Technical Product Specification

Table Of Contents
Power and Environmental Specifications Intel
®
Server Board S5400SF TPS
Revision 2.02
Intel order number: D92944-007
148
2. The test setup uses an FET probe such as Tektronix* model P6046 or equivalent.
9.2.12 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 0 Hz to 20 MHz 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 89. Ripple and Noise
+3.3 V +5 V +12 V1/2/3/4 -12 V +5 VSB
50 mVp-p 50 mVp-p 120 mVp-p 120 mVp-p 50 mVp-p
9.2.13 Soft Starting
The power supply contains a control circuit that 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. The rise time of 5 VSB is from 1.0 ms to 25 ms and the turn on/off is monotonic.
9.2.14 Timing Requirements
The timing requirements for the power supply operation are as follows:
The output voltages must rise from 10% to within regulation limits (T
vout_rise
) within 5 to 70
ms, except for 5 VSB, in which case it is allowed to rise from 1.0 to 25 ms.
The +3.3 V, +5 V and +12 V output voltages should start to rise approximately at the
same time.
All outputs must rise monotonically.
The +5 V output needs to be greater than the +3.3 V output during any point of the
voltage rise.
The +5 V output must never be greater than the +3.3 V output by more than 2.25 V.
Each output voltage should reach regulation within 50 ms (T
vout_on
) of each other during
turn on of the power supply.
Each output voltage should fall out of regulation within 400 msec (T
vout_off
) of each other
during turn off.
Figure 52 and Figure 53 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.