Ltspice Error
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Ltspice Rshunt
LTSpice + Post New Thread Results 1 to 5 of ltspice singular matrix 5 Singular Matrix error on LTSpice LinkBack LinkBack URL About LinkBacks Thread Tools Show Printable Version Download ltspice igbt model This Thread Subscribe to this Thread… Search Thread Advanced Search 4th August 2015,19:29 #1 schmitt trigger Advanced Member level 5 Join Date Apr 2013 Location C4E4DEEEDCE6ECD2 Posts
Singular Matrix Check Node Proteus
1,603 Helped 500 / 500 Points 9,322 Level 23 Singular Matrix error on LTSpice There is a power supply circuit which we have built over 70,000 units in almost 9 years. And it has been working reliably for all that time, even during extreme environmental conditions. We would like to reuse this circuit for an almost identical
Ltspice Igbt Symbol
application. We actually have built several dozen prototypes and they work just fine. But we would like to understand the actual operating conditions, and make sure that we are not overloading something. The best way to do this is through simulation. Since this is an LT3433 buck-boost regulator, I used LTSpice. When I run it, however, I get a "Singular Matrix error on Node 006"....Node 006 is only the 330pF compensation cap to ground. Now, PLEASE NOTE: My question is only related to the LTSpice error message. The real circuit itself is working very well. EDIT: I had to upload the .ASC file as .TXT file, for the attachment manager to allow me to upload it. Last edited by schmitt trigger; 4th August 2015 at 19:34. My batteries are recharged by "Helpful Post" ratings. If you feel that I've helped you, please indicate it as a Helpful Post 4th August 2015,19:29 4th August 2015,20:33 #2 mtwieg Advanced Member level 5 Join Date Jan 2011 Posts 2,897 H
Q: I have just overwritten an LTspice jig. How do I get the original back? A: Save the modified file to a directory of your choice (if needed) then go into Tools-> Sync Release to restore the original file. Checking the ltspice create symbol date code of the updated file should show the current date. Q:
Singular Matrix Check Nodes Proteus
I get the message: Port(pin) count mismatch between the definition of subcircuit "xxxx" and instance "xxx". A: This is normally analysis failed matrix is singular encountered when a Spice model has been imported into LTspice and the Spice model definition has a different number of pins to the actual symbol used. If you have created your own symbol, http://www.edaboard.com/thread342095.html Go into File -> Open, Change the 'File of Types' dropdown menu to Symbols (*.asy) and open the symbol. Then select View -> Pin Table to see the pin assignments. Also check that your SPICE model specifies the expected number of pins. The SPICE model below specifies an N channel FET with 4 pins, labelled 20, 10, 30, 50, but its datasheet shows a circuit symbol http://www.simonbramble.co.uk/lt_spice/ltspice_lt_spice_faqs.htm with only 3 pins. In this case, it is better to use another FET rather than trying to edit the SPICE model *FDD6630A at Temp. Electrical Model *------------------------------------- .SUBCKT FDD6630A 20 10 30 50 *20=DRAIN 10=GATE 30=SOURCE 50=VTEMP . . . This error message can also occur if incorrect text has been entered into the Component Attribute Editor. In the Schematic View, right click on the component to bring up the dialogue box below If text has been added against the SpiceModel Attribute, it will throw up this error. This line should be left blank. For further instructions on how to import external models, see the LTspice Tutorial: Part 4 on this site. Q: I get the message: This schematic uses symbols that couldn't be found. Saving it will remove references to these symbols from the schematic. A: This normally happens after a Spice model has been imported into LTspice and the original file containing the model has been deleted. Even if the file has been undeleted, LTspice can throw up this error. If undeleting the model file does not solve the problem, redrawing the circuit in a fresh file no
gmin=1e-10 => Add a small conductance of 1e10(=10GOhm) parallel to every diode of transistors and diodes. .options abstol=1e-10 => Increase the allowed tolerance from 1e-12 to 1e-10 http://ltwiki.org/index.php5?title=Convergence_problems%3F for the convergence criteria. .options reltol=0.003 => Increase the allowed tolerance from 0.0001 to 0.003 for the convergence criteria. Never larger than 0.003! .options cshunt=1e-15 => Capacitance added from each node to ground. Adding a small CSHUNT to each node can solve some "internal timestep too small" problems caused by high-frequency oscillations or numerical noise. Default singular matrix = 0. See Understanding the Control Options for a more detailed look. Be suspicious of circuits that need something like the alternate solver or cshunt. To me, it means something in the circuit is poorly behaved; in other words, there is something in a model that is not realistic. All of these settings changes trade singular matrix check off accuracy for speed. If these changes don't significantly improve the speed of the simulation, remove them. It never makes sense to add them for any simulation that takes under a minute or two. Common questions or situations I have been trying to understand your models of PWM controllers. You seem to use a BI current source in series of a capacitor very often. Can you please let me know why a capacitor is needed, and how you determine the capacitor value? Is it to help the convergence or to implement the pole of op amp? For example, the nodes of "hys", "latch", "Ierr" in UC3842A model you created, as attached. Whenever possible, I try to arrange a model so the capacitors do double duty, that is to both aid transient convergence and to provide some direct function (e.g., an opamp pole). I am puzzled with the necessity of adding the capacitor (with various value) when converting a current to a voltage. I would