Technical Product Specification

Power Supply Specification Guidelines Intel® Server Board S1600JP TPS
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.
10.2.7
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.
10.2.8
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.
10.2.9
Common Mode Noise
The Common Mode noise on any output shall not exceed 350mV pk-pk over the frequency
band of 10Hz to 20MHz.
10.2.10
Soft Starting
The Power Supply shall contain control circuit which provides monotonic soft start for its outputs
without overstress of the AC line or any power supply components at any specified AC line or
load conditions.
10.2.11
Zero Load Stability Requirements
When the power subsystem operates in a no load condition, it does not need to meet the output
regulation specification, but it must operate without any tripping of over-voltage or other fault
circuitry. When the power subsystem is subsequently loaded, it must begin to regulate and
source current without fault.
10.2.12
Hot Swap Requirements
Hot swapping a power supply is the process of inserting and extracting a power supply from an
operating power system.
During this process the output voltages shall remain within the limits
with the capacitive load specified.
The hot swap test must be conducted when the system is
operating under static, dynamic, and zero loading conditions. The power supply shall use a
latching mechanism to prevent insertion and extraction of the power supply when the AC power
cord is inserted into the power supply.
10.2.13
Forced Load Sharing
The +12V output will have active load sharing. The output will share within 10% at full load. The
failure of a power supply should not affect the load sharing or output voltages of the other
supplies still operating.
The supplies must be able to load share in parallel and operate in a hot-
swap/redundant 1+1 configurations.
The 12VSB output is not required to actively share current
178 Revision 1.9