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 22nd October 2012, 09:26 PM #12631 Nelson Pass   The one and only     Join Date: Mar 2001 I am confident that 5W resistors will be fine.
Danger Mouse
diyAudio Member

Join Date: Nov 2011
Location: beautiful Oberpfalz Bavaria
Quote:
 Originally Posted by Nelson Pass This requires a little calculation: The rated junction temperature of the Mosfets is 150C The thermal resistance of the junction to case is 0.69 deg/watt The case temperature + thermal resistance * watts cannot exceed 150C So Watts * .69 < 95C, and Watts < 137 for the case temp = 55C This of course is the absolute maximum. The rule of thumb is that every 10C reduction in junction temperature doubles the life of the transistor.
And how long is the lifetime for eample irfp240 at 55C?

Then I know for how long i have fun with my amps

 2nd November 2012, 01:50 AM #12633 j.leger   diyAudio Member   Join Date: Oct 2009 Location: Nanaimo, BC I have no data. But if it melts down next week you will be lucky. Then you get to build another one. Haha!
 2nd November 2012, 08:01 PM #12634 Danger Mouse   diyAudio Member     Join Date: Nov 2011 Location: beautiful Oberpfalz Bavaria This will be really pity. I really love my F5 hopefully it runs forever. This is why i`m asked. So i can estimate whether my amp will manage it. Or i have to buy some toshiba spares for output.
Nelson Pass
The one and only

Join Date: Mar 2001
Quote:
 Originally Posted by Danger Mouse And how long is the lifetime for eample irfp240 at 55C? Whats your experienced data?
I run them in production at 55 on the sinks. This translates to maybe
65-70 case. They seem to run forever.

 2nd November 2012, 08:59 PM #12636 Danger Mouse   diyAudio Member     Join Date: Nov 2011 Location: beautiful Oberpfalz Bavaria Many thanks for info seems that i will be a lucky guy for a looong time
 3rd November 2012, 03:18 AM #12637 tfender   diyAudio Member   Join Date: Sep 2010 F5 For me [IMG][/IMG]
 3rd November 2012, 11:31 AM #12638 jacco vermeulen   diyAudio Member     Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao F5, the Pink Edition. (what next) __________________ Why does it hurt when I Pee ? (Ay Ay Ay https://www.youtube.com/watch?v=w5fLGWrHouk)
MEGA_amp
diyAudio Member

Join Date: Oct 2003
Water Cooled F5

1.8A, 25V, 10mV DC offset, no temp compensation, no current limiting, bias is rock solid. Planning on turning up the bias until something breaks.
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 6th November 2012, 10:24 PM #12640 JBdV   diyAudio Member   Join Date: Mar 2009 cool!

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