Technical Product Specification

Power Subsystem Intel® Server System SR2625UR TPS

Intel order number E46130-010 Revision 1.8

3.8.3 AC Line Dropout/Holdup

An AC line dropout is defined to be when the AC input drops to 0 VAC at any phase of the AC

line for any length of time. During an AC dropout of one cycle or less, the power supply must

meet dynamic voltage regulation requirements over the rated load. If the AC dropout lasts

longer than one cycle, 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 does not cause damage to the

power supply.

 20 ms minimal when tested under the following conditions: Maximum combined load =

562.5 W

 12 ms minimal when tested under the following conditions: Maximum combined load =

750 W

3.8.4 AC Line 5 VSB Holdup

The 5 VSB output voltage should stay in regulation under its full load (static or dynamic) during

an AC dropout of 70 ms minimal (= 5 VSB holdup time) whether the power supply is in ON or

OFF state (PSON asserted or de-asserted).

3.8.5 AC Inrush

AC line inrush current should not exceed 40 A peak for up to one-quarter of the AC cycle, after

which the input current should be no more than the specified maximum input current. The peak

inrush current should be less than the ratings of its critical components (including input fuse,

bulk rectifiers, and surge limiting device).

The power supply must meet the inrush requirements for any rated AC voltage, during turn on

at any phase of AC voltage, during a single cycle AC dropout condition as well as upon

recovery after AC dropout of any duration, and over the specified temperature range (T

). It is

acceptable that AC line inrush current may reach up to 60 A peak for up to 1 millisecond.

3.9 Protection Circuits

Protection circuits inside the PDB and the power supply cause the power supply’s main +12 V

output to shut down, or cause a shutdown of any of the three outputs on the PDB. Any one of

these shutdowns results in shutting down the entire power supply/PDB combination. If the

power supply latches off due to a protection circuit tripping, an AC cycle OFF for 15 seconds

resets the power supply and the PDB.

3.9.1 Over-current Protection (OCP)

Each DC/DC converter output on the PDB has individual OCP protection circuits. The power

supply and power distribution board (PS and PDB) shut down and latch off after an over-current

condition occurs. This latch is cleared by toggling the PSON# signal or by an AC power

interruption. The over-current limits are measured at the PDB harness connectors.