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From: Glenn Ashmore
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Subject: Re: Voltage doubler alternatives?
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NNTP-Posting-Date: Tue, 21 Jan 2003 16:58:52 con
Date: Tue, 21 Jan 2003 17:01:10 -0500
Tom Bruhns wrote:
> 28V for an IRL3716?? The data sheet I just got from IR says 20V
> _MAX_ for Vds and Vgs both. I'd suggest you have another look at
> the data sheet. The published curves only go up to 10V gate to
> source voltage, and show only a very modest decrease in resistance
> between 4.5V and 10V. About 0.003 ohms at 10V at 25C? That's
> about the same as 2 feet of 12ga wire. If you really, really need
> lower ON resistance, I'd suggest you parallel more IRL3716's. If
> you put 28V on the gate, you're just begging for _very_ poor
> reliability, and I doubt the resistance is even 10% lower than at
> 10V on the gate.
OK, 26V. 24V minimum. I think VGs is measured above source voltage
which in this case is 13.5V max and I do plan to parallel a pair of them
but more for redundancy than load sharing. I need the low ON
resistance because I am trying to push 2A to the end of 120' of #14 with
less than a 3% drop. That leaves very little for resistance in the
I am torture testing a set right now with 7 amps cycling on/off every 15
seconds. They have been running fine for the last 72 hours and they are
barely warm. Considering that in service the load will be 2A cycled
twice a day I figure I have simulated about 50 years of use. Once this
test is over I am going to run VDS up to the limit and see how well they
would do if someone forgets to turn off the master breaker before
putting their battery charger on an equalizing program.
I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com
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