Intel S1400SP4 DBS1400SP4 User Manual
Product codes
DBS1400SP4
Server Board Power Distribution
Intel® Server Board S1400SP TPS
Revision 1.0
Intel order number G64248-001
104
50Hz and 5kHz at duty cycles ranging from 10%-90%. The load transient repetition rate is only
a test specification. The
a test specification. The
∆ step load may occur anywhere within the MIN load to the MAX load
conditions.
Table 56. Transient Load Requirements
Output
∆ Step Load Size
(See note 2)
Load Slew Rate
Test capacitive Load
12V
18A
0.5 A/
µsec
2200
µF
1,2
+5VSB
0.5A
0.5 A/
µsec
20
µF
12.2.5
Capacitive Loading
The power supply shall be stable and meet all requirements with the following capacitive loading
ranges.
ranges.
Table 57. Capacitive Loading Conditions
Output
MIN
MAX
Units
+12V
500
8000
µF
+5VSB
20
350
µF
12.2.6
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 m
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 m
Ω. This path may be used to carry DC current.
12.2.7
Closed loop stability
The power supply shall be 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. The power supply manufacturer shall provide proof of the unit’s closed-loop
stability with local sensing through the submission of Bode plots. Closed-loop stability must be
ensured at the maximum and minimum loads as applicable.
including capacitive load ranges. A minimum of: 45 degrees phase margin and -10dB-gain
margin is required. The power supply manufacturer shall provide proof of the unit’s closed-loop
stability with local sensing through the submission of Bode plots. Closed-loop stability must be
ensured at the maximum and minimum loads as applicable.
12.2.8
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.
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.
12.2.9
Common Mode Noise
The Common Mode noise on any output shall not exceed 350mV pk-pk over the frequency
band of 10Hz to 20MHz.
band of 10Hz to 20MHz.