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Chip Amps Amplifiers based on integrated circuits

LM3875 spice - first try
LM3875 spice - first try
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Old 7th October 2006, 04:56 PM   #1
ash_dac is offline ash_dac  United Kingdom
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Join Date: Jan 2005
Location: UK
Exclamation LM3875 spice - first try


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, 94 views)
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Old 7th October 2006, 07:36 PM   #2
lineup is offline lineup  Sweden
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Join Date: Dec 2005
Location: the north

I was almost SURE National should have spice model
for LM3875 for download.
But looks like NOT.

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:

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