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SSI ERP2U (Entry Redundant Power 2U) Power Supply Design Guide A Server System Infrastructure (SSI) Specification For 2U Rack Chassis Power Supplies Version 2.
SSI ERP2U Power Supply Design Guide, V2.31 - 2 - Revision History Orig./Rev. Description of Changes 2.0 Post design guide 2.2 Added higher power levels up to 800W. Added 350mm depth. Removed lower power levels. Added standby fan operation. Added option for tighter 12V regulation.
SSI ERP2U Power Supply Design Guide, V2.31 - 3 - Disclaimer: THIS SPECIFICATION IS PROVIDED "AS IS" WITH NO WARRA NTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE.
SSI ERP2U Power Supply Design Guide, V2.31 - 4 - Contents 1 Purpose........................................................................................................................ .................................. 7 2 Conceptual Overview ....
SSI ERP2U Power Supply Design Guide, V2.31 - 5 - 8.4 Power Supply Managem ent Interface .............................................................................................. ......... 31 8.5 Field Replacement Un it (FRU) Signals .............
SSI ERP2U Power Supply Design Guide, V2.31 - 6 - Table 34: FRU Device Product Inform ation Area ................................................................................. .................. 33 Table 35: LE D Indica tors ........................
SSI ERP2U Power Supply Design Guide, V2.31 - 7 - 1 2 Purpose This 2U Rack Power Supply Desig n Guide defines a common re dundant power sub -sy stem used in 2U rack mount servers. The power sub-system is made up of a cage and h ot swa p redundant powe r module s.
SSI ERP2U Power Supply Design Guide, V2.31 - 8 - 3 Definitions/T erms/Acronyms Required The status given to items within this design guide, which are required to meet SSI guidelines and a large ma jority of system appl ications.
SSI ERP2U Power Supply Design Guide, V2.31 - 9 - 4 Mechanical Overview STATUS Required (Optional) The ERP2U is a power sub-sy stem made up of a cage and redundant, hot swappable power supply modules. A mechanical drawing of the cag e is shown below in Figure 1 .
SSI ERP2U Power Supply Design Guide, V2.31 - 10 - 4.1 Acoustic Requirements STATUS Recommended It is recommended the power su pplie s have a variable speed fan b ase d on temperature and loading co nditions. There are three different acoustic sound powe r levels defined at different ambient temperatures and loadin g conditions.
SSI ERP2U Power Supply Design Guide, V2.31 - 11 - The power supply shall ope rate within all specified limits over the T op temperatu re rang e. All airflow shall pass through the power supply and not over t he ex terior surfaces of the power supply .
SSI ERP2U Power Supply Design Guide, V2.31 - 12 - Table 3: AC Input Rating PA RAME TE R MIN RA TED MA X Voltage (110) 90 V rms 100-127 V rm s 140 V rms Voltage (220) 180 V rms 200-240 V rms 264 V rms Frequency 47 Hz 63 Hz 5.
SSI ERP2U Power Supply Design Guide, V2.31 - 13 - AC line shall not cause damage to the powe r su pply. In the case of redundant AC inputs, the AC line dropout may occur on either or both AC inlet.
SSI ERP2U Power Supply Design Guide, V2.31 - 14 - recoverable Table 6: AC Line Surge Transient Performance AC Line Surge Duration Surge Operating AC Voltage Line Frequenc y Performance Criteria Contin.
SSI ERP2U Power Supply Design Guide, V2.31 - 15 - 6 DC Output Specification These are the output requirements for the po we r supply assembly including cage and module .
SSI ERP2U Power Supply Design Guide, V2.31 - 16 - If 240VA limiting is not a requirement for the power supply than all +12V outputs are common and ma y have the same wire color (yellow) .
SSI ERP2U Power Supply Design Guide, V2.31 - 17 - 2. If 240VA limiting is not a requirement for the power s upply than all +12V outputs are common and ma y have the same wire c olo r. 6.1.5 Serial ATA Power Connector STATUS Optional This is a required conn ecto r for systems with serial AT A devices.
SSI ERP2U Power Supply Design Guide, V2.31 - 18 - 1 SMBus Clock White/Green Stripe 2 SMBus Data White/Yellow Stripe 3 SMBAlert 4 ReturnS Black/White Stripe 5 3.3RS Orange/White Stripe 6.2 Grounding STATUS Required The ground of the pins of the power assembly wire h arn es s provid es the power return path.
SSI ERP2U Power Supply Design Guide, V2.31 - 19 - +12V1 0 A 16 A 18 A +12V2 0 A 16 A 18 A +12V3 0.9 A 14 A +12V4 0.1 A 8 A 13 A -12 V 0 A 0.5 A +5 VSB 0.1 A 2.0 A 1. Maximum continuous total DC output power should not exceed 550 W. 2. Maximum continuous combined load on +3.
SSI ERP2U Power Supply Design Guide, V2.31 - 20 - 4. Peak power and current loading shall be supported for a minimum of 10 second. 5. Maximum combined current for the 12 V outputs shall be 45 A. 6. Maximum 12V combined peak current shall be 54 A. 7. The 3.
SSI ERP2U Power Supply Design Guide, V2.31 - 21 - Table 18: 800 W Load Ratings Voltage Minimum Continuous Maximum Continuou s Peak +3.3 V 7 0.8 A 24 A +5 V 7 0.5 A 30 A +12V1 0 A 16 A 18 A +12V2 0 A 16 A 18 A +12V3 0.9 A 16 A 18 A +12V4 0.1 A 16 A 18 A -12 V 0 A 0.
SSI ERP2U Power Supply Design Guide, V2.31 - 22 - Table 19: Voltage Regulation Limits Parameter MIN NOM MAX Units Tolerance +3.3 V +3.14 +3.30 +3.47 V rm s +/-5% +5 V +4.75 +5.00 +5.25 V rms +/-5% +12V1,2,3,4 +11. 40 +12.00 +12.60 V rms +/-5% -12 V -10.
SSI ERP2U Power Supply Design Guide, V2.31 - 23 - Required The power supply shall be stable a nd meet all requirem ents, except dynamic loa ding requirements, with the following capacitive loading ranges. Note: Up to 10,000 μ F of the +12V capacitive loading may be on the +12V1 out put.
SSI ERP2U Power Supply Design Guide, V2.31 - 24 - 6.9 Redundancy The power sub-system ma y have different levels of redundancy dependi ng upon the availability requirements of the system. The Required, Reco mmen ded, and Optional items are broken down here.
SSI ERP2U Power Supply Design Guide, V2.31 - 25 - may be removed, then replaced with a g ood po wer supply, however, hot swap needs to work with ope ratio nal as well as failed power supplies.
SSI ERP2U Power Supply Design Guide, V2.31 - 26 - Table 25: Turn On/Off Timing Item Description MIN MAX UNITS T sb_on_delay Delay from AC being applied to 5 VSB being within regulation. 1500 ms T ac_on_delay Delay from AC being applied to all output volt ages being within regulation.
SSI ERP2U Power Supply Design Guide, V2.31 - 27 - Figure 4: Turn On/Off Timing AC Input Vout PWOK 5VSB N# PSO T sb_on_dela y T AC_on_dela y T pwok_on T vout_holdup T pwok_holdup T pson_on_dela y T sb .
SSI ERP2U Power Supply Design Guide, V2.31 - 28 - 7 Protection Circuits STATUS Required Protection circuits inside the power supply shall cause only the power supply’s m ain outputs to shutdown.
SSI ERP2U Power Supply Design Guide, V2.31 - 29 - 7.3 Over Voltage Protection STATUS Required The power supply over voltage protection shall be loca lly sensed in the hot swa p modules. The power supply shall shutdown and latch off after an over voltage conditi on occurs.
SSI ERP2U Power Supply Design Guide, V2.31 - 30 - 8 Control and Indicator Functions The following sections define the input and output si gnals from the power supply. Signals that can be defined as low true use the following co nventio n: signal # = low true 8.
SSI ERP2U Power Supply Design Guide, V2.31 - 31 - 8.2 PWOK (Power OK) STATUS Required PWOK is a power OK signal and will be pulled HIGH by the pow er supply to indicate that all the outputs are within the regulation limits of the power supply.
SSI ERP2U Power Supply Design Guide, V2.31 - 32 - PDB addressing A0/A1 0/0 0/1 1/0 1/1 Power supply PSMI device B0h B2h B4h B6h 8.5 Field Replacement Un it (FRU) Signals STATUS Optional The FRU device in the power supply shall derive its power off of the 5VSB out put on the system side of the or’ing device and grounded to ReturnS.
SSI ERP2U Power Supply Design Guide, V2.31 - 33 - FRU File ID {Not required} PAD Bytes {Added as necessary to allo w for 8-byte offset to next area} 8.
SSI ERP2U Power Supply Design Guide, V2.31 - 34 - available. The AMBER LED shall turn ON to indicate t hat the power supply has failed, shutdown due to over current, or shutdown due to over temperature. Refer to Table 35: LED Indicators for conditions of the LED(s).
SSI ERP2U Power Supply Design Guide, V2.31 - 35 - 9 MTBF STATUS Recommended The power module shall have a minimu m MTBF at continuo us operation of 1) 50,000 hours at 100% load and 45 ° C, as calculated by Bellcore RPP, or 2) 100,000 hours demonstrated at 100 % load and 5 0 ° C.
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