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EPS2U Power Supply Design Guide, V2.1
4.1 Airflow Requirements
STATUS
Recommended
The power supply shall have a two-speed fan(s) and provide cooling to both the supply and the system. During
low-speed fan operation, the power supply must not exceed a noise level of 43 dBa measured at one meter on all
faces. At low fan speed, the power supply shall provide a minimum of 12 CFM of airflow with 0.003 inH
2O of
system backpressure. At high fan speed, the power supply shall provide a minimum of 20 CFM with 0.006 inH2O
of system backpressure.
4.2 Temperature Requirements
STATUS
Recommended
The power supply shall operate within all specified limits over the T
op
temperature range. The average air
temperature difference (∆T
ps
) from the inlet to the outlet of the power supply shall not exceed the values shown
below in Table 1. All airflow shall pass through the power supply and not over the exterior surfaces of the power
supply.
Table 1: Thermal Requirements
ITEM DESCRIPTION MIN MAX UNITS
T
op
Operating temperature range. 0 50
°C
T
non-op
Non-operating temperature range. -40 70
°C
The power supply must meet UL enclosure requirements for temperature rise limits. All sides of the power supply
with exception of the air exhaust side, must be classified as “Handle, knobs, grips, etc. held for short periods of
time only”.
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