source, I1from 0. The param directive is used here in the. Please see the help file F1 for more details on. It is important to calculate efficiency when the circuit is operating in a steady state.

To ensure this, simulate your circuit, and note when steady state is achieved for all conditions in the. In the. Please note the current direction convention for the input voltage source, V1is into the device, hence the negative sign in the Pin calculation. The final expression calculates the efficiency using the param directive for clarity. Run your simulation.

add spice directive ltspice

The Spice Error Log contains data points for the. One neat feature of LTspice is the ability to plot the stepped. This will display the efficiency calculation over stepped load current. Of course, calculating efficiency is only one example.

He holds a Master of Science degree in electrical and computer engineering from University of California, Santa Barbara. LTspice: Using.

Letting Go (Dutty Love)

MEAS and. STEP Commands to Calculate Efficiency by Gabino Alonso Predicting the efficiency of an application is vital to evaluating design trade-offs of a switching mode power supply.The UUX-FOB diode is a combination of two different semiconductor diodes that offer alternative replacement model for traditional diodes.

Author is an expert of hv diode, visit here for more interesting information. Silahkan isi komentar yang dapat membangun blog ini.

Atas komentarnya saya ucapkan terimakasih. LTspice sangat powerfull untuk memeriksa disain dan untuk memprediksi karakteristik dari rangkaian elektronik seperti IC, Op-amp, transistor, resistor, kapasitor dan lainnya. LTspice dibuat oleh Linear technology, untuk download LTspice silahkan pergi ke alamat berikut ini:.

The opening screen will look like this:. Begin a new circuit from the file menu, or click on the "New Schematic" icon. Now you will see this:. You cannot do any simulation on the circuit if you don't have a ground. If you aren't sure where to put it, place it near the bottom of the drawing. Getting the other Parts: The next thing that you have to do is get some or all of the parts you need. This can be done by clicking on the icon for a specific component; This is good for common components such as resistors, capacitors, etc.

This can be done by typing in the name or scrolling down the list until you find it.

LTspice: Using .MEAS and .STEP Commands to Calculate Efficiency

Upon selecting your parts, click where you want them placed somewhere on the grey page with the dots. Don't worry about putting it in exactly the right place, it can always be moved later. Each type of part can be placed multiple times in succession, and they will be automatically numbered. Placing the Parts: You should have most of the parts that you need at this point.

Adding LTSPICE directives

Now, all you do is put them in the places that make the most sense usually a rectangle works well for simple circuits. When you have a part selected for a move, you can rotate or reflect it as well. If you have any parts left over, just select them and press "Delete". Connecting the Circuit: Now that your parts are arranged well, you'll have to attach them with wires.

With the pencil looking pointer, click on one end of a part, when you move your mouse around, you should see crossed lines appear. Attach the other end of your wire to the next part in the circuit.

LTspice Using Transformers

Repeat this until your circuit is completely wired.It is unique among the basic circuit elements in LTspice in that a schematic symbol is not used to represented it. Rather, it is placed as a line of text SPICE Directive onto the schematic and passes directly to the netlist to be processed by the solver. Note that text placed onto a schematic correctly as a SPICE directive will appear black in color a comment will normally appear as blue text.

Schematic text can be switched between the two types by ctrl-right-mouse-clicking on it and selecting the desired type via a "radio" button.

LTspice recommends starting with a mutual coupling coefficient equal to 1 in order to eliminate leakage inductance that can ring at extremely high frequencies if damping is not supplied and slow the simulation.

However, be aware that a mutual inductance value of plus or minus unity may lead to simulation difficulties if Skip-the-initial-operating-point-solution UIC is specified for the.

Specifying a realistic resistance for each inductor "winding" ctrl-right-mouse-click will minimize this tendency. Note that when coupled inductors are used as transformer windings, individual winding inductances rather than turns ratios must be specified inductance ratios should be proportional to the square of the turns ratios. Jump to: navigationsearch. Two lines were used to draw the core. Personal tools Log in Request account.Here is the simple approach to simulate a transformer in LTspice IV :.

The last entry in the K statement is the coupling coefficient, which can vary between 0 and 1, where 1 represents no leakage inductance. For practical circuits, it is recommended you start with a coupling coefficient of 1. Only a single K statement is needed per transformer; LTspice applies a single coupling coefficient to all inductors within a transformer.

The following is an equivalent to the statement above:. For example, for a and turns ratios, enter inductance values to produce a one to nine and one to four ratios:. For more information on how to simulate a transformer you can view the Using Transformers video.

How to add a model to LTspice (SwitcherCad)

He holds a Master of Science degree in electrical and computer engineering from University of California, Santa Barbara. Adding the K statement displays the phasing dot of the included inductors.

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LTspice simulates the transformer using individual component values, in this case, the inductance of the individual inductors, not the turns ratio of the transformer. The inductance ratio corresponds to the turns ratio as follows:.LTspice is not limited to simulating Linear Technology parts. Third party models can be imported into LTspice too. There are 2 types of model that can be imported into LTspice:. MODEL parts - these are simple components such as transistors and diodes.

If the part is defined with a.

add spice directive ltspice

MODEL statement, importing the model is handled one way; if the part is defined with a. Thus we could import 2 identical diodes, one defined with a. MODEL statement and one defined with a. LTspice looks at the model definition, NOT the component to determine how to import the part. MODEL parts:. MODEL directivefollow these steps:. Add a. Ensure the. Here is an example of how to import a Schottky diode into a circuit.

FIG 1 shows a simple circuit to measure the forward voltage drop across a diode. This can be downloaded here: Diode Test Circuit. FIG 1. Running the simulation shows the diode has a forward voltage drop of Remove diode D1 and replace it with the standard Schottky diode from the LTspice library. To avoid spelling mistakes, use Windows Explorer to highlight and copy the filename including the filename extension.

Paste the text after the include statement. Again, to avoid spelling mistakes, it is easier to highlight the model name and copy it. Do not put any comments in the Spice Model field.

LTspice Tutorial

FIG 2. The final circuit should look like FIG 3. FIG 3.Parametric analysis analyzes while changing parameters such as resistance, capacitor, inductor, and power supply of electronic circuit. Sponsored Links Contents. Perform parametric analysis using the schematic in the following article. If you have not drawn a schematic with LTspice, we recommend that you draw a schematic before analysis. In addition, since the schematic was prepared here, if you want to start analysis immediately, download it by clicking the link below.

Resistance setting It is necessary to set the part which changes the parameter in parametric analysis. This time, set the feedback resistor R2 of the op-amp.

This time I set the variable to R2, but anything with alphanumeric characters is fine. Parametric analysis is performed simultaneously with transient analysis, AC analysis, DC sweep analysis and so on. This time, we set up transient analysis to be performed simultaneously with parametric analysis.

In this article, it was placed near source V1. This is the setting for performing a parametric analysis that changes the variable R2 from to ohms in ohm linear steps. The simulation time varies depending on the size of the circuit. After simulation, the graph pane will appear at the top of the schematic with the default settings of LTspice. Analysis result In this article, we would like to easily check the analysis results with the LTspice voltage probe.

If you check the voltage waveform of OUTPUT, you can see that it increases from 2V to 8V each time the parameter of feedback resistor of op amp increases. The schematic used for the parametric analysis can be downloaded from the link below. LTspice-Analysis Types. In this article, we will briefly introduce the types of analysis that can be performed with LTspice.

Please refer to the linked article for an explanation of each detailed analysis method. Please see the following article for a detailed explanation…. LTspice-How to Draw a Schematic. After all, in order to learn how to use LTspice, it should be faster to use the practice form and to learn first than to read the instruction manual. In this article, we will learn how to draw a schematic with LTspice, using the "Inverting Amp…. LTspice requires setting of the signal source when simulating.

In this article, we will focus on how to set up a independent voltage source for analysis. For the types of analysis, please see the following article. How to open "Independent Volta…. How to set up detailed transient analysis. LTspice-Simulation Commands Setting.

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In this article, we will explain in detail how to set the simulation command used for the following six types of analysis. Transient Analysis. Dot command can be created with Edit Text on the Schematic.

add spice directive ltspice

LTspice-Initial Setting. Since LTspice allows you to make various settings in detail, there may be some confusion as to what to set.