From owner-freebsd-hackers  Mon Mar 15 12:41:55 1999
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Date: Mon, 15 Mar 1999 12:41:35 -0800 (PST)
From: Matthew Dillon <dillon@apollo.backplane.com>
Message-Id: <199903152041.MAA02388@apollo.backplane.com>
To: "Kenneth D. Merry" <ken@plutotech.com>, smp@csn.net,
	hackers@FreeBSD.ORG
Subject: Re: power-off without halt
References: <199903151941.MAA20523@panzer.plutotech.com> <199903152001.MAA02187@apollo.backplane.com>
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:    e.g. IT=CV, T=CV/I.  Assume 60W @ 110V yields half an amp.  The caps on
:    the diode bridge will probably level off at 50V or so and the switching
:    regulator will be able to regulate down to, say, 20V.  So, for example:
:
:	T=CV/I T=(1000uF * 20V)/500mA = 40 mS of good power after AC failure.

    Oops.  that should be 30V.  50V-20V = 30V.

	T=CV/I T=(1000uF * 30V)/500mA = 60 mS of good power after AC failure.

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>


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