Technical Product Specification
Intel® Server Boards S4600LH2/T2 TPS
Revision 2.0
115
11.1.3.8 Common Mode Noise
The Common Mode noise on any output shall not exceed 350mV pk-pk over the frequency band of 10Hz to
20MHz.
11.1.3.9 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.
11.1.3.10 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.
11.1.3.11 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 DC power cord is inserted into the power supply.
11.1.3.12 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
12VSBoutput is not required to actively share current between power supplies (passive sharing). The
12VSBoutput 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.
11.1.3.13 Ripple / Noise
The maximum allowed ripple/noise output of the power supply is defined in the following table. This is measured over a
bandwidth of 10Hz to 20MHz at the power supply output connectors. A 10µF tantalum capacitor in parallel with a 0.1µF
ceramic capacitor is placed at the point of measurement.
Table 63. Ripples and Noise
+12V main
+12VSB
120mVp-p
120mVp-p