Intel® Server Board S2600CW Family TPS
Power Supply Specification Guidelines
Revision 2.4
129
The power supply is provided with a reliable protective earth ground. All secondary circuits is
connected to protective earth ground. Resistance of the ground returns to chassis does not
exceed 1.0 m
Ω
. This path may be used to carry DC current.
10.2.4.7
Residual Voltage Immunity in Standby Mode
The power supply is immune to any residual voltage placed on its outputs (Typically a leakage
voltage through the system from standby output) up to 500mV. There is neither additional
heat generated, nor stressing of any internal components with this voltage applied to any
individual or all outputs simultaneously. It also does not trip the protection circuits during turn
on.
The residual voltage at the power supply outputs for no load condition does not exceed
100mV when AC voltage is applied and the PSON# signal is de-asserted.
10.2.4.8
Common Mode Noise
The Common Mode noise on any output does not exceed 350mV pk-pk over the frequency
band of 10Hz to 20MHz.
The measurement is made across a 100Ω resistor between
each of DC outputs, including
ground at the DC power connector and chassis ground (power subsystem enclosure).
The test setup shall use a FET probe such as Tektronix* model P6046 or equivalent.
10.2.4.9
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 remains within the limits
with the capacitive load specified. The hot swap test is conducted when the system is
operating under static, dynamic, and zero loading conditions. The power supply uses a
latching mechanism to prevent insertion and extraction of the power supply when the AC
power cord is inserted into the power supply.
10.2.4.10
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 does not affect the load sharing or output voltages of the other
supplies still operating. The supplies are 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 between power supplies (passive sharing). The 12VSB output of the power supplies
are connected together in the system so that a failure or hot swap of a redundant power
supply does not cause these outputs to go out of regulation in the system.
10.2.4.11
Ripple/Noise
The maximum allowed ripple/noise output of the power supply is defined in the table below.
This is measured over a bandwidth of 10Hz to 20MHz at the power supply output connectors.