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Old 7th October 2006, 03:56 PM   #1
ash_dac is offline ash_dac  United Kingdom
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Exclamation LM3875 spice - first try

Hi,

It's pretty ropey model based on the LM386; transistors may be connected incorrectly, transistors are missing, uses LM386 model for pnp and npn transistors., bias currents are inorrect..

It seems to oscillate very easily!

LT Spice:-

.asy file in C:\Program Files\LTC\SwCADIII\lib\sym\Opamps folder
.sub file in C:\Program Files\LTC\SwCADIII\lib\sub
.asc file in C:\Program Files\LTC\SwCADIII

Did anyone get any further making a LM3875 model ?
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File Type: zip lm3875.zip (1.8 KB, 88 views)
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Old 7th October 2006, 06:36 PM   #2
lineup is offline lineup  Sweden
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hello

I was almost SURE National should have spice model
for LM3875 for download.
But looks like NOT.
http://www2.national.com/appinfo/amp...ce_models.html

Anyway
there has got be several persons that has done such a model
or for some similar IC by themselves.
I read somewhere a person used model of OPA541, Burr-Brown for LM3875 simulations.

Here is someone that did a spice model of LM3886, in January 2004
LM3886 Spice Model done
And he tried to use this information,when doing his model:
http://www.ecircuitcenter.com/OpMode...2/opmodel2.htm


Regards
lineup
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