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Power Sub-system
2.4.3.4
DC/DC Converters Ripple/Noise
The maximum allowed ripple/noise output of each DC/DC Converter is defined in the following
table. This is measured over a bandwidth of 0Hz to 20MHz at the PDB output connectors. A
10 F tantalum capacitor in parallel with a 0.1 F ceramic capacitor is placed at the point of
measurement.
Note: Refer to the Power Supply specification for the equivalent data on +12V and +5VSB output.
2.4.3.5
Fan Operation in Standby Mode
The fans on the power distribution board continue to operate at their lowest speed (5V) when in
standby mode.
2.4.3.6
Timing Requirements
The timing requirements for the power supply/PDB combination are as follows. The output
voltages must rise from 10% to within regulation limits (T
5VSB, which is allowed to rise from 1.0 to 25 ms. The +3.3V, +5V, and +12V output voltages
start to rise at approximately the same time. All outputs rise monotonically. The +5V output is
greater than the +3.3V output during any point of the voltage rise. The +5V output is never
greater than the +3.3V output by more than 2.25V. Each output voltage reaches regulation
within 50ms (T
) of each other during turn on of the power supply. Each output voltage falls
vout_on
out of regulation within 400 msec (T
shows 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.
Item
T
Output voltage rise time from each main output.
vout_rise
T
All main outputs must be within regulation of each
vout_on
other within this time.
T
All main outputs must leave regulation within this
vout_off
time.
* The 5VSB output voltage rise time shall be from 1.0 ms to 25.0 ms.
72
Table 88. Ripple and Noise
+3.3V Output
+5V Output
50mVp-p
) of each other during turn off. The following figure
vout_off
Table 89. Output Voltage Timing
Description
Intel order number D37594-005
®
Intel
Entry Server Chassis SC5299-E TPS
-12V Output
50mVp-p
120mVp-p
) within 5 to 70 ms, except for
vout_rise
Minimum
5.0*
Maximum
Units
70*
msec
50
msec
400
msec
Revision 3.1
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