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From: keithw86 on 13 Jul 2010 14:23
On Jul 13, 10:29 am, m II <c...(a)in.the.hat> wrote:
> dagmargoodb...(a)yahoo.com wrote:
> >> Deep Friar: a very philosophical monk.
>
> > Int'l RectiFryer: a very different kind of monk?
>
> Specializes in the Sine of the Cross.

Holy smoke.
From: ChairmanOfTheBored on 13 Jul 2010 16:42
On Tue, 13 Jul 2010 11:23:16 -0700 (PDT), "keithw86(a)gmail.com"
<keithw86(a)gmail.com> wrote:

>On Jul 13, 10:29�am, m II <c...(a)in.the.hat> wrote:
>> dagmargoodb...(a)yahoo.com wrote:
>> >> Deep Friar: a very philosophical monk.
>>
>> > Int'l RectiFryer: a very different kind of monk?
>>
>> Specializes in the Sine of the Cross.
>
>Holy smoke.

Had some of that this morning.
From: krw on 13 Jul 2010 18:55
On Tue, 13 Jul 2010 13:42:04 -0700, ChairmanOfTheBored
<RUBored(a)crackasmile.org> wrote:

>On Tue, 13 Jul 2010 11:23:16 -0700 (PDT), "keithw86(a)gmail.com"
><keithw86(a)gmail.com> wrote:
>
>>On Jul 13, 10:29�am, m II <c...(a)in.the.hat> wrote:
>>> dagmargoodb...(a)yahoo.com wrote:
>>> >> Deep Friar: a very philosophical monk.
>>>
>>> > Int'l RectiFryer: a very different kind of monk?
>>>
>>> Specializes in the Sine of the Cross.
>>
>>Holy smoke.
>
> Had some of that this morning.

I'm sure you did, DimBulb. You toked up just before posting here, as usual.
From: Michael on 14 Jul 2010 15:35
On Jul 13, 7:48 am, Joerg <inva...(a)invalid.invalid> wrote:
> John Larkin wrote:
> > On Tue, 13 Jul 2010 06:19:55 -0500, "Tim Williams"
> > <tmoran...(a)charter.net> wrote:
>
> >>http://www.fairchildsemi.com/ds/FG%2FFGA30N120FTD.pdf
>
> >> Maximum collector current 60A at 25C.  I don't see any condition, taking a reasonable guess at Vce(sat) at max Tj, where this could possibly dissipate anywhere near the power rating of 339W (also at Tc = 25C).  In fact, the typical output characteristics show it should be closer to Vcesat = 3V, Ic = 120A, Vg = 15V.  So why pick 60A?
>
> >> More BS?  What's the real rating?
>
> > I'd go for the headline: 30 amps. That's achievable, without a lot of
> > switching losses or water-cooled diamond heat sinks. The 339 watts is
> > absurd.
>
> >> Buy from someone else?  Ha, no one else even has honest ratings...
>
> > Looks like everybody has to keep up with IR. They should add to "Abs
> > max ratings"
>
> > MAXIMUM LIES   12  typ
>
> It can get worse. I saw an audio amp in a blister pack, IIRC at a
> Walmart. Said 1000 watts PMPO on the label and the power supply was a
> wall wart ...
>
> --
> Regards, Joerg
>
> http://www.analogconsultants.com/
>
> "gmail" domain blocked because of excessive spam.
> Use another domain or send PM.


That must be some high efficiency wall wart. (grin)

Michael
From: quiettechblue on 16 Jul 2010 01:53
On Tue, 13 Jul 2010 06:19:55 -0500, "Tim Williams"
<tmoranwms(a)charter.net> wrote:

>http://www.fairchildsemi.com/ds/FG%2FFGA30N120FTD.pdf
>
>Maximum collector current 60A at 25C. I don't see any condition, taking a reasonable guess at Vce(sat) at max Tj, where this could possibly dissipate anywhere near the power rating of 339W (also at Tc = 25C). In fact, the typical output characteristics show it should be closer to Vcesat = 3V, Ic = 120A, Vg = 15V. So why pick 60A?
>
>More BS? What's the real rating? Buy from someone else? Ha, no one else even has honest ratings...
>
>Tim

Yes.

This is a kind of cyclical thing in electronics. Specsmanship gets
quoting ever more unreasonable values driven by things like "infinite
heat sinks". Eventually there are too few old dogs to keep the punks
from believing the spurious ratings. Failures and then lawsuits
follow like Nemisis following Hubris. Then the specs get more
realistic again for a while, then sales critters insist on bending
them again. There is a deficit of memory in the beauracracies that
causes this oscillation.
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