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fatal error analysis timestep too small Kamas, Utah

Different products have different specs - if you're an engineer, keep discussions purely based on merit. The really weird thing is that if I run the simulation with V1 set to 12V, the simulation runs fine Flyback, Feb 2, 2014 #10 alec_t Well-Known Member Most Helpful We're a knowledgeable forum and here to help. Attached Files: TLV431A_TI_test.zip File size: 2.1 KB Views: 143 Flyback, Feb 1, 2014 #5 ericgibbs Well-Known Member Most Helpful Member Joined: Jan 4, 2007 Messages: 20,587 Likes: 609 Location: Ex Yorks'

Thank you. 13th June 2003,12:43 13th November 2003,10:04 #6 lll Junior Member level 1 Join Date Nov 2003 Posts 18 Helped 0 / 0 Points 1,756 Level 9 time The only way I could get it to complete running was to leave X1 and Y1 open. Your particular circuit may not require resolutions down to 1uV or 1pA. Wayno posted Oct 14, 2016 at 11:19 PM Score Counter PCB Help DarkDeltaWolf posted Oct 14, 2016 at 11:06 PM Loading...

Could your TLV model be the problem.? Set ITL4=500 in the .OPTIONS statement. If the problem is truly an engineering problem, we'll allow it, but fixing your laptop or a cracked LCD screen doesn't qualify. Keep brand wars to a minimum.

I was able to run the sim longer if I used this option: .options cshunt=1e-15 not good.. One, every active device must have realistic capacitances between all nodes. The asc file uses my TL431 model, it runs in LTS. Don't bother trying to test the slew rate for this, as it's a macromodel, not a component model.

The only voltage sources should be zero volt sources used for current sensing. Use the Alternate solver Control Panel -> SPICE -> Solver:Alternate 2. That works great! (Actually, with Td=10n on one gate, it took a long time to simulate; with Td=10n on one and Td=15n on the other, it was instantaneous.) Thanks for the The time now is 16:08.

If discontinuities exist in a device model (perhaps between the linear and saturation regions of the model), increasing the step size may allow the simulation to step over the discontinuity. If it fails to find these voltages and current (fails to converge) then it will not be able to perform an analysis of the circuit. But I also tried grounding the unused inputs, and that didn't seem to make much difference. Attached Files: ad633.zip File size: 1.9 KB Views: 71 Multiplier.asc File size: 1.9 KB Views: 58 #1 Like Reply Oct 24, 2011 #2 chrisw1990 Active Member Oct 22, 2011 543 41

Specify the initial condition of semiconductor devices, especially diodes, as OFF. permalinkembedsavegive gold[–]jeffbell 2 points3 points4 points 1 year ago(2 children)Nice writup! Generated Sat, 15 Oct 2016 14:55:45 GMT by s_wx1094 (squid/3.5.20) Change the Integration Method to one of the Gear methods.

Then your circuit has a solution. > > That works great! (Actually, with Td=10n on one gate, it took a long time > to simulate; with Td=10n on one and Td=15n The trick was to replace the NAND gates with inverting Schmitt triggers: (permalink). I have uploaded a file where i'm > trying to use the ad633 for division (per the AD datasheet) > to the "temp" folder called "ad633extract.asc". Follow the information contained in this section of the reference and work through the suggested points, trying one at a time.

Enter your project now and get in on fame and fortune. David, Jan 12, 2006, in forum: Electronic Repair Replies: 0 Views: 898 David Jan 12, 2006 Sprague TEL-OHMIKE Model TO-4 Capacitor-Resistor Analyze , May 14, 2007, in forum: Electronic Repair Replies: OkGuy 2nd April 2004,19:25 #13 maxwellequ Full Member level 3 Join Date Jun 2001 Posts 185 Helped 24 / 24 Points 3,518 Level 13 timestamp too small The timestep used by DC Sweep Analysis troubleshooting When you have a problem with a DC Sweep analysis, first try the steps listed abovein the Convergence troubleshooting steps.

Thanks!Click to expand... Solution: The Time Step Too Small Error in Multisim is a very generic error that can represent a number of different simulation issues.In smaller circuits this error is generally due to Like most Simulators, the Altium Designer-based Simulator's SPICE engine uses an iterative process of repeatedly solving the equations that represent your circuit, to find the quiescent circuit voltages and currents. All rights reserved Privacy Policy · Terms of Service · User Agreement Log in or Sign up Electronics Forum (Circuits, Projects and Microcontrollers) Home Forums Electronics Forums Circuit Simulation & PCB

This will allow the Transient analysis to go through more iterations for each timestep before giving up. Replace device models with subcircuits, especially for RF and power devices. Example (for transient analysis): .tran 0.01ns 360ns The "0.01ns" is your timestep to run the transient analysis till 360ns. Reduce the rise/fall times of the PULSE sources.

E Eric " Good enough is Perfect ", good enough means it meets the Clients specification.! There is a problem with your model Attached Files: AAesp03.gif File size: 7 KB Views: 497 Eric " Good enough is Perfect ", good enough means it meets the Clients When the direct Newton method fails the simulation goes through the process of GMIN stepping and then if that fails, it tries source stepping. Example: .TRAN .1N 100N UIC 8.

This is either because of other stiff voltage type sources elsewhere within the circuit or because the solver failed when it was trying to find the dc operating point (during which Reduce the accuracy by increasing the values of ABSTOL and VNTOL, if current/voltage levels allow. Modeling dudes don't have data for that and don't check it. Dangling nodes and stray parts are not allowed.

Whenever the simulator reduces the time step, it is because of nonlinear circuit behavior. LTSpice user group, and found this exchange: > Hi, > > I can't get LTSpice to simulate AD633 correctly. > My output Vout is railed when I used as in the Tech support help can be found in /r/gadgets. I followed the advice in this thread: http://forum.allaboutcircuits.com/showthread.php?t=60825 and I was able to get it to work, now I just need to adjust my variable input voltage and current readings (slower

I didn't see your reply before I posted mine. However, the simulation is very sensitive to the input values I enter. Thanks! In order to get good transient convergence, a good model should, as much as possible, contain elements with only voltage inputs and only current outputs (Norton equivalents should be used to

To participate you need to register. This could happen if the associated integrated library in which the model is stored is not installed, or it has been moved from its original install location. Member Login Remember Me Forgot your password? Privacy Policy Terms and Rules Help Popular Sections Electronics Projects Datasheets Resources Connect With Us Log-in Register Contact Us Forum software by XenForo™ ©2010-2015 XenForo Ltd.