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Old 31st January 2006, 02:35 PM   #1
MadFinn is offline MadFinn  Sweden
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Default Lm3886

What is the maximum voltage for this chip???
What output effect would this give
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Old 31st January 2006, 03:01 PM   #2
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Default lm3886 supply voltage

LM3886 Supply Max 84VDC or +/- 42VDC
68W into 4ohms at Vcc=+/- 28V
38W into 8ohms at Vcc=+/- 28V
50W into 8ohms at Vcc=+/- 35V
over 35V+/- thermal and spik protection become an issue due to package dissipation(125W max).
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Old 31st January 2006, 03:06 PM   #3
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The data sheet says supply range from 20 to 94 volt, so ±10v to ±47v.

Also according to the data sheet, ±10v gives very little output power (~5W), where ±47 is off the chart.



Well, it says 94V on the front page... 84V as the limit everywhere else in the sheet.
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Old 31st January 2006, 03:13 PM   #4
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You can find the answers here:
http://www.national.com/pf/LM/LM3886.html

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Ole
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Old 31st January 2006, 03:23 PM   #5
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94 volt= Absolute maximum..
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Old 31st January 2006, 03:23 PM   #6
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The absolute maximum rating for an LM3886 with an input signal is 84V. You can find this info on page 3. Most amps aren't very useful without an input signal...

Absolute maximum ratings are just that. If you exceed these values you will probably fry the part (and maybe your speakers, too).

Also check note 2 at the bottom of page 4.

Now we will hear from a half dozen guys who run the power supplies at 100V with no problems... yet.

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Old 31st January 2006, 07:35 PM   #7
MadFinn is offline MadFinn  Sweden
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Ok thanx for your answers
Now to next question in this subject:
If i want sat about +- 40-45 volts What voltage does the transormer have then I have understod that +-30 volts gives a hagher voltage after the diods right ???
what i the formula to calculate this????
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Old 31st January 2006, 07:42 PM   #8
Nordic is offline Nordic  South Africa
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Roughly AC voltage times the square root of 2.
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Old 31st January 2006, 07:47 PM   #9
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Quote:
Originally posted by MadFinn
Ok thanx for your answers
Now to next question in this subject:
If i want sat about +- 40-45 volts What voltage does the transormer have then I have understod that +-30 volts gives a hagher voltage after the diods right ???
what i the formula to calculate this????
2 x 28 VAC is max ( www.ELFA.se has such transformer) and 2 x 24 VAC will give you no worries what so ever. A rough estimation is AC times 1.4.
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Old 1st February 2006, 12:07 AM   #10
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Two seconds on google yielded this:
http://my.integritynet.com.au/purdic/power1.html
and this:
http://sound.westhost.com/power-supp...y-requirements

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