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Power Sub-System
3.3.8
Closed Loop Stability
The power supply shall be unconditionally stable under all line/load/transient load conditions
including capacitive load ranges specified in section 3.3.5. 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.
3.3.9
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.
3.3.10
Common Mode Noise
The Common Mode noise on any output shall not exceed 350mVp-p over the frequency band
of 10Hz to 20MHz.
1. The measurement shall be made across a 100Ω resistor between each of DC outputs,
including ground at the DC power connector and chassis ground (power subsystem
enclosure).
2. The test set-up shall use a FET probe such as Tektronix model P6046 or equivalent.
3.3.11
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.
3.3.12
Zero Load Stability Requirement
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.
3.3.13
Hot Swap Requirement
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
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Intel order number: G59059-006
®
Intel
Server Chassis H2000 Family TPS
Revision 1.5
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