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Old 8th March 2013, 09:11 AM   #1
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Default 6N137 LTspice model

Does anyone have a LTspice model for the 6N137 optocoupler ?

I've tried google but i only find ones for orcad.
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Old 8th March 2013, 06:51 PM   #2
Khron is offline Khron  Romania
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Have you tried the LTspice Yahoo group? I seem to remember seeing either the 6n137 or the 6n139 in the model folder there, not long ago :
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Old 8th March 2013, 07:32 PM   #3
jcx is online now jcx  United States
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most spice subcircuits should run in Ltspice - may have to make a package which Ltspice can do automatically
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Old 8th March 2013, 08:12 PM   #4
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I did find a ftp yahoo group thing with quite a few models, but i get the absolute best performance with a simple transistor level shifter, second best with a HCPL3140 model and the worst out of the bunch with the 6N137 model.
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Old 8th March 2013, 08:53 PM   #5
jcx is online now jcx  United States
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maybe you should sim the test circuits, see which models look most like datasheet numbers, graphs - or even hardware measurements

models can be suitable in one context but worthless in another that relies on different part characteristics

and learning to design for worst case is good for you anyway...
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Old 9th March 2013, 02:49 AM   #6
Khron is offline Khron  Romania
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Yep, there it is:

http://tech.dir.groups.yahoo.com/gro.../%20Lib/6N137/
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Old 9th March 2013, 08:25 AM   #7
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It might be that the models are made in such a way that they expect and require a redundand ground to work properly and thus doesent work properly when beeing level shifted.

The IXDD414 model on that is is just like that, it works pefectly fine when ground referenced, but when referenced to VS(output) on a mosfet halfbridge, it doesent work at all.
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Old 9th March 2013, 08:37 AM   #8
jcx is online now jcx  United States
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no Spice will allow total DC isolation - all circuits must have DC path to Spice gnd (node=0) - it simply can't find DC operating point, formulate the impedance matrix, invert it if any part is totally isolated

there is a Gmin spec - some Spice option can be set to give some large value like 100 GigaOhm to gnd from all circuit nodes

Last edited by jcx; 9th March 2013 at 08:41 AM.
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Old 9th March 2013, 11:14 AM   #9
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The issues i had with the 6N137 model vanished with some overlap adjustment as per Crown K1 service manual, ie offsetting the triangular wave about 200 millivolts.
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