What's a normal temp for LM3886 on 40+40 DC? - diyAudio
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Old 22nd January 2008, 02:52 AM   #1
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Default What's a normal temp for LM3886 on 40+40 DC?

Hi, I was wondering what thermals I should expect from LM3886 on voltage like 40+40 DC?

Howabout when running 4 ohm speakers at full tilt?

What temperatures would you expect?
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Old 22nd January 2008, 02:55 AM   #2
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Should NOT run this chip at 40 volt rails into 4 ohm load. Might get away with 8 ohms.
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Old 22nd January 2008, 03:35 AM   #3
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Have you tried that? If so, what was your experience with the heatsink requirements?
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Old 22nd January 2008, 03:44 AM   #4
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Hi,
If you have MS Excel, you can work with the design spreadsheet here:http://www.national.com/appinfo/audi...gn_Guide15.xls

The recommended power supply for 8 ohms is +/-35 volts. To go with higher rail voltage could trigger the SPIKE protection.
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Old 22nd January 2008, 07:51 AM   #5
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Thank you!!!
The last copy of that spreadsheet that I had didn't work.
Yours worked like a charm.
It also answered my NFB puzzle on how to get some serious headroom without going off spec.
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