HP dc7800 manual SFF Power Distribution, Usdt 135-Watt Power Supply Unit Specifications

Power and Signal Distribution

Table 7-1 lists the specifications of the external supply.

Table 7-1.

USDT 135-Watt Power Supply Unit Specifications

Parameter
Input Line Voltage Range	90–265 VAC
Line Frequency	47–63 Hz
Input Current, Maximum load @ 90 VAC	2.2 A
Output Voltage	19.0 VDC
Output Current, nominal load	3.0 A
Output Current, maximum load	7.1 A
Output Current, peak load (300 ms max) [1]	9.0 A

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.

7.2.2SFF Power Distribution

The SFF form factor uses a power supply unit internal to the system chassis. Figure 7-2 shows the block diagram for power generation in the SFF.

Front Bezel System Board

Power Button

Power On

90 - 264 VAC

NOTE:

CPU, slots, Chipsets, Logic, & Voltage Regulators

		+3.3 VDC	5 AUX	+5 VDC	+12 VDC	+12 VccP	-12 VDC
								+3.3 VDC
PS On	Fan							+5 VDC
	Spd [1]							+12 VDC

Power Supply

Unit

Drives

[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 www.hp.com Technical Reference Guide