SFX12V Specific Guidelines 4.0
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Figure 14-9: Chassis Cutout
14.9 PS3 Form Factor-Physical Dimensions -
REQUIRED
The power supply shall be enclosed and meet the physical outline shown in Figure
14-10.
14.10 Fan Requirements - REQUIRED
An 80 mm axial fan is typically needed to provide enough cooling airflow through a
high performance Micro ATX system. Exact CFM requirements vary by application and
endues environment, but 25-35 CFM is typical for the fan itself.
For consumer or other noise-sensitive applications, it is recommended that a
thermally sensitive fan speed control circuit be used to balance system-level thermal
and acoustic performance. The circuit typically senses the temperature of an internal
heatsink and/or incoming ambient air and adjusts the fan speed as necessary to keep
power supply and system component temperatures within specification. Both the
power supply and system designers should be aware of the dependencies of the power
supply and system temperatures on the control circuit response curve and fan size
and should specify them very carefully.
The power supply fan shall be turned off when PS_ON# is de-asserted (high). In this
state, any remaining active power supply circuitry must rely only on passive
convection for cooling.
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