LGA775 Socket Heatsink Loading
Thermal and Mechanical Design Guidelines
73
Figure 7-7. Example—Defining Heatsink Preload Meeting Board Deflection Limit
A.3.4
Additional Considerations
Intel recommends to design to {d_BOL - d_ref = 0.15 mm} at BOL when EOL
conditions are not known or difficult to assess
The following information is given for illustration only. It is based on the reference
keep-out, assuming there is no fixture that changes board stiffness:
d_ref is expected to be 0.18 mm on average, and be as high as 0.22 mm
As a result, the board should be able to deflect 0.37 mm minimum at BOL
Additional deflection as high as 0.09 mm may be necessary to account for additional
creep effects impacting the board/clip/fastener assembly. As a result, designs could
see as much as 0.50 mm total downward board deflection under the socket.
In addition to board deflection, other elements need to be considered to define the
space needed for the downward board total displacement under load, like the potential
interference of through-hole mount component pin tails of the board with a
mechanical fixture on the back of the board.
NOTES:
1.
The heatsink preload must remain below the maximum load limit of the package at all
times (Refer to processor datasheet).
2.
Board deflection should not exceed motherboard manufacturer specifications.
Содержание CELERON PROCESSOR E3000 - THERMAL AND MECHANICAL DESIGN
Страница 24: ...Processor Thermal Mechanical Information 24 Thermal and Mechanical Design Guidelines ...
Страница 80: ...Heatsink Clip Load Metrology 80 Thermal and Mechanical Design Guidelines ...
Страница 82: ...Thermal Interface Management 82 Thermal and Mechanical Design Guidelines ...
Страница 106: ...Balanced Technology Extended BTX System Thermal Considerations 106 Thermal and Mechanical Design Guidelines ...
Страница 108: ...Fan Performance for Reference Design 108 Thermal and Mechanical Design Guidelines ...
Страница 120: ...Mechanical Drawings 120 Thermal and Mechanical Design Guidelines Figure 7 50 Reference Fastener Sheet 1 ...
Страница 121: ...Mechanical Drawings Thermal and Mechanical Design Guidelines 121 Figure 7 51 Reference Fastener Sheet 2 ...
Страница 122: ...Mechanical Drawings 122 Thermal and Mechanical Design Guidelines Figure 7 52 Reference Fastener Sheet 3 ...
Страница 123: ...Mechanical Drawings Thermal and Mechanical Design Guidelines 123 Figure 7 53 Reference Fastener Sheet 4 ...
