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Server Board S5000PAL / S5000XAL TPS Power and Environmental Specifications
Revision 1.4
Intel order number: D31979-007
73
8.2.4 Grounding
The grounds of the pins of the power supply output connector provide the power return path. The output
connector ground pins shall be connected to safety ground (power supply enclosure). This grounding
should be well designed to ensure passing the maximum 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
mΩ. This path may be used to carry DC current.
8.2.5 Standby Outputs
The 5VSB output shall be present when an AC input greater than the power supply turn on voltage is
applied.
8.2.6 Remote Sense
The power supply has remote sense return (ReturnS) to regulate out ground drops for all output voltages:
+3.3V, +5V, +12V1, +12V2, +12V3, -12V, and 5VSB. The power supply uses remote sense (3.3VS) to
regulate out drops in the system for the +3.3V output. The +5V, +12V1, +12V2, +12V3, –12V and 5VSB
outputs only use remote sense referenced to the ReturnS signal. The remote sense input impedance to
the power supply must be greater than 200 Ω on 3.3VS and 5VS; this is the value of the resistor
connecting the remote sense to the output voltage internal to the power supply. Remote sense must be
able to regulate out a minimum of a 200 mV drop on the +3.3V output. The remote sense return
(ReturnS) must be able to regulate out a minimum of a 200 mV drop in the power ground return. The
current in any remote sense line shall be less than 5 mA to prevent voltage sensing errors. The power
supply must operate within specification over the full range of voltage drops from the power supply’s
output connector to the remote sense points.
8.2.7 Voltage Regulation
The power supply output voltages must stay within the following voltage limits when operating at steady
state and dynamic loading conditions. These limits include the peak-peak ripple/noise.
Table 38. Voltage Regulation Limits
PARAMETER TOLERANCE MIN NOM MAX UNITS
+ 3.3V - 5% / +5% +3.14 +3.30 +3.46 V
rms
+ 5V - 5% / +5% +4.75 +5.00 +5.25 V
rms
+ 12V1,2,3,4 - 5% / +5% +11.40 +12.00 +12.60 V
rms
- 12V - 5% / +9% -10.80 -12.00 -13.20 V
rms
+ 5VSB - 5% / +5% +4.75 +5.00 +5.25 V
rms