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Originally Posted by Cathar
Was referring to data that you know that I don't have the permission to publish......
Said data projected a unit thermal resistance lower than that of the inherent thermal spreading resistance of the copper in the unit.
Just wanted to make that point clear before leaving this.
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Cathar, not according to my analysis.
When R=C/W
where W=total heat dissipation through all of IHS
C= Local IHS Temp-Coolant Temp
which is the definition used for TTV testing in
July 2005 pdf
W distribution will depend on heater/heat-die dimensions and thermal characteristics and to a,probably, lesser extent the cooling properties of wb.
The case Post133 illustrated was a uniform flux 1x1cm die with 0.33x0.33mm Local area Temp(width of groove 0.33mm)
For 270,000w/m^2c on 14.4x14.4x1mm case
A tapered Flux Channel 14.4x14.4mm >0.33x0.33mm
Cu Resistance=Total Resistance- 1/h(eff)A =3.57949 -0.017861=3.561628775 c/w (
Waterloo
This resistance with reference to a 0.33x0.33mm area
Translated to 1sq cm ref area this is 0.003879 c/w
This a major part,but not all, of the total Resistivity of 0.003898c/w/cm^2
Edit Corrected pdf date to 2005