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Chip Amps Amplifiers based on integrated circuits

Is LM3875 Enclosure Venting Required?
Is LM3875 Enclosure Venting Required?
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Old 25th March 2005, 01:16 AM   #1
ransom peek is offline ransom peek  United States
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Default Is LM3875 Enclosure Venting Required?

Am building Brian GT lm3875 rev 3 in a small wood enclosure. 330 VA Avel toroid, and a substancial, shared, finned heat sink 7" x 1 1/2" x 1 1/8".

I'm not planning on any sort of venting (it is unsightly in a cherry enclosure) but could put holes in bottom, sight unseen.

Anyone have experience with this chipamp - will it generate too much heat that needs to be dissipated with ventilation? From reading the postings, my selected heat sink ought to do a fine job given a reasonable ambient temperature, but... the issue is where does the heat in the enclosure go?
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Old 25th March 2005, 01:46 AM   #2
mhb is offline mhb  United States
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Default Re: no vent

Ransom:

You'll be fine if the heatsink is mounted externally. If the heatsink is enclosed, all bets are off.

cheers,

m
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Old 25th March 2005, 03:30 AM   #3
ransom peek is offline ransom peek  United States
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Default Venting for toroid?

OK, small wood enclosure, no venting, heatsink exposed to outside.

How about that big old 330va Avex toroid poer tranny - does it need venting? Does it get hot?
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Old 25th March 2005, 03:46 AM   #4
sivan_and is offline sivan_and  India
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Some vents on the bottom plate/chassis toward the front end and some vents on the back...will create an airflow towards the back from the front side...
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