Intel
®
Server Board S5500BC TPS
Power and Environmental Specifications
Revision 1.0
Intel order number: E42249-003
71
Note: The grounding should be well designed to ensure passing the maximum allowed
common mode noise levels.
The power supply should be provided with a reliable protective earth ground. All secondary
circuits should be connected to protective earth ground. Resistance of the ground returns to the
chassis should not exceed 1.0 m
. This path can be used to carry the DC current.
8.2.4
Standby Outputs
The 5 VSB output should be present when an AC input greater than the power supply turn on
voltage is applied.
8.2.5
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. 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 should be less than 5 mA to
prevent voltage sensing errors. The power supply must operate within the specification over the
full range of voltage drops from the power supply output connector to the remote sense points.
8.2.6 Voltage
Regulation
The power supply output voltages must remain within the following limits when operating at
steady state and dynamic loading conditions. These limits include the peak-peak ripple/noise.
