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Old 9th August 2011, 11:36 AM   #1
jazko is offline jazko  United Kingdom
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Default LM4780 - insulation required?

I was wondering if there is a need to insulate my single LM4780 chip from the heatsink? I'll be using one chip for 2 channels. It's always good to ask first, I guess ?

P.S
I forgot to mention, that the heatsink will be mounted in a wooden box, so there will be no exposed metal parts. Where shoud I connect the earth wire then?

Last edited by jazko; 9th August 2011 at 11:58 AM.
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Old 9th August 2011, 02:52 PM   #2
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The heatsink pad of Lm4780 is connected to -Vcc
So never connect the heatsink to ground.

And in your case since you are using wooden case, no need to insulate the chip.
Infact i am also using a similar setup without any problem :-)
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Last edited by kuldeepsingh; 9th August 2011 at 02:57 PM.
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Old 9th August 2011, 05:09 PM   #3
AndrewT is offline AndrewT  Scotland
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Mains powered equipment located inside an insulated box that has no earth connection is effectively ClassII equipment.
Don't try to build ClassII equipment unless you have been trained to design, been trained to build it, been trained to devise tests for it, been trained to test it, been made aware of the warranty you as the designer, builder and tester must give to ensure the safety of anyone coming into contact with that ClassII equipment.

The Forum does not ban the discussion of ClassII equipment but I have never seen a recommendation to do so that has not attracted some kind of Safety Warning.

The Forum does ban all discussion of direct to mains equipment.

That foregoing message does not seem to put off the overly ambitious DIYers who due to their ignorance do not realise the dangers they are introducing by attempting to build insulated ClassI equipment that can never reach the ClassII standards.
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Last edited by AndrewT; 9th August 2011 at 05:12 PM.
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