Technical Product Specification

Table Of Contents
Power and Environmental Specifications Intel
®
Server Board S5400SF TPS
Revision 2.02
Intel order number: D92944-007
146
9.2.4 Grounding
The grounds of the power supply output connector pins provide the power return path. The
output connector ground pins should be connected to safety ground (power supply enclosure).
This grounding is well designed to ensure passing the maximum 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.
9.2.5 Standby Outputs
The 5 VSB output is present when an AC input greater than the power supply turn-on voltage is
applied.
9.2.6 Remote Sense
The power supply has remote sense return (ReturnS) to regulate out ground drops for all output
voltages: +3.3 V, +5 V, +12 V1, +12 V2, +12 V3, -12 V, and 5 VSB. The power supply uses
remote sense (3.3 VS) to regulate out drops in the system for the +3.3 V output.
The +5 V, +12 V1, +12 V2, +12 V3, –12 V and 5 VSB outputs only use remote sense referenced
to the ReturnS signal. The remote sense input impedance to the power supply must be greater
than 200  on 3.3 VS and 5 VS. This is the value of the resistor connecting the remote sense to
the output voltage internal to the power supply.
The remote sense must be able to regulate out a minimum of a 200 mV drop on the +3.3 V
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.
9.2.7 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 86. Voltage Regulation Limits
Parameter Tolerance Minimum Normal Maximum Units
+ 3.3 V - 5%/+5% +3.14 +3.30 +3.46 V
rms
+ 5 V - 5%/+5% +4.75 +5.00 +5.25 V
rms
+ 12 V1,2,3,4 - 5%/+5% +11.40 +12.00 +12.60 V
rms
- 12 V - 10%/+10% -10.80 -12.00 -13.20 V
rms
+ 5 VSB - 5%/+5% +4.75 +5.00 +5.25 V
rms