S5000PAL datasheet(71/112 Pages) INTEL

71 / 112 page

Power and Environmental Specifications

Intel

® Server Board S5000PAL / S5000XAL TPS

Revision 1.7

Intel order number: D31979-010

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

Ω. 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

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.

8.2.7

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

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

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