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Design and Environmental Specifications Intel® Server Boards S5000PSL and S5000XSL TPS
Revision 1.2
Intel order number: D41763-003
82
8.3.1 Grounding
The grounds of the pins of the power supply output connector provide the power return path.
The output connector ground pins is connected to safety ground (power supply enclosure). This
grounding should is designed to ensure passing the maximum allowed common mode noise
levels.
8.3.2 Standby Outputs
The 5 VSB output shall be present when an AC input greater than the power supply turn on
voltage is applied.
8.3.3 Remote Sense
The power supply has remote sense return 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 remote sense return signal. The remote sense input impedance to the power supply must
be greater than 200 Ω 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.
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 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.