HP dc7900 Table, SFF 240-WattPower Supply Unit Specifications

Power and Signal Distribution

Table 7-2.

SFF 240-Watt Power Supply Unit Specifications

		Min.
	Range/	Current		Max.		Surge		Max.
	Tolerance	Loading [1]		Current		Current		Ripple
Input Line Voltage	90–264 VAC	--		--		--		--
Line Frequency	47–63 Hz	--		--		--		--
Input (AC) Current	--	--		5.0	A	--		--
+3.3 VDC Output	+ 4%	0.1	A	15.0 A		15.0 A		50 mV
+5.08 VDC Output	+ 3.3 %	0.3 A		17.0 A		17.0 A		50 mV
+5.08 AUX Output	+ 3.3 %	0.0 A		3.0	A	3.5	A	50 mV
+12 VDC Output	+ 5 %	0.1	A	7.5	A	9.0	A	120 mV
+12 VDC Output (Vcpu)	+ 5 %	0.1	A	11.0 A		14.5 A		120 mv
--12 VDC Output	+ 10 %	0.0 A		0.15 A		0.15 A		200 mV

NOTES:

Total continuous power should not exceed 240 watts. Total surge power (<10 seconds w/duty cycle < 5 %) should not exceed 260 watts.

[1] The minimum current loading figures apply to a PS On start up only.

Figure 7-3 shows the power supply cabling for the SFF system.

P4

P7

P5

P2

P4, P5, P7

P2

3

P3

4

P11

1

2

P3

P11

5 4 3 2 1

3

4

3

2

1

1

2

13

P1

4

24

Power Supply

P1

Unit

1

12

Pin

Pin

Pin

Conn

Pin 1

Pin 2

Pin 3

Pin 4

Pin 5

Pin 6

Pin 7

Pin 8

Pin 9

10

11

12

P1

+3.3

+3.3

RTN

+5

RTN

+5

RTN

POK

5AUX

+12

+12

3.3

P1 [1]

+3.3

-12

RTN

PS On

RTN

RTN

RTN

PS Det

+5

+5

+5

RTN

P2

+5

RTN

RTN

+12

P3

RTN

RTN

VccP

VccP

P4, 5,

+3.3

RTN

+5

RTN

+12

7

P11

GND

nc

Ftach

Fcmd

All + and - values are VDC. RTN = Return (signal ground) sns = sense

GND = Power ground RS = Remote sense FC = Fan command FO = Fan off

FSpd = Fan speed FS = Fan Sink

POK = Power OK (power good)

VccP = +12 for CPU nc = not connected Ftach = Fan speed Fcmd = Fan command

[1] This row represents pins 13–24 of connector P1

Figure 7-3. SFF Power Cable Diagram

Technical Reference Guide www.hp.com 7-3