The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: "Phil Allison"
References: <email@example.com> <firstname.lastname@example.org> <email@example.com>
Subject: Re: Thermal runaway: please settle this dispute!
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
X-Mimeole: Produced By Microsoft MimeOLE V5.50.4522.1200
Date: Sun, 5 Jan 2003 11:26:57 +1100
NNTP-Posting-Date: Sun, 05 Jan 2003 11:16:57 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"chris" wrote in message
> "Phil Allison" wrote in message
> > "chris" wrote in message
> > news:firstname.lastname@example.org...
> > > "Phil Allison" wrote in message
> > news:...
> > > Hi, vbe does fall at 2mv/degC but that has nothing to do with thermal
> > > runaway,
> > ** It has EVERYTHING to do with thermal runaway.
> > which is caused by the increase in collector-base leakage
> > > current,
> > ** Only some geraniums maybe.
> > which subsequently gets multiplied by the devices gain
> > > (hfe).Modern silicon devices dont really suffer much from this
> > > problem, its an issue of yesteryears germainium transistors.
> > ** They do not suffer from serious CB leakage but they sure as hell
> > easily suffer from thermal runaway if the heatsink is not adequate and
> > thermal feedback compensation is not applied properly.
> > ............. Phil
> No Phil, that is just plain old overload,
** No Chris - you have not understood my post or the topic.
>if you remove the signal the
> transistor cools down again.
** No signl involved at all. What are you on about ??
In a runaway condition the forward drive
> is not supplied by the signal but by leakage
** Absolute bullshit - what planet are you from ??????
The drive is supplied by the bias cct.
so if you remove the
> signal the transistor does not cool, hence the term runaway.
** Are you still crapping on about geraniums ??
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup