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Balanced Technology Extended (BTX) Thermal/Mechanical Design Information
Table 5–4, then the Thermal Module should be re-designed to have a preload that lies
within the range given in Table 5–4, allowing for preload tolerances.
Table 5–4. Processor Preload Limits
Parameter
Processor Preload
NOTES:
1.
Figure 5-6. Minimum Required Processor Preload to Thermal Module Assembly Stiffness
NOTES:
1.
2.
3.
Thermal and Mechanical Design Guidelines
Minimum Required
These values represent upper and lower bounds for the processor preload. The nominal
preload design point for the Thermal Module is based on a combination of requirements
of the TIM, ease of assembly and the Thermal Module effective stiffness.
The shaded region shown is the acceptable domain for Thermal Module assembly
effective stiffness and processor preload combinations. The Thermal Module design
should have a design preload and stiffness that lies within this region. The design
tolerance for the preload and TMA stiffness should also reside within this boundary.
Note that the lower and upper horizontal boundaries represent the preload limits
provided in Table 5–4. The equation for the left hand boundary is described in note 2.
The equation for this section of the preload-Thermal Module stiffness boundary is given
by the following relationship: Min Preload = 1.38E-3*k^2 – 1.18486k + 320.24753 for
k < 300 N/mm where k is the Thermal Module assembly effective stiffness. Note that
this equation is only valid in the stiffness domain of 93N/mm < k < 282N/mm. This
equation would not apply, for example, for TMA stiffness less than 93N/mm,
The target stiffness for the 65W Type II TMA reference design is 484 N/mm
(2764 lb / in).
98 N [22 lbf]
Maximum
Notes
Allowed
222 N [50 lbf]
1
51
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