Datasheet

Power and Environmental Specifications Intel
®
Server Board S5000PAL/S5000XAL TPS
Revision 2.0
Intel order number: D31979-011
64
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 F tantalum capacitor in parallel with a 0.1 F 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 50mVp-p 120mVp-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 (T
vout_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 (T
vout_on
) of each other during turn on of the power supply. Each output
voltage shall fall out of regulation within 400 msec (T
vout_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.