Intel SPSH4 - Server Platform - 0 MB RAM, Technical Product Specification

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Power supply Subsystem SPSH4 Server System External Product Specification
Revision 1.11 30
4.2.4.5 Power Timing
Power timing refers to the timing requirements for single power supply operation. The output
voltages must rise from 10% to within regulation limits (T
vout_rise
) within 5 to 200ms. 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, however, never by more than 2.25V.
Each output voltage reaches regulation within 100ms (T
vout_on
) of each other and begin to turn
off within 100ms (T
vout_on
) of each other. Figure 14 shows the timing requirements for a single
power supply being turned on and off via the AC input, with PSON held low and the PSON
signal, with the AC input applied. The ACOK
#
signal is not being used to enable the turn on
timing of the power supply.
Table 22: Output Voltage Timing
Item Description Min Max Units
T
vout_rise
Output voltage rise time from each main output. 5 200 msec
T
vout_off
All main outputs must be within regulation of each other within this time. 300 msec
T
vout_on
All main outputs must be within regulation of each other within this time. 100 msec
Figure 14: Output Voltage Timing
Table 23: Turn On/Off Timing
Vout
10% Vout
T
vout rise
T
vout on
T
vout_off
V1
V2
V3
V4