Power Supply Specification Guidelines Intel® Server Board S2600CO Family TPS
Revision 1.0
Intel order number G42278-002
Table 65. Capacitive Loading Conditions
12.1.3.4 Grounding
The output ground of the pins of the power supply provides the output power return path. The
output connector ground pins are connected to the safety ground (power supply enclosure).
This grounding is well designed to ensure passing the max allowed Common Mode Noise
levels.
The power supply is provided with a reliable protective earth ground. All secondary circuits are
connected to protective earth ground. Resistance of the ground returns to chassis does not
exceed 1.0 m. This path may be used to carry DC current.
12.1.3.5 Residual Voltage Immunity in Standby mode
The power supply is immune to any residual voltage placed on its outputs (Typically a leakage
voltage through the system from standby output) up to 500mV. There is neither additional heat
generated, nor stressing of any internal components with this voltage applied to any individual
or all outputs simultaneously. It also does not trip the protection circuits during turn on.
The residual voltage at the power supply outputs for no load condition does not exceed 100mV
when AC voltage is applied and the PSON# signal is de-asserted.
12.1.3.6 Common Mode Noise
The Common Mode noise on any output does not exceed 350mV pk-pk over the frequency
band of 10Hz to 20MHz.
The measurement is made across a 100Ω resistor between each of DC outputs, including
ground at the DC power connector and chassis ground (power subsystem enclosure).
The test set-up shall use a FET probe such as Tektronix model P6046 or equivalent.
12.1.3.7 Ripple/Noise
The maximum allowed ripple/noise output of the power supply is defined in the table below. This
is measured over a bandwidth of 10Hz to 20MHz at the power supply output connectors. A
10F tantalum capacitor in parallel with a 0.1F ceramic capacitor is placed at the point of
measurement.
Table 66. Ripples and Noise
The test set-up is as shown below:
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