Intel 315889-002 用户手册
315889-002
45
Environmental Conditions
8
Environmental Conditions
The VRM/EVRD design, including materials, should meet the environmental
requirements specified below.
requirements specified below.
8.1
Operating Temperature - PROPOSED
The VRM/EVRD shall meet all electrical requirements when operated at the Thermal
Design Current (Icc
Design Current (Icc
TDC
) over an ambient temperature range of 0ºC to +45ºC with a
minimum airflow of 400 LFM (2 m/s). The volumetric airflow (Q) can be measured
through a wind tunnel. For testing, the baseboard should be mounted in a duct. (A VRM
should be mounted on a PCB, and then mounted in a duct.) The recommended duct
cross-section, assuming the PCB is horizontal and flush with the bottom of the duct, is
as follows:
through a wind tunnel. For testing, the baseboard should be mounted in a duct. (A VRM
should be mounted on a PCB, and then mounted in a duct.) The recommended duct
cross-section, assuming the PCB is horizontal and flush with the bottom of the duct, is
as follows:
• Y direction duct width (perpendicular to flow, horizontal) = 0.3 m
• Z direction duct height (perpendicular to flow, vertical) = 0.15 m
• Minimum X direction duct length in front of VRM = 6 hydraulic diameters = 1.2 m
• Minimum X direction duct length behind VRM = 2 hydraulic diameters = 0.4 m
• Velocity (v) is calculated from the volumetric flow and cross-sectional area at the
• Z direction duct height (perpendicular to flow, vertical) = 0.15 m
• Minimum X direction duct length in front of VRM = 6 hydraulic diameters = 1.2 m
• Minimum X direction duct length behind VRM = 2 hydraulic diameters = 0.4 m
• Velocity (v) is calculated from the volumetric flow and cross-sectional area at the
inlet as:
• v = Q/(0.3 x 0.15)m
2
Operating conditions shall be considered to include 10 cycles
between min and max temperature at a rate of 10ºC/hour and a dwell time of 30
minutes at extremes. Temperature and airflow measurements should be made in
close proximity to the VRM.
minutes at extremes. Temperature and airflow measurements should be made in
close proximity to the VRM.
8.2
VRM Board Temperature - REQUIRED
To maintain the connector within its operating temperature range, the VRM board
temperature, at the connector interface, shall not exceed a temperature equal to 90ºC.
At no time during the operation is the board permitted to exceed 90ºC within a distance
of 2.54 mm [0.100”] from the top of connector (0.4 in. from board edge). In order not
to exceed 90ºC, it is recommended that the board be constructed from 2-ounce copper
cladding. Temperature and airflow measurements should be made in close proximity to
the VRM.
temperature, at the connector interface, shall not exceed a temperature equal to 90ºC.
At no time during the operation is the board permitted to exceed 90ºC within a distance
of 2.54 mm [0.100”] from the top of connector (0.4 in. from board edge). In order not
to exceed 90ºC, it is recommended that the board be constructed from 2-ounce copper
cladding. Temperature and airflow measurements should be made in close proximity to
the VRM.
8.3
Non-Operating Temperature - PROPOSED
The VRM/EVRD shall not be damaged when exposed to temperatures between –40ºC
and +70ºC. These shall be considered to include 50 cycles of minimum to maximum
temperatures at 20ºC/hour with a dwell time of 20 minutes at the extremes.
and +70ºC. These shall be considered to include 50 cycles of minimum to maximum
temperatures at 20ºC/hour with a dwell time of 20 minutes at the extremes.
8.4
Humidity - PROPOSED
85% relative – operating
95% relative – non-operating