diode sinking

Lico · 7th January 2005, 05:40 PM

Hi, I have some MUR860 diodes for a 3886 gc, do I need heatsinks for them or will current be low enough that they can live without them?

chipco3434 · 7th January 2005, 06:04 PM

I have no technical information other than my experience. They don't even get warm with a 3875 driven hard. So, no.

wxn · 7th January 2005, 08:09 PM

A pair of small heatsinks surely won't hurt. LM3886 has twice the current capability of LM3875

thomas997 · 8th January 2005, 02:20 AM

Quote:

Originally posted by wxn
A pair of small heatsinks surely won't hurt. LM3886 has twice the current capability of LM3875

I think hes talking about the diodes though, which shouldnt need heatsinks..

If they do, buy some bigger diodes.

tiroth · 8th January 2005, 02:45 AM

If the amp is drawing twice the current, the diodes will have twice the dissipation and be twice as hot! In reality, there likely won't be a large difference unless you are pushing the amp and using all that extra current capability, but the point is quite valid.

cpemma · 8th January 2005, 11:48 PM

They're in a TO220 case, typical thermal resistance (bare tab) 60C/W. Averaging 2A (which is a lot when you consider they're only conducting half the time) they'd waste 2W and get damned hot but survive.

So do the maths for your amp.

Lico · 10th January 2005, 04:06 AM

thanks guys

7th January 2005, 05:40 PM	#1
Lico diyAudio Member Join Date: Oct 2003 Location: New Jersey	diode sinking Hi, I have some MUR860 diodes for a 3886 gc, do I need heatsinks for them or will current be low enough that they can live without them?

7th January 2005, 08:09 PM	#3
wxn diyAudio Member Join Date: Sep 2003 Location: Vilnius	A pair of small heatsinks surely won't hurt. LM3886 has twice the current capability of LM3875 __________________ Nothing is as simple as it seems

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7th January 2005, 06:04 PM	#2
chipco3434 diyAudio Member Join Date: Feb 2004 Location: Racine, Wisconsin	I have no technical information other than my experience. They don't even get warm with a 3875 driven hard. So, no.

8th January 2005, 02:45 AM	#5
tiroth diyAudio Member Join Date: Dec 2001 Location: Pittsburgh, PA, USA	If the amp is drawing twice the current, the diodes will have twice the dissipation and be twice as hot! In reality, there likely won't be a large difference unless you are pushing the amp and using all that extra current capability, but the point is quite valid.

8th January 2005, 11:48 PM	#6
cpemma diyAudio Member Join Date: Jul 2003 Location: S Yorkshire OK	They're in a TO220 case, typical thermal resistance (bare tab) 60C/W. Averaging 2A (which is a lot when you consider they're only conducting half the time) they'd waste 2W and get damned hot but survive. So do the maths for your amp.

10th January 2005, 04:06 AM	#7
Lico diyAudio Member Join Date: Oct 2003 Location: New Jersey	thanks guys

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