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Old 8th January 2004, 07:30 AM   #1
Gerry is offline Gerry  Germany
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Default LM3886 Spice Model done

Hi,

my first posting on this nice forum.

Since I couldn't find one I did a crude LM3886 spice model (without modelling mute).
It's done along those lines:
http://www.ecircuitcenter.com/OpMode...2/opmodel2.htm

The LM3886 specs are here:
http://www.national.com/ds/LM/LM3886.pdf

Since I am a novice with opamps I would be most grateful if someone could do a check on it.

* LM3886 OPAMP MACRO MODEL (INTERMEDIATE LEVEL)
*
* IN+ IN- OUT VCC VEE
.SUBCKT LM3886 1 2 81 101 102
Q1 5 1 7 NPN
Q2 6 2 8 NPN
RC1 101 5 377.99
RC2 101 6 377.99
RE1 7 4 357.99
RE2 8 4 357.99
I1 4 102 0.001
*
* OPEN-LOOP GAIN, FIRST POLE AND SLEW RATE
G1 100 10 6 5 0.002645552
RP1 10 100 37.8MEG
CP1 10 100 0.0000526316UF
*
*OUTPUT STAGE
EOUT 80 100 10 100 1
RO 80 81 100
*
* INTERNAL REFERENCE
RREF1 101 103 100K
RREF2 103 102 100K
EREF 100 0 103 0 1
R100 100 0 1MEG
*
.model NPN NPN(BF=50000)
*
.ENDS LM3886
*
*
Gerry
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Old 10th January 2004, 07:00 AM   #2
Pedja is offline Pedja  Serbia
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Gerry,

I will look at this more closely ASAP, but this is the AC response in the MicroCap (inverted mode, 220k/10k feedback network). Needs correction, obviously.

Thanks for sharing.

Pedja
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Old 2nd November 2004, 05:47 AM   #3
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I'm not succeed to use this model in PSpice (Schematics), is there
any conversion I need to do before I can use it?

I opened it up in PSpice A/D but didnt succeed to get an output file from it.
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Old 2nd November 2004, 12:20 PM   #4
Gerry is offline Gerry  Germany
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Lazyworm,

No idea, I used LTspice.

In any case I would be grateful for a reality check of this model.

If I recall correctly I had some problems in non-inverted mode - cant recall exactly what they were.

Cheers.

Gerry
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Old 2nd August 2010, 05:41 PM   #5
lineup is online now lineup  Sweden
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Quote:
Originally Posted by Gerry View Post
Hi,

my first posting on this nice forum.

Since I couldn't find one I did a crude LM3886 spice model (without modelling mute).
It's done along those lines:
Opamp Model -* Level 2

The LM3886 specs are here:
http://www.national.com/ds/LM/LM3886.pdf

Since I am a novice with opamps I would be most grateful if someone could do a check on it.

* LM3886 OPAMP MACRO MODEL (INTERMEDIATE LEVEL)
*
* IN+ IN- OUT VCC VEE
.SUBCKT LM3886 1 2 81 101 102
Q1 5 1 7 NPN
Q2 6 2 8 NPN
RC1 101 5 377.99
RC2 101 6 377.99
RE1 7 4 357.99
RE2 8 4 357.99
I1 4 102 0.001
*
* OPEN-LOOP GAIN, FIRST POLE AND SLEW RATE
G1 100 10 6 5 0.002645552
RP1 10 100 37.8MEG
CP1 10 100 0.0000526316UF
*
*OUTPUT STAGE
EOUT 80 100 10 100 1
RO 80 81 100
*
* INTERNAL REFERENCE
RREF1 101 103 100K
RREF2 103 102 100K
EREF 100 0 103 0 1
R100 100 0 1MEG
*
.model NPN NPN(BF=50000)
*
.ENDS LM3886
*
*
Gerry
I added this model to my MultiSim.
It worked right away!
Thanks Gerry
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Old 24th February 2012, 08:19 AM   #6
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This LM3886 works fine with Multisim?
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