Intel Server Board S2400BB

Intel® Server Board S2400BB TPS
Revision 2.0
92
11.2.4 Dynamic Loading
The output voltages shall remain within limits specified for the step loading and capacitive loading specified in
the table below. The load transient repetition rate shall be tested between 50Hz and 5kHz 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 MIN load to the MAX load conditions.
Table 48. Transient Load Requirements
Output
∆ Step Load Size
Load Slew Rate
Test capacitive Load
+12VSB
1.0A
0.25 A/µsec
20 µF
+12V
60% of max load
0.25 A/µsec
2000 µF
Note: For dynamic condition +12V min loading is 1A.
11.2.5 Capacitive Loading
The power supply shall be stable and meet all requirements with the following capacitive loading ranges.
Table 49. Capacitive Loading Conditions
Output
MIN
MAX
Units
+12VSB
20
3100
µF
+12V
500
25000
µF
11.2.6 Grounding
The output ground of the pins of the power supply provides the output power return path. The output
connector ground pins shall be connected to the safety ground (power supply enclosure). This grounding
should be well designed to ensure passing the max allowed Common Mode Noise levels.
The power supply shall be provided with a reliable protective earth ground. All secondary circuits shall be
connected to protective earth ground. Resistance of the ground returns to chassis shall not exceed 1.0 mΩ.
This path may be used to carry DC current.
11.2.7 Closed loop stability
The power supply shall be unconditionally stable under all line/load/transient load conditions including specified
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.
11.2.8 Residual Voltage Immunity in Standby mode
The power supply should be immune to any residual voltage placed on its outputs (Typically a leakage voltage
through the system from standby output) up to 500mV. There shall be no additional heat generated, nor
stressing of any internal components with this voltage applied to any individual or all outputs simultaneously. It
also should not trip the protection circuits during turn on.
The residual voltage at the power supply outputs for no load condition shall not exceed 100mV when AC
voltage is applied and the PSON# signal is de-asserted.