Intel
®
Server System P4000CP Power System Options Intel
®
Server Board S2600CP and Server System P4000CP TPS
Revision 1.1
Intel order number G26942-003
132
Table 81. Ripples and Noise
+3.3V +5V +12V 1, 2, 3 -12V +5VSB
50mVp-p 50mVp-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 53. Differential Noise test setup
Note: When performing this test, the probe clips and capacitors should be located close to
the load.
13.2.5.11 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, +12V3 output voltages start to rise
approximately at the same time. All outputs 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 83. Table
83
shows the timing requirements for the power supply being turned on and off by the AC input,
with PSON held low and the PSON signal, with the AC input applied. All timing requirements are
met for the cross loading condition in Table 77.
Table 82. Output Voltage Timing
Item Description MIN MAX UNITS
T
vout_rise
Output voltage rise time from each main output. 2 50 ms
Output rise time for the 5Vstby output. 1 25 ms
T
vout_on
All main outputs must be within regulation of each
other within this time.
50 ms
T
vout_off
All main outputs must leave regulation within this
time.
400 ms
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