Intel S5000XAL manual Grounding, Standby Outputs, Remote Sense, Voltage Regulation

Intel® Server Board S5000PAL / S5000XAL TPS Power and Environmental Specifications

8.2.4Grounding

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 mΩ. This path may be used to carry DC current.

8.2.5Standby Outputs

The 5VSB output shall be present when an AC input greater than the power supply turn on voltage is applied.

8.2.6Remote 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 Ω 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.

8.2.7Voltage 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 38. Voltage Regulation Limits

PARAMETER	TOLERANCE	MIN	NOM	MAX	UNITS
+ 3.3V	- 5% / +5%	+3.14	+3.30	+3.46	Vrms
+ 5V	- 5% / +5%	+4.75	+5.00	+5.25	Vrms
+ 12V1,2,3,4	- 5% / +5%	+11.40	+12.00	+12.60	Vrms
- 12V	- 5% / +9%	-10.80	-12.00	-13.20	Vrms
+ 5VSB	- 5% / +5%	+4.75	+5.00	+5.25	Vrms

Revision 1.4	73
	Intel order number: D31979-007