Server Board Power Distribution Intel® Server Board S1200V3RP TPS
Revision 1.2
The residual voltage at the power supply outputs for no load condition does not exceed 100mV
when AC voltage is applied and the PSON# signal is de-asserted.
13.1.9 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.
13.1.10 Ripple/Noise
The maximum allowed ripple/noise output of the power supply is defined in below table. This is
measured over a bandwidth of 10Hz to 20MHz at the power supply output connectors. A 10F
tantalum capacitor in parallel with a 0.1F ceramic capacitor is placed at the point of
measurement.
Table 68. Ripples and Noise
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 50. Differential Noise test setup
Note: When performing this test, the probe clips and capacitors should be located close to the
load.
13.1.11 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. The table below
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