Intel S4600LT2, Технические характеристики продукции

Страница: 39 / 126

Intel® Server System R2000LH2/T2 Product Family TPS Power Subsystem
Revision 1.0 27
3.6.5 DC Line Fuse
The power supply has the -48VDC input fused. The fusing is acceptable for all safety agency
requirements. The DC inrush current does not cause the fuse to blow under any conditions. No
protection circuits in the power supply will cause the DC fuse to blow unless a component in the
power supply has failed. This includes DC output load short conditions.
3.6.6 DC Inrush
The maximum inrush current from power-on is limited to a level below the surge rating of the
input line cable; input diodes, fuse, and EMI filter components. The inrush current does not
exceed the I²t curve shown in ETS 300 132-2 Equipment Engineering (EE); Power Supply
Interface at the Input to Telecommunication Equipment; Part2: Operated by Direct Current (DC).
To allow multiple power cycling events and DC line transient conditions, the maximum I²t value
does not exceed 20% of the fuse maximum rating. Repetitive ON/OFF cycling of the DC input
line voltage does not damage the power supply or cause the input fuse to blow.
3.6.7 DC Line Surge Voltages (Line Transients)
The power supply demonstrates tolerance for transients in the input DC power line caused by
switching or lightning. The power supply is primarily tested and complies with the requirements
of EN61000-4-5: “Electrical Fast transients / Burst Requirements and Surge Immunity
Requirements” for surge withstand capability. The test voltage surge levels are to be 500Vpk for
each Line to Primary Earth Ground test (none required between the L1 and L2).

75VDC Line Transient Test
A standard line voltage momentary transient test is shown below. This test simulates a
momentary voltage overshoot. This does not affect the operation of the PSU, and the
output voltages remain in regulation.
This test is conducted every 10 sec for 30 min (180 times total).
- 48VDC
<= 3.0ms
10.0ms
Rise Time Fall Time
<= 3.0ms
- 75VDC
Figure 18. 75VDC Test

0V Line Transient Test
A standard line voltage momentary blackout test is shown below. This test simulates a
momentary switch throw off-on. The power supply restarts, not latches.
This test is conducted 3 times in 10 min intervals. Refer to document TP76200MP
Section 8.05-b , page 14, for this transient test setup.