Compaq AlphaServer DS20 Service Manual page 41

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
+5.0
+3.3
+12 11.5
–12 –10.9
+5 Vaux 4.9
•
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.
Max. Voltage
4.85 5.25
3.18 3.48
12.6
–13.2
5.4
Max. Current
100
100
28
2
1.5
System Overview 1-31