Intel 315889-002 manual 8Environmental Conditions, 8.1Operating Temperature - PROPOSED

Environmental Conditions

8Environmental Conditions

The VRM/EVRD design, including materials, should meet the environmental requirements specified below.

8.1Operating Temperature - PROPOSED

The VRM/EVRD shall meet all electrical requirements when operated at the Thermal Design Current (IccTDC) 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:

•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 inlet as:

•v = Q/(0.3 x 0.15)m2 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.

8.2VRM 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.

8.3Non-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.

8.4Humidity - PROPOSED

85% relative – operating

95% relative – non-operating

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