I'm new to LTSpice but have the basics figured out (laying out a schematic, setting up simulation, running) and have done so with the basic but very well stocked library included. Of course my issue is I'm not using LT op amps.
I'm trying to import the model for the LM4562, but there are three options: PSPICE, and two TINA-TI which I'm not even sure what that is. The PSPICE package does not contain any .mod or .subckt files, rather it contains a .lib that has all the subcircuit information in it.
I have been trying for the last few hours to import the parameters and get it to work to no avail. All the tutorials are usually directed either at .mod files, or when I try to .INCLUDE the .LIB file, it throws errors that I don't fully understand.
I used the opamp2 symbol and modified it so that the pin names match up, or at least I believe I did (I could have done it incorrectly I suppose).
Below is a screenshot of the circuit I'm using to test it, and the error message I get:
Below is my Netlist:
D:\Projects\Electronics!TestCCt\opamp test.asc
V1 VCC 0 9
V2 0 VEE 9
V3 Vni 0 SINE(0 1 500)
R1 0 Vi 1K
R2 OP Vi 9.09K
XU1 Vi Vni VCC VEE OP LM4562
.INCLUDE D:\Library\Datasheets\Models\lm4562\LM4562.LIB
;op
.tran 0 25ms 0s 1ms
.backanno
.end
Errors are as follows. I'm not sure what nodes are floating:
**Circuit: * D:\Projects\Electronics!TestCCt\opamp test.asc
WARNING: Node U1:1:U11:VP1 is floating.
WARNING: Node U1:1:14 is floating.
WARNING: Node U1:1:U11:VP2 is floating.
WARNING: Node U1:1:U11:VP3 is floating.
WARNING: Node U1:1:U11:VP4 is floating.
WARNING: Node U1:1:U11:VZ1 is floating.
WARNING: Node U1:1:U11:VZ2 is floating.
WARNING: Node U1:1:U11:VZ3 is floating.
WARNING: Node U1:1:U11:VZ4 is floating.
WARNING: Node U1:1:9 is floating.
Direct Newton iteration failed to find .op point. (Use ".option noopiter" to skip.)
Starting Gmin stepping
Gmin = 10
Gmin = 1.07374
vernier = 0.5
vernier = 0.25
vernier = 0.125
Gmin = 1.02385
vernier = 0.0625
vernier = 0.03125
vernier = 0.015625
Gmin = 1.01955
vernier = 0.0078125
vernier = 0.00390625
Gmin = 1.0126
vernier = 0.00520833
vernier = 0.00260417
vernier = 0.00130208
Gmin = 1.00833
vernier = 0.000651042
vernier = 0.000868055
Gmin = 1.00696
vernier = 0.00115741
vernier = 0.000578703
Gmin = 1.00536
vernier = 0.000771604
vernier = 0.000578703
vernier = 0.000771604
vernier = 0.000578703
Gmin = 1.00449
vernier = 0.000434027
vernier = 0.000578703
Gmin = 1.00351
vernier = 0.000434027
Gmin = 0
Gmin stepping failed
Starting source stepping with srcstepmethod=0
Singular matrix: Check node u1:1:u11:vz3
Iteration No. 1
Singular matrix: Check node u1:1:9
Iteration No. 2
Could not converge to DC with sources off!
Starting source stepping with srcstepmethod=1
Singular matrix: Check nodes u1:1:14 and u1:1:9
Iteration No. 1
Could not converge to DC with sources off!
Singular matrix: Check node u1:1:9
Iteration No. 1
Fatal Error: Singular matrix: check node u1:1:9
Iteration No. 1
This circuit has floating nodes.**
What am I doing wrong, and more importantly, how do I import this model correctly?
Best Answer
It looks like the op amp symbol you dropped in your schematic is not mapping to the correct pins on the device. What symbol did you use? You can make a new symbol and make sure the pin names match those in the .lib file...