Technical Product Specification

Intel® Server Board S1400FP TPS Server Board Power Distribution
Revision 2.0 Intel order number G64246-003
107
12.1.9
Common Mode Noise
The Common Mode noise on any output does not exceed 350mV pk-pk over the frequency
band of 10Hz to 20MHz.
The measurement is made across a 100Ω resistor between each of DC outputs, including
ground at the DC power connector and chassis ground (power subsystem enclosure).
The test set-up shall use a FET probe such as Tektronix model P6046 or equivalent.
12.1.10
Ripple/Noise
The maximum allowed ripple/noise output of the power supply is defined in below Table 19. This
is measured over a bandwidth of 10Hz to 20MHz at the power supply output connectors.
A 10µF
tantalum capacitor in parallel with a 0.1µF ceramic capacitor is placed at the point of
measurement.
Table 58. Ripples and Noise
+3.3V
+5V
+12V 1
+12V 2
-12V
+5VSB
50mVp-p
50mVp-p
120mVp-p
120mVp-p
200mVp-p
50mVp-p
The test set-up shall be as shown below.
AC HOT
POWER SUPPLY
AC NEUTRAL
V
OUT
RETURN
V
AC GROUND
LOAD
SCOPE
LOAD MUST BE
ISOLATED FROM
THE GROUND OF
THE POWER
SUPPLY
10uF
.1uF
GENERAL NOTES:
1. LOAD THE OUTPUT WITH ITS MINIMUM
LOAD CURRENT.
2. CONNECT THE PROBES AS SHOWN.
3. REPEAT THE MEASUREMENTS WITH THE
MAXIMUM LOAD ON THE OUTPUT.
SCOPE NOTE:
USE A TEKTRONIX 7834 OSCILLOSCOPE WITH 7A13 AND
DIFFERENTIAL PROBE
P6055 OR EQUIVALENT.
Figure 25. Differential Noise test setup
Note: When performing this test, the probe clips and capacitors should be located close to the
load.
12.1.11
Timing Requirements
These are the timing requirements for the power supply operation. The output voltages rise from
10% to within regulation limits (T
vout_rise
) within 2 to 50ms, except for 5VSB - it is allowed to rise
from 1 to 25ms.
The +3.3V, +5V and +12V1, +12V2 output voltages should start to rise
approximately at the same time.
All outputs must rise monotonically. Each output voltage
reach regulation within 50ms (T
vout_on
) of each other during turn on the power supply. Each
output voltage fall out of regulation within 400ms (T
vout_off
) of each other during turn off. Table 21
shows the timing requirements for the power supply being turned on and off from the AC input,
with PSON held low and the PSON signal, with the AC input applied.