How to write LTSPICE models for FQPF9P25, FQP4P40 and FQP3P50 mosfets

[zintolo]

Hi,

I've searched far and wide for LTSPICE models of FQPF9P25, FQP4P40 and FQP3P50 mosfets, but with no luck.
Here you can find the datasheets:
FQPF9P25 ( https://www.mouser.it/datasheet/2/149/FQPF9P25-110839.pdf )
FQP4P40 ( https://www.mouser.it/datasheet/2/308/1/FQP4P40_D-2314130.pdf )
FQP3P50 ( https://www.mouser.it/datasheet/2/308/1/FQP3P50_D-2314161.pdf )

I would like to ask how can I write the models for those three mosfets EG starting from the IRFP9240:

.model IRF9240 PMOS(Level=3 Gamma=0 Delta=0 Eta=0 Theta=0 Kappa=0.2 Vmax=0 Xj=0
+ Tox=100n Uo=300 Phi=.6 Rs=80.81m Kp=10.53u W=1.9 L=2u
+ Vto=-3.807 Rd=.2515 Rds=888.9K Cbd=1.436n Pb=.8 Mj=.5 Fc=.5
+ Cgso=4.933n Cgdo=51.23p Rg=.6716 Is=179.4E-18 N=2 Tt=325n)

and the datasheet is here:
IRF9240 ( https://www.vishay.com/docs/91239/sihfp924.pdf )

I've found this page: https://people.ece.ubc.ca/robertor/Links_files/Files/ICCAP-2008-doc/icmdl/icmdl05a8.html
but didn't helped much.

Thanks in advance

Roberto

Thanks

 

[nemool]

Hi,

I've searched far and wide for LTSPICE models of FQPF9P25, FQP4P40 and FQP3P50 mosfets, but with no luck.

There are only FQP3P50, FQPF9P25:

 

[jackinnj]

Seek and ye shall find: https://www.diyaudio.com/community/threads/better-power-mosfet-models-in-ltspice.266655/

 

[zintolo]

I've got this message:

    * Unrecognized parameter "tc1" -- ignored
    * Unrecognized parameter "tc2" -- ignored
    * Unrecognized parameter "trs1" -- ignored
    * Unrecognized parameter "trs2" -- ignored
    * Unrecognized parameter "cjo" -- ignored
    * Unrecognized parameter "m" -- ignored
    * Unrecognized parameter "vj" -- ignored
    * Unrecognized parameter "xti" -- ignored
    * Unrecognized parameter "eg" -- ignored
    * Unrecognized parameter "trs1" -- ignored
    * Unrecognized parameter "trs2" -- ignored
    * Unrecognized parameter "tc1" -- ignored
    * Unrecognized parameter "tc2" -- ignored
    * Unrecognized parameter "xj" -- ignored
    * Unrecognized parameter "nch" -- ignored
    * Unrecognized parameter "vsat" -- ignored
    * Unrecognized parameter "drout" -- ignored
    * Unrecognized parameter "delta" -- ignored
    * Unrecognized parameter "pscbe2" -- ignored
    * Unrecognized parameter "vth0" -- ignored
    * Unrecognized parameter "voff" -- ignored
    * Unrecognized parameter "nfactor" -- ignored
    * Unrecognized parameter "lint" -- ignored
    * Unrecognized parameter "dlc" -- ignored
    * Unrecognized parameter "cgsl" -- ignored
    * Unrecognized parameter "cgdl" -- ignored
    * Unrecognized parameter "cf" -- ignored
    * Unrecognized parameter "ckappa" -- ignored
    * Unrecognized parameter "kt1" -- ignored
    * Unrecognized parameter "kt2" -- ignored
    * Unrecognized parameter "ua1" -- ignored
    * Unrecognized parameter "nj" -- ignored
Instance "m2": Length shorter than recommended for a level 1 MOSFET.
Instance "m1": Length shorter than recommended for a level 1 MOSFET.

 

[zintolo]

Is this reasonable? I tried to write parameters from datasheet, but some are estimated.

.model FQPF9P25 vdmos (pchan VTO=-4 RS=0.0852 KP=4.8 RD=0.456 RG=10 mfg=Fairchild Vds=-250 CGDMAX=1n CGDMIN=27p Cjo=550p IS=6n Rb=0.267 TT=1.762e-06 Cgs=910p Ksubthres=0.1 Ron=.62 Qg=29n)

 

[keantoken]

That BSIM model is not compatible with LTspice.

The model parameters can't be taken directly from the datasheet in most cases. You can estimate but that doesn't produce a very accurate model. It takes specific knowledge to set each parameter.

Look up tutorials on how to create a VDMOS model for the basics.

 

[zintolo]

I've used this tutorial ( http://www.simonbramble.co.uk/lt_spice/ltspice_lt_spice_tutorial_6.htm ) to get values above:

.model FQPF9P25 vdmos (pchan VTO=-4 RS=0.0852 KP=4.8 RD=0.456 RG=10 mfg=Fairchild Vds=-250 CGDMAX=1n CGDMIN=27p Cjo=550p IS=6n Rb=0.267 TT=1.762e-06 Cgs=910p Ksubthres=0.1 Ron=.62 Qg=29n)

From the datasheet I've got:
VTO = VGS on datasheet
KP = transconductance
mfg = manufacturer
Vds = VDSS
CGDMIN = Crss min
CGDMAX = Crss max
CGS = CISS
Ron = RDSon
Qg = total gate charge

Other values to be verified by more experienced people.

 

[jackinnj]

Well, what do you think:

 

[zintolo]

Thanks @jackinnj , do you know how to correct it?
Thanks

 

[jackinnj]

Your model:

.model FQPF9P25 vdmos (pchan VTO=-4 RS=0.0852 KP=4.8 RD=0.456 RG=10 mfg=Fairchild Vds=-250 CGDMAX=1n CGDMIN=27p Cjo=550p IS=6n Rb=0.267 TT=1.762e-06 Cgs=910p Ksubthres=0.1 Ron=.62 Qg=29n)

Let's break down what we are doing, recasting your model:
.model FQPF9P25 vdmos pchan
1) +VTO=-4 RS=0.0852 KP=4.8 These are the DC Level 1 Spice parameters
2) +CGDMAX=1n CGDMIN=27p These are the non-linear gate-drain capacitances
3) +Cjo=550p Cgs=910p These are the gate-source capacitances
4) +RD=0.456 RS = ????? RDS = ????? RG=10 IS=6n Rb=0.267 TT=1.762e-06 N= ???????
5) +MTriode = ??? Ksubthres=0.1 Ron=.62 Qg=29n) Triode Region and Subthreshold conduction

Focus first to get the DC model correct by varying the parameters in lines 1 and 4

Take a look at similar PMOS in the LTSpice Library to get a head start.