How to Add a SubCkt in Multisim10.0 ????

[ranjeet]

can we Add add a SubCkt Pspice model Directly to Multisim ?? I want to make sure that the models for pspice and multisim are the same, how would I convert the part from orcad's pspice library in to multsim???
The specific parameters for the orcad part are:
*********

.SUBCKT SPD15N06S2L-64 drain gate source Tj Tcase PARAMS: dVth=0 dRdson=0 dgfs=0 dC=0 Zthtype=0

.PARAM Rs=3.47m     Rg=1.2       Rd=50u       Ls=7n        Ld=1n        Lg=6n        Rm=895u
.PARAM Inn=8        Unn=4.5      Rmax=85m     gmin=6.42
.PARAM RRf=497m     Rrbond=845m  Rtb=46.3     g2=930m
.PARAM act=1.58

.FUNC   Pb(I,dT,Rb)  {Rb/(2*Rtb)*(I-limit(dT/(max(I,1n)*Rb)+RRf*I*g2,0,I))**2}

X1  d1 g s Tj S2_55_l_var PARAMS: a={act} dVth={dVth} dR={dRdson} dgfs={dgfs} Inn={Inn} Unn={Unn}
                                        +Rmax={Rmax} gmin={gmin} Rs={Rs} Rp={Rd} dC={dC} Rm={Rm} heat=1
Rg    g1     g    {Rg}  
Lg    gate   g1   {Lg*if(dgfs==99,0,1)}
Gs    s1     s    VALUE={V(s1,s)/(Rs*(1+(limit(V(Tj),-200,999)-25)*4m)-Rm)}
Rsa   s1     s    1Meg
Ls    source s1   {Ls*if(dgfs==99,0,1)}
Rda   d1     d2   {Rd}
Ld    drain  d2   {Ld*if(dgfs==99,0,1)}
Rsb   source s1    10
Rga   gate   g1    10
Rdb   drain  d2    10

G_TH  0    Tb  VALUE =  {Pb(abs(I(Ls)),V(Tj,Tcase),Rrbond*(1+(limit((V(Tb)+V(Tj))/2,-200,999)-25)*4m))}
Cthb  Tb      0               487.73u
Rthb  Tb      Tj              {Rtb}
Rth1  Tj      t1              {18.72m+limit(Zthtype,0,1)*6.92m}
Rth2  t1      t2              {207.42m+limit(Zthtype,0,1)*76.77m}
Rth3  t2      t3              {700.44m+limit(Zthtype,0,1)*282.02m}
Rth4  t3      t4              {920.76m+limit(Zthtype,0,1)*298.49m}
Rth5  t4      Tcase           {519.92m+limit(Zthtype,0,1)*168.54m}
Cth1  Tj      0               16.498u
Cth2  t1      0               61.203u
Cth3  t2      0               507.223u
Cth4  t3      0               278.426u
Cth5  t4      0               39.988m
Cth6  Tcase   0               88.3m

.ENDS


Suggest me the Multisim model of the SPD15N06S2L-64

Thanks,
Ranjeet

[nestor-sg]

Most of the Pspice code should work with no problems in Multisim when you create a new component. However, if you come across any argument or parameter that is not working then let us know, in most cases is somehow simple to fix. Multisim is based in SPICE and XSPICE but it supports Pspice.

In order to create a new component, follow this tutorial:
http://zone.ni.com/devzone/cda/tut/p/id/3173

It will show step by step how to create a component.

[ranjeet]

hello ,

when i'm trying to simulate a circuit in multisim10 its ending up with errors ,the problem is with the FET( SPD15N06S2L) model i'm using, becoz when i'm trying to simulate it with FET model taken from multisim library the circuit is working fine . i've tried many possible ways like model maker and copying the FET model directly to another FET .. but nothing is working . I'm attaching the Circuit and the FET models suggested by EWB and Infineon(FET manufacturer).

Please anyone try to simulate the circuit attached and let me know what exactly happening . i would be grateful .

Thanks ,

Ranjeet

[lacy]

I am going to take a look at this and see what I can come up with, but I can make no guarantees. Also, this may take a while so patience would be greatly appreceiated.

One question: The circuit that you posted has the working FET in it and you want to replace it with the models you posted. Is this a correct assumption?

Message Edited by lacy on 03-16-2008 09:48 PM

[ranjeet]

Thank you for your reply ...

 Yes you are right , the existing circuit contains the working FET(BUZ), taken from multisim library . i wanted to replace the model with the one attached(SPD15N06S2L-64) .

 And also the Oscillator3(OSC3) connected first channel to input waveform(Pulse) and second channel to gate voltage of FET.  the second channel should vary with the first channel,

Looking forward for your suggestions ..

Thanks ,

Ranjeet

[lacy]

I am sorry, but I have tried to get this model to work and I have had no success in doing so. I am going to continue examing this. I am going to try and search for a different model that may work. I will let you knoiw if I come up with something different. I do not have any hope that this particular model is going to work at all. I am not a model guru so maybe there is a model guru out there that can take a better look at this model and get it going for you. 

I will get back to you if I find something that works.