Lm3886

MadFinn · 31st January 2006, 02:35 PM

What is the maximum voltage for this chip???
What output effect would this give
MadFinn

tiltedhalo · 31st January 2006, 03:01 PM

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).

sidehack · 31st January 2006, 03:06 PM

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.

Ole Pedersen · 31st January 2006, 03:13 PM

You can find the answers here:
http://www.national.com/pf/LM/LM3886.html

Regards
Ole

sivan_and · 31st January 2006, 03:23 PM

94 volt= Absolute maximum..

I_Forgot · 31st January 2006, 03:23 PM

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.

I_F

MadFinn · 31st January 2006, 07:35 PM

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????

Nordic · 31st January 2006, 07:42 PM

Roughly AC voltage times the square root of 2.

peranders · 31st January 2006, 07:47 PM

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.

I_Forgot · 1st February 2006, 12:07 AM

Two seconds on google yielded this:
http://my.integritynet.com.au/purdic/power1.html
and this:
http://sound.westhost.com/power-supp...y-requirements

I_F

31st January 2006, 02:35 PM	#1
MadFinn diyAudio Member Join Date: Jan 2006 Location: Småland	Lm3886 What is the maximum voltage for this chip??? What output effect would this give MadFinn

31st January 2006, 03:01 PM	#2
tiltedhalo diyAudio Member Join Date: Sep 2005 Location: Melbourne Florida	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).

31st January 2006, 03:23 PM	#5
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	94 volt= Absolute maximum.. __________________ SivanandBalan

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31st January 2006, 03:06 PM	#3
sidehack diyAudio Member Join Date: Jan 2006 Location: Missouri	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.

31st January 2006, 03:13 PM	#4
Ole Pedersen diyAudio Member Join Date: Jul 2004 Location: Copenhagen	You can find the answers here: http://www.national.com/pf/LM/LM3886.html Regards Ole

31st January 2006, 03:23 PM	#6
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	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. I_F

31st January 2006, 07:35 PM	#7
MadFinn diyAudio Member Join Date: Jan 2006 Location: Småland	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????

31st January 2006, 07:42 PM	#8
Nordic diyAudio Member Join Date: Sep 2005	Roughly AC voltage times the square root of 2.

1st February 2006, 12:07 AM	#10
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	Two seconds on google yielded this: http://my.integritynet.com.au/purdic/power1.html and this: http://sound.westhost.com/power-supp...y-requirements I_F

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