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Old 28th February 2006, 09:47 AM   #1
mobyd is offline mobyd  New Zealand
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Default CPU coolers for chipamps?

Given that the biggest problem with some of the more powerful chipamps (LM4780, TDA7293 etc) is getting a lot of heat away from a smallish object in a hurry, has anyone tried any of the commonly available CPU coolers typically used on Pentium class processors. Some of these boast impressive specs (0.3degC/W)
but I wonder what their bulk heat moving capacity is really like.
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Old 28th February 2006, 10:06 AM   #2
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Did you search before you posted? I think not!

There is lots of discussion on the use of CPU coolers for chip amps here.
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Old 28th February 2006, 10:38 AM   #3
Bazukaz is offline Bazukaz  Lithuania
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Cpu cooler is good , especially with a fan used. a fan can be set to low rotation speed to decrease noise.
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Old 28th February 2006, 11:18 AM   #4
Vikash is offline Vikash  United Kingdom
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Default Re: CPU coolers for chipamps?

Quote:
Originally posted by mobyd
Given that the biggest problem with some of the more powerful chipamps (LM4780, TDA7293 etc) is getting a lot of heat away from a smallish object in a hurry
Is it? I wouldn't say heatsink requirements are exceptional by any means. Many people use just large blocks of aluminium/copper or the case itself if it's of reasonable thickness.

As pinkmouse has said, you should find plenty of discussions on CPU coolers. IMO, certainly no need to add a fan into the mix.
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Old 28th February 2006, 01:44 PM   #5
Bazukaz is offline Bazukaz  Lithuania
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A fan dramatically increses power dissipation of the heatsink.For myself , i don't like fans for noise , but a thermo-relay could be used , so fan turns on only on high output levels.
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Old 28th February 2006, 01:54 PM   #6
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you can use an LM3524 (SG3524) as a temperature related PWM fan speed controller -- National has an application note on their website --
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Old 28th February 2006, 05:16 PM   #7
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i use a diminishingly small heatsink on my tda7294 amp(that small heatsink is called flower),the heat sink has small 12v dc brushless fan,the whole cooling setup only four or five times the size of ic..the setup keeps the ic cool....its small but very unsafe bec if the fan fails the chip will burn out in few sec bec the heat sink is too small to sustain the heat transfer even for few mins.

moreover the heatsinking req. of the chipamps is not that much critical to be met by using fans and it can be easily achieved by using big heatsinks.
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Old 28th February 2006, 05:18 PM   #8
Bazukaz is offline Bazukaz  Lithuania
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Most of modern ICs have thermal protection , don't know about TDAs , but LMs really do.
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Old 1st March 2006, 02:16 AM   #9
Leolabs is offline Leolabs  Malaysia
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The old TDAs do not have a good one,although in their datasheets,their stated that they have.
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Old 1st March 2006, 02:46 AM   #10
zenon is offline zenon  Canada
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DC fans can easily run at lower voltages then they are rated, for my PC I have two 12v fans wired in series so they run slower (6v across each) and the noise dropped from quite loud to inaudible. The noise all comes from the speed.. slow those fans down and they will be silent.
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