TVS spice model for ESD simulatiom

1)TVS spice model



上圖的原文如下:


TRANSZORB 1N6264(t15ke36c) Model from Vishay

The .SUBCKT model definition contans R-models which are not usable in LTSPICE.
LTSPICE requires a different syntax to add a tempco TC1 and TC2 to a resistor.

Model source:
http://www.vishay.com/docs/88018/1_5ke36c.txt
http://www.vishay.com/diodes/related#spice

PSPICE?, ICAP4?
----------------------------
RBVC 10 0 36000 RBVCMOD
.MODEL RBVCMOD R TC1 = 0.000555556 TNOM = 25

LTSPICE:  TNOM not supported for resistors
---------------
RBVC 10 0 36000 TC1 = 0.000555556
*.MODEL RBVCMOD R TC1 = 0.000555556 TNOM = 25

Create a subcircuit instance from a model-symbol
-------------------------------------------------------------------------
Add a Z-diode to your schematic
Move the cursor over the diode
Press and keep the -button,
       additionally click the right mouse button
       -> A window pops up
Change Prefix: D to Prefix: X
Change Value: D to Value: t15ke36c
OK

A Spiceline ".include 1_5ke36c.txt"
have to be used if the model(.SUBCKT)
is stored in a seperate text file.
Keep this file in the same directory
as your schematic.

黑色部份如下:

**********************************
* Model created by               *
*   Uni.Dipl.-Ing. Arpad Buermen *
*   arpad.burmen@ieee.org        *
* Copyright:                     *
*   Thomatronik GmbH, Germany    *
*   info@thomatronik.de          *
**********************************
* December 2000
*   SPICE3
* Bidirectional
.SUBCKT t15ke36c 1 2
DF 9 90 DFMOD TEMP = 25
.MODEL DFMOD D N = 1 IS = 5E-008 RS = 0.00555575
+ EG = 1.11 XTI = 3
+ CJO = 3.4E-009 VJ = 0.897915 M = 0.5 FC = 0.5
+ TT = 1E-008 TNOM = 25
* Leakage
RLF 9 90 3.492E+007 
RLR 1 9 3.492E+007 
*.MODEL RLMOD R TC1 = 0 TC2 = 0 TNOM = 25
* Breakdown
RBD 90 4 0.533959
EBD 4 3 10 20 1
DBD 3 9 DBDMOD TEMP = 25
* Reverse
DR 9 1 DFMOD TEMP = 25
RBDR 1 94 0.533959
EBDR 94 93 10 20 1
DBDR 93 9 DBDMOD TEMP = 25
.MODEL DBDMOD D IS = 1E-015 N = 0.5 TNOM = 25
IBVC 0 10 0.001
RBVC 10 0 36000 TC1 = 0.000555556  
*.MODEL RBVCMOD R TC1 = 0.000555556 TNOM = 25
RBDX 20 23 0.533959
DBVC 23 22 DBDMOD TEMP = 25
DBVF 22 0 DFMOD TEMP = 25
IBVD 0 20 0.001
L1 90 2 1E-015
.ENDS

右方藍色部份如下:

**********************************
* Model created by               *
*   Uni.Dipl.-Ing. Arpad Buermen *
*   arpad.burmen@ieee.org        *
* Copyright:                     *
*   Thomatronik GmbH, Germany    *
*   info@thomatronik.de          *
**********************************
* December 2000
*   SPICE3
* Bidirectional
.SUBCKT t15ke36c 1 2
DF 9 90 DFMOD TEMP = 25
.MODEL DFMOD D N = 1 IS = 5E-008 RS = 0.00555575
+ EG = 1.11 XTI = 3
+ CJO = 3.4E-009 VJ = 0.897915 M = 0.5 FC = 0.5
+ TT = 1E-008 TNOM = 25
* Leakage
RLF 9 90 3.492E+007 RLMOD
RLR 1 9 3.492E+007 RLMOD
.MODEL RLMOD R TC1 = 0 TC2 = 0 TNOM = 25
* Breakdown
RBD 90 4 0.533959
EBD 4 3 10 20 1
DBD 3 9 DBDMOD TEMP = 25
* Reverse
DR 9 1 DFMOD TEMP = 25
RBDR 1 94 0.533959
EBDR 94 93 10 20 1
DBDR 93 9 DBDMOD TEMP = 25
.MODEL DBDMOD D IS = 1E-015 N = 0.5 TNOM = 25
IBVC 0 10 0.001
RBVC 10 0 36000 RBVCMOD
.MODEL RBVCMOD R TC1 = 0.000555556 TNOM = 25
RBDX 20 23 0.533959
DBVC 23 22 DBDMOD TEMP = 25
DBVF 22 0 DFMOD TEMP = 25
IBVD 0 20 0.001
L1 90 2 1E-015
.ENDS


Global TNOM used for all parameters

.OPTIONS TNOM=25
.include 1_5ke36c.txt
.include 1_5ke36c.txt
.dc I1 -1 1 0.01  (此行依下圖設定即會產生)



電路輸入如下:


simulation後結果


更多的學習資源 :
I have seen that Vishay provides some SPICE models for TVS diodes.
Maybe one of the diodes is similar to the ONSEMI diode.
http://www.vishay.com/diodes/protection-tvs-esd/trans-zorb/related#spice ( 廠商提供資源可以 download)
There has been already a test circuit with a Vishay-model.(
Files > Lib > TRANSZORB_1N6264.asc 
(黃色部份資源必需加入http://tech.groups.yahoo.com/group/LTspice/ discussion group後方能取得)
I have made now a model for the Datasheet 1.5SMC75AT3 .Therefore I have used a B-source with a table() definition for the V-I-characterestic. The values for this table() can be directly read from the datasheet.
http://www.onsemi.com/pub/Collateral/1.5SMC6.8AT3-D.PDF(廠商提供資源可以 download)

The only thing I really guessed were the capacitances C1 and Cjo.
The capacitance C1, Cjo in the model is not specified in thedatsheet. It should be verified by a real measurement. I also added 5nH for the inductance of the leads.

I have used the normal Z-diode symbol. The attribute "Prefix" has to be changed on the placed symbol to become a subcircuit symbol. Ctrl-RightMouseClick on it. Change Prefix:D to Prefix:X

My files are in the Files section of this group.
Files > Lib > Transient Voltage Suppressor 1.5SMC75AT3_test.asc
Keep the model file "1.5SMC75AT3.sub" in the folder where your schematic(.asc) is.