Technical Product Specification

Power Sub-System Intel

Server Chassis H2000 Family TPS

Revision 1.0

Intel order number: G59059-001

+12V

STB

120mVp-p

3.3.7 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. This path may be used to carry DC current.

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 4.6. 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.