SFX12V Specific Guidelines 3.43
Design Guide 57
Figure 13-9: Chassis Cutout
13.9 PS3 Form Factor- Physical Dimensions - Required
The power supply shall be enclosed and meet the physical outline shown in
Figure 13-10
.
13.10 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 fanshall 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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