From: Winfield Hill
Subject: Re: zero-power toggle circuit; was, how to master electronics
Date: 20 Nov 2002 08:27:33 -0800
Organization: Rowland Institute
References: <3DD39D90.email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
X-Newsreader: Direct Read News 4.11
> I spent more time, but didn't get much further with several of the
> MOSFET types. Then I discovered the main cause. I received a message
> from a professional CM user, Ron Berthiaume, who subscribes to a CM
> mailing list I use. Turns out CM has screwed up some of the MOSFET
> classifications, and as luck would have it, IRF9513 was one of them.
> I'm not confident of summarising it accurately, so I've pasted most of
> Ron's analysis here:
> 1) The IRF9513 FET doesn't work in circuit. (Circuitmaker Problem) I
> can't find an IRF9513 datasheet but, based on simulation, the device
> appears to be a depletion mode FET not an enhancement mode FET. ...
I'm not sure what part Ron is referring to, but the IRF9513 is a 60V,
1.6-ohm version of the 9510, and years ago it was listed by IR on the
same data sheet. It appears to have been discontinued for some time.
Of course that doesn't mean CM may not have mistakes in its model.
You can test models through some simple tests, such as Vgs Id current
sweeps, etc. These are easily done by connecting the gate to drain
and measuring that Vgs(on) voltage while sweeping the current.
You could also try CM's IRF9510 model. The 9520 9530 and 9540 are
progressively larger FETs in the same family. Do you only have a
limited number of models?