Heatsink for chip amps

[Anirvan]

Hey friends,
I'm once again here for my audio amplifier craze!

This time I have a query about the heatsink size for different types of chip amps like tda2030A, tda2050 etc..
I have a couple of Heatsinks with me but don't know which should be right one for these chips. So I want to know if I use two of tda2030A or tda2050 chips to build a stereo amp then what size would be correct ?

I have one 4 inches x 2 inches and one 12 inches x 2.5 inches but I know that obviously it would not require too big to fit into a metal cabinet. So please help me about the size.

Thanks in advance

 

[chermann]

Hi



For 2 chip amps i would use the big heat sink.
you can read about my estimation of heats ink at the LM1875 thread :
https://www.diyaudio.com/forums/chip-amps/341675-ebay-mono-lm1875-kit-3.html#post5893256
read this and you will get a better felling at experienced DiY



i use a 2,3K/W small heat sink:
%product-title% kaufen
this is good for lab test and music listening at normal level...if i push at the max in 8R this gets really hot. use a temp measurement tool that at all condition the chip do not get more then 70°C!! during normal listening 1Watt - 10W the heat sink it is luke warm.


chris



chris

 

[Panelhead]

If you can cut the sink, chop the big one and mount each channel to a separate one. The smaller one might work for one channel.
I have used smaller and had no issues. But normally do not listen loud or have demanding speakers.

 

[tomchr]

Pretty much everything you need to know: Taming the LM3886: Thermal Design – Neurochrome

Tom

 

[chermann]

thanks

 

[nigelwright7557]

You can work out heat sink size from power dissipated and how degrees/c the heatsink temp rises by. For class ab this is about 40% of power output by amp.
I would aim for 20 degree rise max.