So one beginners question how to determine the heatsink size?
I am making a 2x2 lm3886TF amp so need to know what size of heatsink to use and if I use a fan (or 2) could I make the heatsink smaller and how much smaller?
I am making a 2x2 lm3886TF amp so need to know what size of heatsink to use and if I use a fan (or 2) could I make the heatsink smaller and how much smaller?
Novel Concepts, Inc. - Designs and Develops Heat Sinks, Heat Spreaders, Peltier Coolers, and Cold Plates
Take the calculated °C/W value, multiply by the amount of heat your chip is going to dissipate, add temperature of surrounding air, and you get temperature on the surface of chip (not inside)
Would be easier to just go for overkill though.
Take the calculated °C/W value, multiply by the amount of heat your chip is going to dissipate, add temperature of surrounding air, and you get temperature on the surface of chip (not inside)
Would be easier to just go for overkill though.
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go to the 3886 datasheet.
There is a table in there that does this for you. Just look up the values that suit your operational voltages and load resistance.
However, I recommend that you double the heatsink value that National specify using their method when using the T version of the chip.
I think the TF version will require an even bigger heatsink.
There is a table in there that does this for you. Just look up the values that suit your operational voltages and load resistance.
However, I recommend that you double the heatsink value that National specify using their method when using the T version of the chip.
I think the TF version will require an even bigger heatsink.
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