Table 59. Capacitive Loading Conditions - Intel P4000IP Series Technical Product Specification

Intel® Server System P4000IP and Intel® Workstation System P4000CR Family TPS
+12VSB
+12V
Note: For dynamic condition +12V min loading is 1A.
2.3.4.5 Capacitive Loading
The power supply shall be stable and meet all requirements with the following capacitive
loading ranges.
2.3.4.6 Grounding
The output ground of the pins of the power supply provides the output power return path. The
output connector ground pins shall be connected to the safety ground (power supply enclosure).
This grounding should be well designed to ensure passing the max allowed Common Mode
Noise levels.
The power supply shall be provided with a reliable protective earth ground. All secondary
circuits shall be connected to protective earth ground. Resistance of the ground returns to
chassis shall not exceed 1.0 m. This path may be used to carry DC current.
2.3.4.7 Residual Voltage Immunity in Standby mode
The power supply should be immune to any residual voltage placed on its outputs (Typically a
leakage voltage through the system from standby output) up to 500mV. There shall be no
additional heat generated, nor stressing of any internal components with this voltage applied to
any individual or all outputs simultaneously. It also should not trip the protection circuits during
turn on.
The residual voltage at the power supply outputs for no load condition shall not exceed 100mV
when AC voltage is applied and the PSON# signal is de-asserted.
2.3.4.8 Common Mode Noise
The Common Mode noise on any output shall not exceed 350mV pk-pk over the frequency
band of 10Hz to 20MHz.
1. The measurement shall be made across a 100Ω resistor between each of DC outputs,
including ground at the DC power connector and chassis ground (power subsystem
enclosure).
2. The test set-up shall use a FET probe such as Tektronix model P6046 or equivalent.
2.3.4.9 Hot Swap Requirements
Hot swapping a power supply is the process of inserting and extracting a power supply from an
operating power system. During this process the output voltages shall remain within the limits
with the capacitive load specified. The hot swap test must be conducted when the system is
operating under static, dynamic, and zero loading conditions. The power supply shall use a
56
(See note 2)
1.0A
60% of max load

Table 59. Capacitive Loading Conditions

Output MIN
+12VSB 20
+12V 500
Intel order number G38159-001
0.25 A/sec
0.25 A/sec
MAX Units
F
3100
F
25000
System Power Sub-system
20 F
2000 F
Revision 1.0