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Old 5th October 2003, 01:25 PM   #1
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Default Lm1875

I don't know too much about heatsinks, other than they take heat off of chips. Is the small heatsink below sufficient for the LM1875?
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Old 5th October 2003, 01:31 PM   #2
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No, far from that. Use a proper heatsink that is able to keep the chip at a normal temperature at full load.
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Old 5th October 2003, 01:37 PM   #3
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How about this?
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Old 5th October 2003, 03:18 PM   #4
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Still too small.
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Old 5th October 2003, 03:31 PM   #5
Netlist is offline Netlist  Belgium
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Default Re: Lm1875

Quote:
Originally posted by soundNERD
I don't know too much about heatsinks
Here's the datasheet for the LM1875.
http://www.national.com/ds/LM/LM1875.pdf
There's a lot of good info in it regarding heatsinks.
Search this forum as well. There are many threads talking about calculating them.
This is one example: http://www.diyaudio.com/forums/showt...ht=#post101358

/Hugo
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Old 6th October 2003, 02:27 AM   #6
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I have the datasheet, but all the equations and info about heatsinks make no sense to me. Can anybody explain to me some basic things about them?

My project is a surround sound computer speaker system.

Thanks, Mike
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Old 7th October 2003, 05:44 AM   #7
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just get 1 about the size of a couple of decks of playing cards
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Old 7th October 2003, 12:39 PM   #8
JCoffey is offline JCoffey  United States
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Or a heatsink from a PentiumII processor. My LM7886 integrated once I took it apart has a heatsink that size that both chips are attached to. I was kinda shocked, but it's never gotten too hot, so the LM1875's shouldnt need any more than that. I have access to quite a few of them here at work, since we're pulling all of our old PII pcs.
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Old 7th October 2003, 02:55 PM   #9
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Quote:
Originally posted by autoexec
just get 1 about the size of a couple of decks of playing cards
That's better.
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Old 8th October 2003, 01:21 AM   #10
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so, this is a little overkill, right? i mean, it can keep a 3886 cool... or am i wrong. If you cant read the ruler, it is 4 and 1/8 inch wide, about 2.5 inches deep and a little over 3/4 inch tall.
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