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LM3886 output impedance
LM3886 output impedance
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Old 10th June 2005, 07:20 AM   #1
alexw88 is offline alexw88  Hong Kong
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Default LM3886 output impedance

Does anyone know what the output impedance of the LM3886 is?
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Old 10th June 2005, 08:27 AM   #2
peranders is offline peranders  Sweden
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LM3886 output impedance
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.
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Old 11th June 2005, 02:58 AM   #3
Leolabs is offline Leolabs  Malaysia
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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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