Need a spice model for lm337

[moxygen]

dear staff,
I have a few problems. First I have looked everywhere for the spice model of the lm337.
It's an adjustable three terminal regulator that provides a negative voltage power source. I am troubleshooting a power supply that has no schematic what so ever (my employer bought 30 power supplies oversees from an unknown company). According to my schematic there are two full wave rectifiers each providing an unregulated voltage source to two regulators each. one is an lm317,the second one a 7905,the third is a7805, and the final one is an lm337. Without the spice model it will be vary hard to emulate the power supply and troubleshoot any possible errors the manufacturerers might have made. I've called various companies and my problem has yet to be solved.

Thank you

[lacy]

Here's my model from Multisim 2001. I don't know if it actually works as an adjustable regulator or not since I haven't used it before in the Simulator. I hope it work for you.

.SUBCKT LM337H 3 1 2
*      Model Generated by MODPEX     *
*Copyright(c) Symmetry Design Systems*
*         All Rights Reserved        *
*    UNPUBLISHED LICENSED SOFTWARE   *
*   Contains Proprietary Information *
*      Which is The Property of      *
*     SYMMETRY OR ITS LICENSORS      *
*Commercial Use or Resale Restricted *
*   by Symmetry License Agreement    *
* Model generated on Sep  8, 97
* MODEL FORMAT: SPICE3
*Rev. Date: Dec. 20, 1994
*Negative Adjustable Regulator
*External Node Designations
*node 1: VREF (OUTPUT)
*node 2: Ground (Common)
*node 3: Line Voltage
ECCX 131 2 135 2 -1.0
VXX 133 2 DC 0
FSET6 2 135 VSENS2 1
FPP 3 2 VXX 1.0
R_YY 31 2 1e6
R_XX 15 2 1e8
R_ZZ 36 2 1e6
RXX 1 2 1e8
VSENS1 10 1 DC 0
ISET 2 15 DC 1e-3
DON1 15 16 DMOD1
VSENS2 16 19 DC 0
DON2 15 17 DMOD1
EON2 18 2 3 2 -1
FYY 3 2 VSENS1 1
DON3 15 27 DMOD1
VDROP3 28 27 DC 2
EON3 28 2 3 2 -4
ELINE 13 42 66 2 1
FSET2 2 36 VSENS2 1
DSC1 36 35 DMOD1
RCL1 36 37 10
DSC2 37 38 DMOD1
ESCCON 38 39 30 2 1
VSCCON 39 40 DC 0
FSC 19 2 VSCCON 1
FSET3 2 31 VSENS2 1
DOV1 31 32 DMOD1
EOV1 32 2 3 1 -1
DOV2 31 33 DMOD1
ISET4 2 30 DC 1e-3
ELOAD 41 2 77 2 -1
ERIPPLE 42 41 72 2 1
EREF 12 13 19 2 -1
E3 52 2 3 2 1
CBYPS 54 2 0.001
VORB 60 54 DC 0
RB 60 2 1e3
RBR 72 2 1000
CBS2 52 71 1
RSTEP 77 2 1
FRB 2 65 VORB 1
DRB2 65 67 DMOD1
VXRB 67 68 DC -1
EXRB 68 2 1 2 -1
DRB1 65 66 DMOD1
RB1 66 2 1000
.MODEL DMOD1 D
*-- DMOD1 DEFAULT PARAMETERS
*IS=1e-14 RS=0 N=1 TT=0 CJO=0
*VJ=1 M=0.5 EG=1.11 XTI=3 FC=0.5
*KF=0 AF=1 BV=inf IBV=1e-3 TNOM=27
EXX 132 131 3 131 0.000153846
RST6 135 2 10000
RIQX 133 132 RQIX 153846
.MODEL RQIX R TC1=-0
RSET 19 2 RSET 1250
.MODEL RSET R TC1=-6e-05 TC2=-4.47e-07
RS1 10 12 0.003
VDROPX 18 17 1.26
CTRAN 19 2 2.4e-09
HSENSE1 35 2 VSENS1 -12.5
RISC 30 2 RISC 10000
.MODEL RISC R TC1=-0.002
ROV 34 2 25000
VOV 33 34 20
EOV2 2 40 34 2 0.25
FIQD 3 2 VSENS1 2e-06
RY 52 54 4e+06
RA 72 73 2163.76
RYR 71 72 3.16128e+06
CRA 52 73 5.03107e-11
HSTEP 76 2 VSENS1 0.2
CSTEP 76 77 1e-05
.ENDS lm337h

[lacy]

Just a side note. Your boss sounds like a boss I used to work for. Only a real dumba** would buy from an unknown overseas company to begin with. Then on top of that not get any schematics for the items he bought that makes him a double dumba**.

Why not send them back and make the manufacturer do their job over. If I paid money for something that doesn't work I surely wouldn't try to fix it myself. I would send it back under warranty and make them replace it or repair it.

Anyway, I just had to spout about how smart employers are. If employer intelligence was electricity we wouldn't be able to turn on a 10W light bulb.

[moxygen]

Hey thanks Lacy,
I really appreciate your help.
It's not so much that she is dumba**.
More like a cheapa** trying to save money.
I don't think she can send them back.
The problem was that one of the students tried to get 30volts out of the supply (15v+ and 15-).
Some how the capacitors in the power supply blew up and She wanted to know why.
Your right, buy from a reputable company that  provides documentation, technical support, warrarnty.
Oh well I'm just a student worker (working on my associates in electrical engineering) I'm sure I'll be fine.

[lacy]

Just one other thing and I will leave you alone. I would like to know if the model worked for you. Let me know either way once you get it incorporated into your version and have had a chance to test it.

[moxygen]

Hey lacy,
Thanks again for the LM337 spice model.
there is one problem though.
The values are off by a high percentage (more than 10%).

[moxygen]

Hey Lacy,
I found a more acccurate LM337 spice model
once again I apprieciate your help.
I'll give you the subcircuit since you might need it some day.
Very accurate it's within two percent

.SUBCKT LM337K 8      1    19
*Connections  Input  Adj. Output
*LM337 negative voltage regulator
.MODEL QN NPN (BF=50 TF=1N CJC=1P)
.MODEL QPOUT PNP  (BF=50 TF=1N RE=.2 CJC=1P)
.MODEL QP PNP CJC=1P  TF=2N
.MODEL DN D
.MODEL D2 D BV=12 IBV=100U
R10 25 6 1K
Q3 8 17 16 QPOUT
Q4 8 25 17 QP
R18 19 17 250
R19 19 16 .3
G1 8 6 1 18 .1
C7 6 2 .04U
R24 2 8 100
I_ADJ 0 1 65U
R26 8 25 200K
Q5 25 4 19 QP
R27 16 4 200
R28 7 4 7K
D1 8 7 D2
D2 8 6 DN
V1 18 19 1.25
.ENDS

[lacy]

Thanks for the feedback. My  model came from Multisim 2001 and is probably an older model. I am glad you were able to find a better model and I am really thankful that you would post it. I am also glad your project is coming along for you and I wish you all the luck in the world in solving your problem.