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Intel
Entry Server Chassis SC5299-E TPS
+3.3V
50mVp-p
2.2.4.20
Soft Starting
The power supply contains a control circuit that provides monotonic soft start for its outputs
without overstressing the AC line or any power supply components at any specified AC line or
load conditions. There is no requirement for rise time on the 5Vstby but the turn on/off is
monotonic.
2.2.4.21
Zero Load Stability Requirements
When the power subsystem operates in a no-load condition, it does not need to meet the output
regulation specification, but it must operate without any tripping of over-voltage or other fault
circuitry. When the power subsystem is subsequently loaded, it must begin to regulate and
source current without fault.
2.2.4.22
Timing Requirements
The timing requirements for power supply operation are as follows. The output voltages must
rise from 10% to within regulation limits (T
allowed to rise from 1.0 to 25ms. The +3.3V, +5V and +12V output voltages should start to rise
approximately at the same time. All outputs must rise monotonically. The +5V output needs to
be greater than the +3.3V output during any point of the voltage rise. The +5V output must
never be greater than the +3.3V output by more than 2.25V. Each output voltage shall reach
regulation within 50ms (T
voltage shall fall out of regulation within 400msec (T
following figure 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.
Revision 3.1
Table 43. Ripple and Noise
+5V
+12V1/2
50mVp-p
120mVp-p
vout_rise
) of each other during turn on of the power supply. Each output
vout_on
Table 44. Output Voltage Timing
Description
Intel order number D37594-005
-12V
120mVp-p
) within 5 to 70ms, except for 5VSB - it is
) of each other during turn off. The
vout_off
Minimum
5.0*
Power Sub-system
+5VSB
50mVp-p
Maximum
Units
70*
msec
50
msec
400
msec
39
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