Design and Environmental Specifications Intel® Server Board SE7520JR2
Revision 1.0
C78844-002
206
enclosure). This grounding must be 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.
8.2.3 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 200Ω on 3.3VS,
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 200mV drop on
the +3.3V output. The remote sense return (ReturnS) must be able to regulate out a minimum of
200mV drop in the power ground return. The current in any remote sense line shall be less than
5mA 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.
8.2.4 Standby Outputs
The 5VSB output shall be present when an AC input greater than the power supply turn on
voltage is applied.
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