Service manual

System Overview 1-31
Description
A single 675 watt power supply provides power to the system. A second power
supply (optional) provides redundant power.
Power Supply Features
• 88–132 and 176–264 Vrms AC input
• 675 watts output. Output voltages are as follows:
Output Voltage Min. Voltage Max. Voltage Max. Current
+5.0 4.85 5.25 100
+3.3 3.18 3.48 100
+12 11.5 12.6 28
–12 –10.9 –13.2 2
+5 Vaux 4.9 5.4 1.5
• Remote sense on +5.0V and +3.3V
+5.0V is sensed on the system board.
+3.3V is sensed on the system board.
• Current share on +5.0V, +3.3V, and +12V.
• 3% regulation on +3.3V.
• Fault protection (latched). If a fault is detected by the power supply, it will shut
down. The power supply faults detected are:
Fan Failure (overtemp)
Overvoltage
Overcurrent
Power overload
• DC_ENABLE_L input signal starts the DC outputs.
• SHUTDOWN_H input signal shuts the power supply off in case of a system fan,
or CPU fan failure, or an overtemp condition detected by the power control logic.
• POK_H output signal indicates that the power supply is operating properly.