Electrical
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Table 4-12: PCIE AIC and PSU Power Budget used for Peak Power Excursion
Power Excursion as a
% of PSU Size
Time for
Power
Excursion
(TE)
Testing
Duty Cycle
≤450 watts or
any PSU without
a 12VHPWR
connector
450 Watts
< PSU <
1000 watts
≥1000
watts
150% 200% 200% 110 us 5%
130% 130% 150% 1 ms 8%
120% 120% 120% 10 ms 12.5%
110% 110% 110% 100 ms 25%
100% 100% 100% Infinite --
The 200% Peak Power Excursion time increases compare to what is listed in Table 3-3
to include the time it takes for I_PSU% to report that the power supply is above 100%
plus the time it takes for the processor to react to that level of power excursion.
The Testing Duty Cycle is the same as defined in Section 3.1.2, which is needed to
test a specific power supply.
The Test Criteria for these peak power excursions are different than what was
specified in Section 3.1.2. When a PSU includes I_PSU%, Table 4-13 and Table 4-14
show the RMS test conditions based on the power excursions defined. For all power
supplies with a rated wattage different than the two examples shown will require a
similar RMS calculation to be performed.
Table 4-13: Duty Cycle Example Test Criteria for a 750W PSU – RMS
Duty Cycle
Time Constant
(TC)
Time for Power
Excursion (TE)
Power
@ TC
Power @
TE
5% 1890 µs 110 µs 688.2 W 1500 W
8% 11.5 ms 1 ms 727.2 W 975 W
12.5% 70 ms 10 ms 726 W 900 W
25% 300 ms 100 ms 723 W 825 W
Table 4-14: Duty Cycle Example Test Criteria for a 1000W PSU – RMS
Duty Cycle
Time Constant (TC) Time for Power
Excursion (TE)
Power
@ TC
Power @
TE
5% 1890 µs 110µS 917.7 W 2000w
8% 11.5 ms 1mS 944.1 W 1500w
12.5% 70 ms 10mS 968.1 W 1200w
25% 300 ms 100mS 964.4 W 1100w
NOTES:
The Capacitive Load mentioned in Table 4-6 is expected to be applied to this test
scenario.
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