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From: jmuchow@SPAMMENOTcamlight.com (John Muchow)
Subject: Re: Question about linear derating factor for MOSFETs
Date: Tue, 12 Nov 2002 01:40:14 GMT
Organization: MindSpring Enterprises
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X-Server-Date: 12 Nov 2002 01:45:40 GMT
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>>>Why use a $52 fet, when you could use a few $1 fets, and spread the
>>>heat around a lot better to boot? For about $1, you can get a 150 watt
This is my big debate now. The biggest reason has been the ease of
wiring up the devices. That SOT-227 case lets me easily run the 8AWG
wires. I would either have to get a PCB done or jury-rig some
kind of perfboard setup with as large a gauge wire as I could soldered
directly to the terminals of the TO-220's.
The spreading around of the heat is a very good point though.
The max current will be about 35A so I guess I could parallel up a
bunch to divide up that into something I could handle with smaller
gauge wiring but it's the physical setup of the devices and their
wiring that still bothers me. I want it to be a durable unit that I
can (hopefully) easily build a few of. The idea of this thing is
spreading among my R/C car friends...might have to build 6 or 7 of
them. The easier it is, the better.
If you had any good ideas...I'm all ears. :-)
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