Parallel Lm3886 Question

woody · 12th March 2009, 11:03 AM

When paralleling the LM3886 a small output resistor is used
on each chip. Would the LM3886 be stable if feedback was taken
after this output resistor instead of before it. If so couldn't we
parralle all the pins of the chip except the output pin. It sure would keep the parts count down.

pacificblue · 12th March 2009, 11:29 AM

The ICs would have to be absolutely identical for that. If that were the case, there would be no need for load sharing resistors in the first place. The current state of production technology does not allow for such accuracy, so no, it would not work.

jaudio · 12th March 2009, 11:40 AM

http://www.diyaudio.com/forums/showthread/t-108076.html

Do a search for op amp stacking.

12th March 2009, 11:03 AM	#1
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Parallel Lm3886 Question When paralleling the LM3886 a small output resistor is used on each chip. Would the LM3886 be stable if feedback was taken after this output resistor instead of before it. If so couldn't we parralle all the pins of the chip except the output pin. It sure would keep the parts count down.

12th March 2009, 11:29 AM	#2
pacificblue diyAudio Member Join Date: May 2008	The ICs would have to be absolutely identical for that. If that were the case, there would be no need for load sharing resistors in the first place. The current state of production technology does not allow for such accuracy, so no, it would not work. __________________ If you've always done it like that, then it's probably wrong. (Henry Ford)

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12th March 2009, 11:40 AM	#3
jaudio diyAudio Member Join Date: Oct 2004	http://www.diyaudio.com/forums/showthread/t-108076.html Do a search for op amp stacking.

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