User`s manual

54 AWS-8259 User's Manual
3. Protections:
3.1 Over Voltage Protection:
Table B-4: Over voltage protection
3.2 Short Circuit Protection:
The power supply shall shut down and latch off for shorting +5V, +12V,
-12V, -5V or +3.3V rails to COM and shorting +5Vsb, P/S can latch
down or automatically recovery when the fault condition is removed.
3.3 No Load Operation: No damage or hazardous condition
will occur.
3.4 Cooling and Acoustics:
The power supply shall contain a thermal sensing circuit capable of
varying fan speed. The power supply shall have at T =25 and +5V@1A,
+3.3V@3A, +12V@1A load:
1.) A min. voltage of 6.0V ± 0.5V.
2.) A max. noise level of 30dBA between 0 and 4KHz measured 39.4
inches from the intake side of the fan in free air.
The power supply shall have at T =50°C and max. rated load:
1.) A min.voltage of 12V ± 0.5V.
2.) A max. noise level of 45dBA between 0 and 4KHz measured 39.4
inches from the intake side of the fan in free air.
The fan shall be a Ball Bearing DC brushless tubeaxial fan rated to
operate between a range of 6 to 12V.
P.V.O timiL.P.V.O
V3.3+V5.4
V5+V7
V21+V6.51