Hello, Do you know how I can get this simulation working?, it gives the above error.
Posted by4 years ago
Archived
Hello! I'm new to LTspice and am trying to get this simulation working. I really don't know what to try but I've fooled around some, always with the same resulting error:
I don't really know what to do about it, I don't even know what numbers to put in to the simulation cmd. I build it a couple of months ago on a different computer which I cant access anymore. On that comp the simulation worked without a problem. The only setting I had changed was to set the Solver to Alternate, but that doesn't seam to help now.
I don't know if this is the right place to ask but I'd be happy if i got some help.
![Ltspice fehler time step too small Ltspice fehler time step too small](/uploads/1/2/5/2/125281696/290932862.jpg)
Thanks!
Ps. here's a screenshot if that helps somehow
9 comments
Active2 years, 7 months ago
$begingroup$I am trying to simulate a LDO with Microchip MCP6001 operational amplifier in LtSpice. With other OA simulation is ok, but with all Microchip models, the same error:
Here is the model with trouble
And here my schematic
I guess there is something wrong with the model, but I am not expert in spice to solve it. Thank you in advance,
![Ltspice Ltspice](/uploads/1/2/5/2/125281696/482411314.png)
orfruitorfruit
$endgroup$2 Answers
$begingroup$Your not guaranteed that a model from any manufacturer is going to work (and most of models only simulate some of the aspects of a device. (for example: an op amp model may only simulate noise, common mode and input bias current and output current)
I would try validating only the model and run some tests (like .ac tests for bandwidth, a sin sweep in inverting gain, non inverting gain and unity gain) just to see how the model behaves. Then if you throw the model into a different circuit you know it will work.
Secondly there are different solvers that can be changed in the control panelTry a different solver and see if it gives you better results, some solvers work better than others for a given circuit.
Don't change the tolerances unless read up on it first.
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$endgroup$$begingroup$Hmm.. I found it :) In case anyone struggle like me. Not sure how would impact my simulation, but adding extra option to LtSpice at least started simulation:
However, simulation is horrible slow :(
orfruitorfruit
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