HP Compaq dc7800 Series Technical Reference Manual page 83

Input Line Voltage
Line Frequency
Input (AC) Current
+3.3 VDC Output
+5.08 VDC Output
+5.08 AUX Output
+12 VDC Output
+12 VDC Output (Vcpu)
-- 1 2 VDC Output
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.
Power Supply
Unit
Conn Pin 1
P1 +5
aux
P1 [1] +12
P2 +5
P3 RTN
P4, 5, +3.3
7
Connectors not shown to scale.
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
[1] This row represents pins 13–24 of connector P1
Figure 7-3. SFF Power Cable Diagram
Technical Reference Guide
SFF 240-Watt Power Supply Unit Specifications
Range/
Tolerance
90–264 VAC
47–63 Hz
--
+ 4%
+ 3.3 %
+ 3.3 %
+ 5 %
+ 5 %
+ 10 %
P5
P7
P4
Pin 2 Pin 3 Pin 4 Pin 5
RTN + 5 +5 PS On
+5 sns RTN +5 +5
RTN RTN +12
RTN RTN VccP VccP
RTN +5 RTN +12
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Table 7-2.
Min.
Current Max.
Loading [1] Current
-- --
-- --
-- 5.0 A
0.1 A 15.0 A
0.3 A 17.0 A
0.0 A 3.0 A
0.1 A 7.5 A
0.1 A 1 1.0 A
0.0 A 0.15 A
P2
P4, P5, P7
P3
5 4 3 2 1
13
P1
1
Pin 6 Pin 7 Pin 8
RTN Pwr Gd +3.3
+3.3 RTN +3.3 sns
+12
Power and Signal Distribution
Surge Max.
Current [2] Ripple
-- --
-- --
-- --
15.0 A 50 mV
17.0 A 50 mV
3.5 A 50 mV
9.0 A 120 mV
14.5 A 120 mv
0.15 A 200 mV
P2
4
P3
4
3 2 1
1
P1
24
12
Pin Pin
Pin 9 10 1 1
+3.3 Tach RTN
+3.3 +3.3 RTN
6
3
Pin
12
Fan
- 1 2
7-3