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Better power MOSFET models in LTSpice
Better power MOSFET models in LTSpice
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Old 17th April 2019, 05:21 AM   #231
IanHegglun is offline IanHegglun  Australia
diyAudio Member
Join Date: Mar 2017
Default LTspice IRFP240 + IRFP9240 plots with measured gm's

Originally Posted by indra1 View Post
... Attached are the measured Id/Vgs curves of typical Vishay parts made by another member, published in Pass forum a few years ago.
Hi indra1,

Thanks for posting the measured curves of the IRFP240, IRFP9240 and IRFP9140. Very useful to check the Vishay Datasheets and my models from those datasheets.

I used GraphGrabber to capture the data to get Tables in LTspice to compare with my models. The jigs are attached. BTW in my white paper I explain how to capture data to get it into LTspice. Plotting measured gm's is very useful!

The data from these plots fits myIRFP240 model well -- after trimming out Vto variations for the sake of comparisons.

My IRFP9240 had a gm and Kp about 1.3x too high, Reducing the Kp of my p- model brings it to about the same as the n- model (6A/V^2).

The attached gm screen plot shows the measured p- and n- gm's. The 4 measured plots are the highest and lowest from the p- and n-measured data. Model gm's (smooth) after the p- has been scaled by dividing by 1.3. No scaling used for the n-channel.

Better power MOSFET models in LTSpice-compare-extractions-irfp240-irfp9240-gm-png
Thanks again. This has been a big help for me to compare my IRFP240/9240 models with real data. I haven't updated my model yet. I'll check first with Bob Cordell if he is doing an update and sync models if we can. In the meantime you can change my IRFP9240 model Kp to 6 and it will be close to the measured curves (and maybe use Bob's Vto of -3.76).

BTW the attached jig also contains captured data for the IRFP9140 curves.

All the best
Attached Images
File Type: png Compare-extractions-IRFP240-IRFP9240-gm.png (16.7 KB, 75 views)
File Type: png Compare-extractions-IRFP240-IRFP9240.png (21.4 KB, 59 views)
Attached Files
File Type: zip Compare-extractions-IRFP240-IRFP9x40.zip (12.0 KB, 5 views)

Last edited by IanHegglun; 17th April 2019 at 05:27 AM. Reason: change to 9640 to 9240
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Old 19th April 2019, 03:56 PM   #232
indra1 is offline indra1  Indonesia
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Location: Bogor
Great Ian, glad to be able to contribute something. I'll let the folks in Pass forum know once the updated IRF240/9140/9240 model is ready.
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Old Yesterday, 01:23 PM   #233
UltimateX86 is offline UltimateX86  France
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Join Date: Jun 2004
Location: France
Better power MOSFET models in LTSpice

i know that ZVP2110G are not power mosfet, but do you have a correct model ?

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Old Yesterday, 01:31 PM   #234
FdW is offline FdW  Netherlands
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Location: Both feet on the ground (near Gouda)
Better power MOSFET models in LTSpice
Check here ZVP2110G (P Channel ≥ 100V)
| Diodes Incorporated
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Old Yesterday, 09:56 PM   #235
IanHegglun is offline IanHegglun  Australia
diyAudio Member
Join Date: Mar 2017
Converted to VDMOS:

*VDMOS with subthreshold (c) Ian Hegglun Apr 2019
.model ZVP2110G VDMOS (pchan Rg=65 Vto={-(2.8-6m*(temp-25))} Lambda=6m
+ Rs={2*(1+3.5m*(temp-25))} Kp={0.17/(1+8.8m*(temp-25))}
+ Ksubthres={0.15*(1+4m*(temp-25))} Mtriode=0.5 Rd={2.5*(1+5m*(temp-25))}
+ Cgdmax=20p Cgdmin=3p a=0.5 Cgs=140p Cjo=60p Tnom=Temp
+ m=0.5 Vj=0.75 N=3 Is=5p Rb=1 Vds=-100 Ron=8 Qg=2nC mfg=DioInc1904)
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