LM3886 output impedance

alexw88 · 10th June 2005, 07:20 AM

Does anyone know what the output impedance of the LM3886 is?

peranders · 10th June 2005, 08:27 AM

The datasheet doesn't tell this but it is hinted that it is 0.45 ohms plus the output transistor, so it will never go under 0.45 ohms in open-loop but when you apply feedback you will get this:

100 Hz 0.15 mohms
1 kHz 1.5 mohms
10 kHz 15 milliohms

Notice this is in theory but I think we can conclude this with saying : pretty low and nothing to worry about.

Notice also that in many cases you will need some sort of output filter which add at least a couple of millihohms. My filter has 5 mohms.

Leolabs · 11th June 2005, 02:58 AM

Need not worry much about the output impedance of LM3886,i havent heard any complaint about this

.Think that it is able to drive a not quite difficult load.

10th June 2005, 07:20 AM	#1
alexw88 diyAudio Member Join Date: Mar 2004 Location: HK	LM3886 output impedance Does anyone know what the output impedance of the LM3886 is? __________________ My Audio Page

10th June 2005, 08:27 AM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	The datasheet doesn't tell this but it is hinted that it is 0.45 ohms plus the output transistor, so it will never go under 0.45 ohms in open-loop but when you apply feedback you will get this: 100 Hz 0.15 mohms 1 kHz 1.5 mohms 10 kHz 15 milliohms Notice this is in theory but I think we can conclude this with saying : pretty low and nothing to worry about. Notice also that in many cases you will need some sort of output filter which add at least a couple of millihohms. My filter has 5 mohms. __________________ /Per-Anders (my first name) or P-A as my friends call me

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11th June 2005, 02:58 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Need not worry much about the output impedance of LM3886,i havent heard any complaint about this .Think that it is able to drive a not quite difficult load.

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