Datasheet

Power and Environmental Specifications Intel
®
Server Board S5000PAL/S5000XAL TPS
Revision 2.0
Intel order number: D31979-011
62
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 m . 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 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 37. 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