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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
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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
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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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