Doer
Well-Known Member
I am trying to understand heat sink needs for LED. But, some of them are sold per inch like at heatsinkusa.com and some are quoted by Watts, and some calculators I've found end up in cubic vol. some end up with total area including fins. Then I get number swim.
The concept is you don't want to exceed 90% of Junction Temp on the Spec.
That is balanced by how cool can you keep the heat sink. That is often given as distance per second of airflow.
Well, fans are measured in Cubic Feet per Minute.
To do this right I know you have to add up all the C per watt (C/W) including the thermal pad, Junction and Heat Sink, and then you get the answer. And you have to apply that answer to the airflow converted....swim...swim..
But, I how about the other way? I ask for your help.
This heat sink has the bottom plate room for several of the Cree CXA3590.
Rosewill RCX-Z200 92mm Ball CPU Cooler
by Rosewill
So, my question is the advisability of running 2 3950s (72vF) @ 100w each, on this heat sink?
I really don't think I am exceeding junction temp since it will be in a Cool tube type tunnel, and I will add a lot of exhaust CFM on one end and cool air on the other.
Thoughts?
The concept is you don't want to exceed 90% of Junction Temp on the Spec.
That is balanced by how cool can you keep the heat sink. That is often given as distance per second of airflow.
Well, fans are measured in Cubic Feet per Minute.
To do this right I know you have to add up all the C per watt (C/W) including the thermal pad, Junction and Heat Sink, and then you get the answer. And you have to apply that answer to the airflow converted....swim...swim..
But, I how about the other way? I ask for your help.
This heat sink has the bottom plate room for several of the Cree CXA3590.
Rosewill RCX-Z200 92mm Ball CPU Cooler
by Rosewill
So, my question is the advisability of running 2 3950s (72vF) @ 100w each, on this heat sink?
I really don't think I am exceeding junction temp since it will be in a Cool tube type tunnel, and I will add a lot of exhaust CFM on one end and cool air on the other.
Thoughts?