Technical Product Specification

Table Of Contents
Intel
®
Server Board S5400SF TPS Power and Environmental Specifications
Revision 2.02
Intel order number: D92944-007
147
9.2.8 Dynamic Loading
The output voltages remain within limits for the step loading and capacitive loading specified in
the following table. The load transient repetition rate is tested between 50 Hz and 5 kHz at duty
cycles ranging from 10%-90%. The load transient repetition rate is only a test specification. The
 step load may occur anywhere within the minimum load to the maximum load conditions.
Table 87. Transient Load Requirements
Output Step Load Size
(See note 2)
Load Slew Rate Test capacitive Load
+3.3 V 5.0 A
0.25 A/ sec 250 F
+5 V 6.0 A
0.25 A/ sec 400 F
12 V1 +12 V2 +
12 V3 +12 V4
28.0 A
0.25 A/ sec 2200 F
1,2
+5 VSB 0.5 A
0.25 A/ sec 20 F
Notes:
1. Step loads on each 12 V output may happen simultaneously.
2. The +12 V should be tested with 2200 F evenly split between the four +12 V rails.
9.2.9 Capacitive Loading
The power supply is stable and meets all requirements with the following capacitive loading
ranges.
Table 88. Capacitive Loading Conditions
Output Minimum Maximum Units
+3.3V 250 6,800
F
+5V 400 4,700
F
+12V1,2,3,4 500 each 11,000
F
-12V 1 350
F
+5VSB 20 350
F
9.2.10 Closed-Loop Stability
The power supply is unconditionally stable under all line/load/transient load conditions including
capacitive load ranges. A minimum of 45 degrees phase margin and -10dB-gain margin is
required. Closed-loop stability must be ensured at the maximum and minimum loads as
applicable.
9.2.11 Common Mode Noise
The common mode noise on any output does not exceed 350 mV pk-pk over the frequency
band of 10 Hz to 30 MHz.
1. The measurement is made across a 100 resistor between each of the DC outputs,
including ground, at the DC power connector and chassis ground (power subsystem
enclosure).