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From: "Spehro Pefhany"
Subject: Re: V regulator input cap size?
References: <0001HW.B9D991AD000C5917163F7590@news.covad.net> <firstname.lastname@example.org> <0001HW.B9D9CD54001A5D15163F7590@news.covad.net> <0001HW.B9DAE8B7003F6E14163F7590@news.covad.net> <3DC1A954.email@example.com> <1%hw9.136243$Q3S.firstname.lastname@example.org> <3DC1AF48.email@example.com>
User-Agent: tin/pre-1.4-19990216 ("Styrofoam") (UNIX) (Linux/2.2.14 (i586))
Date: Fri, 01 Nov 2002 00:54:28 GMT
NNTP-Posting-Date: Thu, 31 Oct 2002 19:54:28 EST
In sci.electronics.design Fred Bloggs wrote:
> Okay- thnx for replying. I suspected as much. You are aware that the
> modern relays cannot withstand more than 110% nominal at continuous
Derate the Ta(max) a bit then, easy without the "Easy Bake Oven" effect
of wasted power. 85'C -> 60'C would give a lot of margin.
> That is why I think a current source drive is best given a 30%
> spread on line voltage.
Not very often used on relay coils, particuarly with a linear regulator.
Cost factors and such like. Probably the line voltage range is what drives
the relay specs rather than the other way around.
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