Sff/Cmt Power Distribution - HP Compaq dc7900 USDT Technical Reference Manual

Power and Signal Distribution
Table 7-1 lists the specifications of the external supply.
USDT 135-Watt Power Supply Unit Specifications
Parameter
Input Line Voltage Range
Line Frequency
Input Current, Maximum load @ 90 VAC
Output Voltage
Output Current, nominal load
Output Current, maximum load
Output Current, peak load (300 ms max) [1]
NOTES:
Total continuous power should not exceed 135 watts. Total surge power (<10 seconds w/duty cycle < 5 %) should not exceed
170 watts.
[1] Using 100 VAC input. The output voltage is allowed to drop to a minimum of 15 VDC during the transient period.

7.2.2 SFF/CMT Power Distribution

The SFF and CMT form factors use a power supply unit contained within the system chassis.
Figure 7-2 shows the block diagram for power generation in the SFF and CMT.
Front Bezel
Power Button
Power On
90 - 264 VAC
NOTE:
[1] Not present on CMT.
Figure 7-2. SFF Power Generation, Block Diagram
Table 7-2 lists the specifications of the SFF power supply unit.
7-2
Table 7-1.
System Board
CPU, slots, Chipsets, Logic,
& Voltage Regulators
+3.3 VDC 5 AUX
Fan
PS On
Spd [1]
Power Supply
www.hp.com
90–265 VAC
47–63 Hz
2.4 A
19.5 VDC
3.5 A
6.9 A
9.0 A
+5 VDC +12 VDC +12 VccP
Unit
-12 VDC
+3.3 VDC
+5 VDC
Drives
+12 VDC
Technical Reference Guide