Ltspice Fatal Error Singular Matrix
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Ltspice Rshunt
Thread Tools Show Printable Version Download This Thread Subscribe to this Thread… Search Thread singular matrix check node proteus Advanced Search 4th August 2015,19:29 #1 schmitt trigger Advanced Member level 5 Join Date Apr 2013 Location C4E4DEEEDCE6ECD2 Posts 1,603 Helped 500 / 500
Singular Matrix Check Nodes Proteus
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 ltspice node is floating environmental conditions. We would like to reuse this circuit for an almost identical 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 ltspice find node 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 Helped 1004 / 1004 Points 17,103 Level 31 Re: Singular Matrix error on LTSpice When I run it I get the old "damped pseudo transient" message, which usually means it's unable to converge to an initial DC condition. I solved it by forcing an initial condition on that node voltage. So label that net "vc" and then add the statement ".ic V(vc)=0" and it works. 1 members found this post helpful. 4th August 2015,20:33 5th August 2015,04:24 #3 BradtheRad Super Moderator Join Date Apr 2011 Location Minneapolis, Minnesota, USA Posts 10,317 Helped 2069 / 2069 Points 42,077 Level 50 Re: Singular Matrix error on LTSpice Besides setting an initial charge on the capacitor (per post #2)... In some cases it helps to install a resistor (low ohm) inline with
Posts Today's Posts 1Next > Nov 20, 2010 #1 tom66 Thread Starter Senior Member May 9, 2009 2,613 213 I am designing a buck regulator LED power supply in LTspice. I'm trying to add an optocoupler on/off switch to it (which will
Gmin Stepping Failed
be an option.) When the opto is ON, the output should be OFF (which is controlled dynamic gmin stepping failed by turning off the standby supply reducing consumption to a few microamps), and vice-versa. However, LTspice is giving me odd errors: WARNING: Node N012 is floating. WARNING: Less than two connections to node NC_01. This node is used by S:U4:1. Singular matrix: Check node q5#collector Iteration No. 2 Fatal Error: Singular matrix: check node q5#collector Iteration No. 2Click to expand... Does anyone know http://www.edaboard.com/thread342095.html what's wrong? Attached Files: Screenshot-1.png File size: 5.4 KB Views: 349 #1 Like Reply Nov 20, 2010 #2 mik3 Senior Member Feb 4, 2008 4,846 63 Put a ground on V1. #2 Like Reply pfg23 likes this. Nov 20, 2010 #3 retched AAC Fanatic! Dec 5, 2009 5,201 312 That should do it. Post your asc file, as well as any non-standard models. It will make following along that much easier. #3 Like Reply Nov 20, http://forum.allaboutcircuits.com/threads/ltspice-singular-matrix.45862/ 2010 #4 tom66 Thread Starter Senior Member May 9, 2009 2,613 213 mik3 said: ↑ Put a ground on V1.Click to expand... Okay, but doesn't that make it non-isolated? (I presume this is only a simulation bug/limitation?) retched said: ↑ That should do it. Post your asc file, as well as any non-standard models. It will make following along that much easier.Click to expand... See attached. Attached Files: buck-reg-led.asc File size: 5.1 KB Views: 184 #4 Like Reply Nov 20, 2010 #5 retched AAC Fanatic! Dec 5, 2009 5,201 312 Spice requires a ground reference. It checks to see if there is a ground in the schematic, but doesn't check to see if it is in the proper places. #5 Like Reply Nov 20, 2010 #6 mik3 Senior Member Feb 4, 2008 4,846 63 I am not sure if you can tell spice to use to different grounds. In reality it will work with two isolated grounds but here it needs to have ground every where to work. #6 Like Reply Nov 20, 2010 #7 SgtWookie Expert Jul 17, 2007 22,182 1,728 Tom66, I can't load that .asc file; my LTSpice doesn't like it one bit. Did you upload a shortcut to the .ASC file instead of the actual .asc file? #7 Like Reply Nov 20, 2010 #8 retched AAC Fanatic! Dec 5, 2009 5,201 312 I couldn't get it to
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page 1, 2Next Robert BaerGuest Thu Sep 28, 2006 2:56 am I do not understand the error message and have no clue to fix it. The inverter may be the problem; would like it to "emulate" a TPS2818 but do not know how. Jenalee K.Guest Thu Sep 28, 2006 8:09 am Robert Baer a écrit : Quote:I do not understand the error message and have no clue to fix it. The inverter may be the problem; would like it to "emulate" a TPS2818 but do not know how. Actually playing with LTspice (V2.17i, May 2006) but not a specialist at all, I loaded your design and let it run. What error message? I don't get any. However, I don't think your circuit is doing what you want it to do... or maybe the simulation is too short. Thanks, Jenalee K. Johnny BoyGuest Thu Sep 28, 2006 9:46 am "Jenalee K."