I tried that model too to no success. 
Thanx for the effort though. I imagine it worked for some specific resistor settings or network topology.
I wrote an e-mail to National Semiconductor asking for this or a model of some other similar LM chips. I imagine I may not hear back until after New Years however; or not at all.
Thanx for the effort though. I imagine it worked for some specific resistor settings or network topology.I wrote an e-mail to National Semiconductor asking for this or a model of some other similar LM chips. I imagine I may not hear back until after New Years however; or not at all.
Here's the Gerry's model... Had to do something to it to get it to "work" - don't remeber what though. I guess there was some inconsistancy in the pin order of LTspice's opamp symbol file or something.
This model works partially but is not very good. Both inverting and non-inverting circuits give results that are OK but the model has some issues with the rail current draw. For example, this model never clips to rails and the rail current is always only slightly higher than the current in the feedback loop - that is few milliamperes.
* LM3886 OPAMP MACRO MODEL (INTERMEDIATE LEVEL)
*
* IN+ IN- OUT VCC VEE
.SUBCKT LM3886 1 2 81 101 102
Q1 5 1 7 NPNT
Q2 6 2 8 NPNT
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 NPNT NPN(BF=50000)
*
.ENDS LM3886
*
*
This model works partially but is not very good. Both inverting and non-inverting circuits give results that are OK but the model has some issues with the rail current draw. For example, this model never clips to rails and the rail current is always only slightly higher than the current in the feedback loop - that is few milliamperes.
* LM3886 OPAMP MACRO MODEL (INTERMEDIATE LEVEL)
*
* IN+ IN- OUT VCC VEE
.SUBCKT LM3886 1 2 81 101 102
Q1 5 1 7 NPNT
Q2 6 2 8 NPNT
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 NPNT NPN(BF=50000)
*
.ENDS LM3886
*
*
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