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Better power MOSFET models in LTSpice
Better power MOSFET models in LTSpice
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Old 24th December 2014, 04:56 AM   #11
thoglette is offline thoglette  Australia
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Quote:
Originally Posted by RCruz View Post
Thank you
As there's no "like" or "thank you" button in these forums, I have to post to say thanks to the LTSpice team, Kean and Bob.

It's been some years since I played with Mosfet models in spice but I recall getting my fingers burnt by exactly these issues. Simulation was fine, reality was vastly different.
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Old 24th December 2014, 05:32 AM   #12
keantoken is offline keantoken  United States
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What MOSFET models would you guys like to see?
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Old 24th December 2014, 05:44 AM   #13
bimo is offline bimo  Indonesia
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Quote:
Originally Posted by keantoken View Post
What MOSFET models would you guys like to see?
2SK1058, 2SJ162, IRFP240, IRFP9240, IRF540, IRF9540
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Old 24th December 2014, 06:00 AM   #14
keantoken is offline keantoken  United States
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These are the 240/9240 models Cordell put in his last post. There are other models but this is the new VDMOS model which should do everything well. BUT, only a few people have seen it yet. So please verify it to your satisfaction (Cordell has the test jig and everything in his post) before using it for anything important.

Quote:
Originally Posted by Bob Cordell View Post
* VDMOS ksubthres models
*
* IRFP240Ckst VDMOS copyright Cordell Audio December 20, 2014
.model irfp240Ckst VDMOS(nchan Vto=4.0 Kp=4.8 Lambda=0.0032 Rs=0.01 Rd=0.1 Rds=1e7 Cgdmax=2600p Cgdmin=10p a=0.35
+Cgs=1250p Cjo=3000p m=0.75 VJ=2.5 IS=4.0E-06 N=2.4 ksubthres=190m)
*
*
*
* IRFP9240Ckst VDMOS copyright Cordell Audio December 20, 2014
.model irfp9240Ckst VDMOS(pchan Vto=-3.76 Kp=9 Lambda=0.004 Rs=0.064 Rd=0.1 Rds=1e7 Cgdmax=1200p Cgdmin=15p a=0.26
+Cgs=1130p Cjo=2070p m=0.68 VJ=2.5 IS=4.0E-06 N=2.4 ksubthres=107m)
*
PS. I didn't actually do much work, I just expressed enthusiasm mostly, hesitant to mess with the models because I knew I couldn't do better than Ian or Cordell and didn't see a way to help with the problems that were coming up. Now that the dust is settling a bit, I think I will try out the new model.
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Last edited by keantoken; 24th December 2014 at 06:11 AM.
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Old 24th December 2014, 07:37 AM   #15
bimo is offline bimo  Indonesia
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Quote:
Originally Posted by keantoken View Post
These are the 240/9240 models Cordell put in his last post. There are other models but this is the new VDMOS model which should do everything well. BUT, only a few people have seen it yet. So please verify it to your satisfaction (Cordell has the test jig and everything in his post) before using it for anything important.



PS. I didn't actually do much work, I just expressed enthusiasm mostly, hesitant to mess with the models because I knew I couldn't do better than Ian or Cordell and didn't see a way to help with the problems that were coming up. Now that the dust is settling a bit, I think I will try out the new model.
I tried Bob Cordell's model to my amp, THD rise a bit.
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Old 24th December 2014, 07:51 AM   #16
davidsrsb is offline davidsrsb  Malaysia
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I tried Bobs THD test and added an old model pair for comparison. The VDMOS is really close and shows just how poor the old model was. I can see how the very abrupt transition of the old model could give very low THD simulation if you get the biasing just right

Thanks very much for this, now I need some more models
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Old 25th December 2014, 12:31 AM   #17
Ray Waters is offline Ray Waters  United States
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Quote:
Originally Posted by bimo View Post
I tried Bob Cordell's model to my amp, THD rise a bit.
If the rise in distortion matches what is really happening in the amp, then that is a good thing (from a simulation standpoint).
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Old 25th December 2014, 12:44 AM   #18
EUVL is offline EUVL  Europe
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Quote:
Originally Posted by keantoken View Post
What MOSFET models would you guys like to see?
MOSFETs

2SK1530, 2SJ201
2SK2013, 2SJ313


JFETs

2SK170, 2SJ74
2SK246, 2SJ103
J111, J174
2SK369
2SK117
LU1014
BF862

i.e. all the usual suspects, even though some are NOS .....


Many thanks in advance,
Patrick
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Old 25th December 2014, 12:49 AM   #19
keantoken is offline keantoken  United States
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I made a mistake when starting this thread, I said FET and not MOSFET. I changed the references in the post but I wasn't able to edit the thread title. The improvements are to the MOSFET model, so won't work for Jfet models.
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Old 25th December 2014, 01:24 AM   #20
Bob Cordell is offline Bob Cordell  United States
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Quote:
Originally Posted by bimo View Post
I tried Bob Cordell's model to my amp, THD rise a bit.
Interestingly, I had also noticed a slight rise in distortion when I used the EKV model instead of the old VDMOS model. I found it to be a bit non-intuitive.

Merry Christmas!

Bob
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