Technical Product Specification

System Power Sub-system Intel® Server System P4000IP and Intel® Workstation System P4000CR Family TPS
Revision 1.2 Intel order number G38159-002
43
Table 37. Transient Load Requirements
Output
 Step Load Size (See
note)
Load Slew Rate
Test capacitive Load
+12VSB
1.0A
0.25 A/sec
20 F
+12V
60% of max load
0.25 A/sec
2000 F
Note: For dynamic condition +12V min loading is 1A.
2.2.4.6 Capacitive Loading
The power supply shall be stable and meet all requirements with the following capacitive
loading ranges.
Table 38.Capacitive Loading Conditions
Output
MIN
MAX
Units
+12VSB
20
3100
F
+12V
500
25000
F
2.2.4.7 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.
2.2.4.8 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.
2.2.4.9 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.