Technical Product Specification

Power Subsystem Intel® Server System R2000IP Product Family TPS
20 Revision 1.1
3.5.4 Power Recovery
The power supply will recover automatically after an AC power failure. AC power failure is
defined to be any loss of AC power that exceeds the dropout criteria.
3.5.5 Voltage Brown Out
The power supply shall comply with the limits defined in EN55024: 1998 using the IEC
61000-4-11:1995 test standard and performance criteria C defined in Annex B of CISPR
24.
In addition the power supply shall meet the following:
A continuous input voltage below the nominal input range shall not damage the power supply
or cause overstress to any power supply component. The power supply must be able to
return to normal power up state after a brownout condition. Maximum input current under a
continuous brownout shall not blow the fuse. The power supply should tolerate a 3min ramp
from 90VAC voltage to 0VAC after the components have reached a steady state condition.
3.5.6 Voltage Interruptions
The power supply shall comply with the limits defined in EN55024: 1998 using the IEC
61000-4-11:1995 test standard and performance criteria C defined in Annex B of CISPR 24.
3.5.7 AC Line Dropout/Holdup
An AC line dropout is defined to be when the AC input drops to 0VAC at any phase of the AC
line for any length of time. During an AC dropout of 12ms or less the power supply must
meet dynamic voltage regulation requirements over the rated load. An AC line dropout of
12ms or less shall not cause any tripping of control signals or protection circuits (= 12ms
holdup time requirement). If the AC dropout lasts longer than 12ms, the power supply
should recover and meet all turn-on requirements. The power supply must meet the AC
dropout requirement over rated AC voltages, frequencies, and output loading conditions.
Any dropout of the AC line shall not cause damage to the power supply.
3.5.8 AC Line 5VSB Holdup
The 5VSB output voltage should stay in regulation under its full load (static or dynamic)
during an AC dropout of 70ms min (=5VSB holdup time) whether the power supply is in ON
or OFF state (PSON asserted or de-asserted).
3.5.9 AC Line Fuse
The power supply shall have a single line fuse, on the Line (Hot) wire of the AC input. The
line fusing shall be acceptable for all safety agency requirements. The input fuse shall be a
slow blow type. AC inrush current shall not cause the AC line fuse to blow under any
conditions. All protection circuits in the power supply shall not cause the AC fuse to blow
unless a component in the power supply has failed. This includes DC output load short
conditions.
3.5.10 AC Inrush
The peak AC inrush current shall be less than 40A peak for one-quarter of the AC cycle and
less than the ratings of power supply’s critical AC input components, including: input fuse,
bulk caps, rectifiers, and surge limiting device. The power supply must meet the AC inrush