Technical Product Specification

Intel® Server System SR1695WB TPS Power Sub-System
Revision 1.4 19
Intel order number: E92079-005
3.5.6 Transient loading
The power supply shall operate within specified limits and meet regulation requirements over
the following transient loading conditions anywhere within the specified load range of the
power supply. This shall be tested with no additional bulk capacitance added to the load.
Table 23 shows the transient loading.
Table 23. Transient loading
Output Step Size Slew Rate Capacitive Load
+12V 60% of max 0.5A/usec 2200uF
+5VSB 25% of max 0.5A/usec 1uF
Note: when test the transient loading, the 12V limit is +/-5%
3.5.7 Capacitive load
The power supply shall operate within specifications over the capacitive load defined. shows
the capacitive load. The power supply shall operate within specifications over the capacitive
load defined. Table 24 shows the capacitive load.
Table 24. Capacitive Load
Output Min Max
+12V 10uF 11,000uF
+5VSB 1uF 350uF
3.5.8 Maximum load change
The power supply shall continue to operate normally when there is a step change < 1 A/uS
between minimum load and maximum load.
3.5.9 Load sharing control(+12V load sharing)
The +12V output shall have active load sharing. When operating at 50% of full load, the
output current of any two power supplies shall be within (+/-6.5%). For example, if power
supply #1 is operating at 20A, then all other power supplies within the system shall be
operating between 18.7A to 21.3A (+/-6.5% of 20A). All current sharing functions shall be
implemented internal to the power supply by making use of the 12VLS signal. The power
supply must connect the 12VLS signals between the power supplies together. The power
supply shall be able to share with up to 1+1 power supply in parallel.
If the load sharing is disabled by shorting the load share bus to ground, the power supply
shall continue to operate within regulation limits for loads less than or equal to the rating of
one power supply.
3.5.10 Output voltage rise time
The turn on waveform for the +12V output shall be monotonic with less than 5% of overshoot.
The rise time from 10 % (1.2V) to 90% (10.8V) shall be less than 50msec for a single power
supply.