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SSI America EPS2U manual

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Table of contents for the manual

  • Page 1

    SSI EPS2U Power Supply Design Guide A Server System Infrastructure (SSI) Specification For Entry Chassis Power Supplies Revision 2.1 Revision History Orig./Rev. Descripti on of Changes Date 1.0 Initial release of EPS2U specification 1.1 Updated EPS2U spec with an added 12V 240VA channel, updated mounting features, and added gold comment for gold si[...]

  • Page 2

    SSI EPS2U Power Supply Design Guide, V2.1 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. WITHOUT LIMITATION, THE PR OMOTERS (Int[...]

  • Page 3

    SSI EPS2U Power Supply Design Guide, V2.1 Contents 1 Purpose........................................................................................................................ .................................. 5 2 Conceptual Overview ............................................................................................................ .[...]

  • Page 4

    SSI EPS2U Power Supply Design Guide, V2.1 9 MTBF ........................................................................................................................... ................................. 30 10 Agency Requi rements ............................................................................................................ .......[...]

  • Page 5

    SSI EPS2U Power Supply Design Guide, V2.1 1 2 Purpose This 2U Rack Power Supply Specificatio n defines a comm on power supply used in entry-level serve rs. This supply may range typically from 400 to 700 watts and is used in a non-redundant configuration. The scop e of this document defines the requirements for o ne supply in this power range. The [...]

  • Page 6

    SSI EPS2U Power Supply Design Guide, V2.1 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 jorit y of system applications. Recommended The status given to items within this design guide which are not required to meet SSI guidelines, however, are r equ[...]

  • Page 7

    SSI EPS2U Power Supply Design Guide, V2.1 4 Mechanical Overview STATUS Required (Optional) Note: Some enclosure features are noted as o ptional in the drawing below. These features may be use in some chassis desig ns where only top access is allowed for the cag e mounting. The EPS2U is a power supply enclosure intended to handle a power range of 40[...]

  • Page 8

    SSI EPS2U Power Supply Design Guide, V2.1 4.1 Airflow Requirements STATUS Recommended The power supply shall have a two-spe ed fan(s) and prov ide cooling to both the supply an d the system. During low-speed fan operation, the power sup ply must not exceed a noise level of 43 dBa measured at one meter on all faces. At low fan speed, the power suppl[...]

  • Page 9

    SSI EPS2U Power Supply Design Guide, V2.1 5 AC Input Requirements STATUS Required The power supply shall incorpo rate universal power input wi th active power fact or correction, which shall reduce line harmonics in accordance with the E N 61000-3-2 and JEIDA MITI standa rds. 5.1 AC Inlet Connector STATUS Required The AC input connector shall be an[...]

  • Page 10

    SSI EPS2U Power Supply Design Guide, V2.1 5.4 AC Line Dropout STATUS Required An AC line dropout is defined to be when the AC input dr ops 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. An AC line dropo ut [...]

  • Page 11

    SSI EPS2U Power Supply Design Guide, V2.1 Table 4: AC Line Sag Transient Performance AC Line Sag Duration Sag Operating AC Voltage Li ne Frequency Performance Criteria Continuous 10% Nominal AC Voltage ranges 50/60 Hz No loss of function or performance 0 to 1 AC cycl e 100% Nominal AC Voltage ranges 50/60 Hz No loss of function or performance >1[...]

  • Page 12

    SSI EPS2U Power Supply Design Guide, V2.1 6 DC Output Specification 6.1 Output Connectors The power supply shall have one of the two follo wing output connector and wire harness configurations, depending upon the type of 12V rail conf iguratio n needed by the system. 6.1.1 12V Power Rail Configurations There are two types of 12V rail configur ation[...]

  • Page 13

    SSI EPS2U Power Supply Design Guide, V2.1 6.1.2 Baseboard power connector STATUS Required Connector housing: 24-Pin Molex 39-0 1-2240 or equivalent Contact: Molex 44476-1111 or equivalent Table 7: P1 Baseboard Power Connector – Common Plane Pin Signal 18 AWG Color Pin Signal 18 AWG Color 1 +3.3 VDC, 3.3RS 1 Orange, Orange/white stripe 13 +3.3 VDC[...]

  • Page 14

    SSI EPS2U Power Supply Design Guide, V2.1 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 color (yellow). 6.1.3 Processor Power Connector STATUS Required Connector housing: 8-Pin Molex 39-01-2080 or equiv alent Contact: Molex 44476-1111 or equivalent Table 9: Processor Pow[...]

  • Page 15

    SSI EPS2U Power Supply Design Guide, V2.1 6.1.4 Peripheral Power Connectors STATUS Required Connector housing: Amp 1-480424 -0 or equivalent Contact: Amp 61314-1 contact or equivalent Table 11: Peripheral Power Connecto rs Pin Signal 18 AWG Color 1 +12V2 (+12V3 or +12V4) 1, 2 Yellow (Yellow/Blue Stripe or Yello w/Green stripe) 1, 2 2 COM Black 3 CO[...]

  • Page 16

    SSI EPS2U Power Supply Design Guide, V2.1 If the optional server signal connecto r is not used on t he power supply or the connector is un plugged, the power supply shall utilize the 3.3RS on the baseboard connector (Pi n 1). Connector housing: 5-pin Molex 50-57-9405 o r equivalent Contacts: Molex 16-02-0088 or equival ent (gold plated) Table 13: S[...]

  • Page 17

    SSI EPS2U Power Supply Design Guide, V2.1 6.4 Output Power/Currents STATUS Recommended The following tables define the powe r and current ratings for 480 W, 550 W, 600 W, and 650 W power supplies. The combined output power of all outpu ts shall not exceed the rated output power. The power supply must meet both static and dynamic voltage regulatio n[...]

  • Page 18

    SSI EPS2U Power Supply Design Guide, V2.1 Table 16: 600 W Load Ratings – Split Plane Voltage Minimum Continuous Maximum Continuous Peak +3.3 V 0.8 A 24 A +5 V 0.5 A 20 A +12V1 0 A 12 A 15 A +12V2 0 A 12 A 15 A +12V3 0.9 A 14 A +12V4 0.1 A 8.0 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 6[...]

  • Page 19

    SSI EPS2U Power Supply Design Guide, V2.1 6.5 Voltage Regulation STATUS Required The power supply output voltages must stay within the following voltage limits when operating at steady state and dynamic loading conditions. These limits incl ude the peak-pea k ripple/noise specified in Section 5.8. All outputs are measured with reference to the retu[...]

  • Page 20

    SSI EPS2U Power Supply Design Guide, V2.1 6.6 Dynamic Loading STATUS Required The output voltages shall remain within the limits specifi ed in Table 18 for the ste p loading and within the limits specified in Table 20 for the capacitive loadin g. The load transient repetition rate shall be tested between 5 0 Hz and 5 kHz at duty cycles ranging from[...]

  • Page 21

    SSI EPS2U Power Supply Design Guide, V2.1 6.8 Ripple / Noise STATUS Required The maximum allowed ripple/noise out put of the power supply is defined in Table 22. This i s measured over a bandwidth of 0 Hz to 20 MHz at the power su pply output connectors. A 10 µ F tantalum capacitor in parallel with a 0.1 µ F ceramic capa citor are placed at the p[...]

  • Page 22

    SSI EPS2U Power Supply Design Guide, V2.1 V4 V3 V2 V1 T vout_off T vout_on T vout _ rise 10% Vout Vout Figure 2: Output Voltage Timing Table 24: 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 appl ied to all output voltages being[...]

  • Page 23

    SSI EPS2U Power Supply Design Guide, V2.1 STATUS Recommended Item Description MIN MAX UNITS T vout_holdup Time all output voltages stay within regulati on after loss of AC. 21 ms T pwok_holdup Delay from loss of AC to deassertion of PWOK. 20 ms T sb_holdup Time 5VSB output voltage stays within regulation after loss of AC. 70 ms Tsb_holdup PSON turn[...]

  • Page 24

    SSI EPS2U Power Supply Design Guide, V2.1 7 Protection Circuits STATUS Required Protection circuits inside the power supply shall cause only the power su pply’s main outputs to shutdown. If the power supply latches off due to a protection circuit tri pping, an AC cycle OFF for 15 s and a PSON # cycl e HIGH for 1 s must be able to reset the power [...]

  • Page 25

    SSI EPS2U Power Supply Design Guide, V2.1 Table 26: Over Current Protection Common Plane Split Plane Voltage Over Current Limit (Iout lim it) Over Current Limit (Iout limit) +3.3 V 110% minimum; 150% maxi mum 110% minimum; 150% maxi mum +5 V 110% minimum; 150% maxi mum 110% minimum; 150% maxi mum +12V1 18A minimum; 20A maximum; 22A peak 1 15A minim[...]

  • Page 26

    SSI EPS2U Power Supply Design Guide, V2.1 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 nvention: signal # = low true 8.1 PSON# STATUS Required The PSON # signal is required to remotely turn on/off the power supply. PS[...]

  • Page 27

    SSI EPS2U Power Supply Design Guide, V2.1 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. When any output voltag e falls below regulation limits or when AC powe r has been removed for a time sufficiently [...]

  • Page 28

    SSI EPS2U Power Supply Design Guide, V2.1 8.3.2 FRU Data Format The information to be contained in the FRU device i s shown in the following table. Table 30: FRU Device Information Area Type Description Common Header As defined by the FRU document Internal Use Area Not required, do not reserve Chassis Info Area Not applicable, do not reserve Board [...]

  • Page 29

    SSI EPS2U Power Supply Design Guide, V2.1 8.3.2.2 MultiRecord Area Implement as defined by the IPMI FRU document. The follo wing record types shall be used on this power sup ply: • Power Supply Information (Record Type 0x00) • DC Output (Record Type 0x01) • No other record types are r equired for the power supp ly. MultiRecord information sha[...]

  • Page 30

    SSI EPS2U Power Supply Design Guide, V2.1 9 MTBF STATUS Recommended The power supply shall have a minimum MTBF at continuous operat ion 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 50 ° C. 10 Agency Requirements STATUS Recommended The power supply must comply with al[...]