How can I modify this Ltspice 2SK170 model to lower the IDSS to 5 ma ? - diyAudio
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Old 8th October 2012, 07:24 AM   #1
tessier is offline tessier  Canada
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Default How can I modify this Ltspice 2SK170 model to lower the IDSS to 5 ma ?

Hi

How can I modify this Ltspice 2SK170 model to lower the IDSS to 5 ma ?

.model J2sk170 NJF(Beta=59.86m Rs=4.151 Rd=4.151 Betatce=-.5 Lambda=1.923m Vto=-.5024 Vtotc=-2.5m Cgd=20p M=.3805 Pb=.4746 Fc=.5 Cgs=25.48p Isr=84.77p Nr=2 Is=8.477p N=1 Xti=3 Alpha=10u Vk=100 Kf=111.3E-18 Af=1)

Thanx

Paul
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Old 8th October 2012, 08:24 AM   #2
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Take a look at the "J.JFET Transistor" entry in the LTSpice "Help" files. I think you want to adjust "Vto" and "Beta" until you get a transfer characteristic (plot of Vgs versus Id, at some constant Vds greater than Vto) that is to your liking.

Dale
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Old 8th October 2012, 08:47 AM   #3
tessier is offline tessier  Canada
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Hi

Here is the new model for the 2SK170-GR, it have a IDSS of 5.04 ma. with a
9 volt dc source.

.model J2sk170gr NJF(Beta=30m Rs=4.151 Rd=4.151 Betatce=-.5 Lambda=1.923m Vto=-.4274 Vtotc=-2.5m Cgd=20p M=.3805 Pb=.4746 Fc=.5 Cgs=25.48p Isr=84.77p Nr=2 Is=8.477p N=1 Xti=3 Alpha=10u Vk=100 Kf=111.3E-18 Af=1)

Thanx

Paul
Attached Images
File Type: gif 2sk170-br idss test.gif (8.5 KB, 268 views)

Last edited by tessier; 8th October 2012 at 08:51 AM.
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Old 9th October 2012, 04:33 PM   #4
jcx is offline jcx  United States
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you probably want to fit to a real fet's measurements: Idss, Vth aren't independent for a given part # they vary together
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