Thermal Solutions
36
Intel® Xeon® Processor E5-2400 Product Family
Thermal/Mechanical Design Guide
5.2.1
Thermal Interface Material (TIM)
TIM should be verified to be within its recommended shelf life before use.
Surfaces should be free of foreign materials prior to application of TIM.
Use isopropyl alcohol and a lint free cloth to remove old TIM before applying new TIM.
5.3
Structural Considerations
Target mass of heatsinks should not exceed 500 gm.
, the Dynamic Compressive Load of 200 lbf max allows for designs that
exceed 500 gm as long as the mathematical product does not exceed 200 lbf. Example:
A heatsink of 2-lb mass (908 gm) x 50 g (acceleration) x 2.0 Dynamic Amplification
Factor = 200 lbf. The Total Static Compressive Load (
) should also be
considered in dynamic assessments.
Direct contact between back plate and chassis pan will help minimize board deflection
during shock. Placement of board-to-chassis mounting holes also impacts board
deflection and resultant socket solder ball stress. Customers need to assess shock for
their designs as their heatsink retention (back plate), heatsink mass and chassis
mounting holes may vary.
5.4
Thermal Design
5.4.1
Thermal Characterization Parameter
The case-to-local ambient Thermal Characterization Parameter (
Ψ
CA
) is defined by:
Equation 5-1.
Ψ
CA
= (T
CASE
- T
LA
) / TDP
Where:
T
CASE
=
Processor case temperature (°C). For
T
CASE
specification see the
appropriate External Design Specification (EDS).
T
LA
=
Local ambient temperature in chassis at processor (°C).
TDP
=
TDP (W) assumes all power dissipates through the integrated heat
spreader. This inexact assumption is convenient for heatsink design.
TTVs are often used to dissipate TDP. Correction offsets account for
differences in temperature distribution between processor and TTV.
Equation 5-2.
Ψ
CA
=
Ψ
CS
+
Ψ
SA
Where:
Ψ
CS
=
Thermal characterization parameter of the TIM (°C/W) is dependent
on the thermal conductivity and thickness of the TIM.
Ψ
SA
=
Thermal characterization parameter from heatsink-to-local ambient
(°C/W) is dependent on the thermal conductivity and geometry of the
heatsink and dependent on the air velocity through the heatsink fins.
illustrates the thermal characterization parameters.
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