S5000PAL datasheet(73/112 Pages) INTEL

73 / 112 page

Power and Environmental Specifications

Intel

® Server Board S5000PAL / S5000XAL TPS

Revision 1.7

Intel order number: D31979-010

8.2.12

Ripple / Noise

The maximum allowed ripple/noise output of the power supply is defined in the following table. This is

measured over a bandwidth of 0Hz to 20MHz at the power supply output connectors. A 10

μF tantalum

capacitor in parallel with a 0.1

μF ceramic capacitor are placed at the point of measurement.

Table 40. Ripple and Noise

+3.3V

+5V

+12V1/2/3/4

-12V

+5VSB

50mVp-p

120mVp-p

50mVp-p

8.2.13

Soft Starting

The power supply shall contain a control circuit which provides a monotonic soft start for its outputs

without overstress of the AC line or any power supply components at any specified AC line or load

conditions. There is no requirement for rise time on the 5 V standby, but the turn on/off shall be

monotonic.

8.2.14

Timing Requirements

These are the timing requirements for the power supply operation. The output voltages must rise from

10% to within regulation limits (Tvout_rise) within 5 to 70 ms, except for 5VSB; it is allowed to rise from 1.0 to

25 ms. All outputs must rise monotonically. Each output voltage shall reach regulation within 50 ms

(Tvout_on) of each other during turn on of the power supply. Each output voltage shall fall out of regulation

within 400 msec (Tvout_off) of each other during turn off. The following diagrams show the timing

requirements for the power supply being turned on and off via the AC input with PSON held low, and the

PSON signal with the AC input applied.

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