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SSI
EPS2U
Power Supply Design Guide
A Server System Infrastructure (SSI) Specification
For Entry Chassis Power Supplies
Revision 2.1
Revision History
Orig./Rev. Description of Changes Date
1.0 Initial release of EPS2U specification
1.1 Updated EPS2U spec with an added 12V 240VA channel, updated mounting 4/14/02
features, and added gold comment for gold signal contacts
1.2 Approved EPS2U specification including changes from 4/23/2002 SSI council meeting 4/23/02
2.
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SSI EPS2U Power Supply Design Guide, V2.1 Disclaimer: THIS SPECIFICATION IS PROVIDED "AS IS" WITH NO WARRANTIES 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 PROMOTERS (Intel Corporation, NEC Corporation, Dell Computer Corporation, Data General a division of EMC Corporation, Compaq Computer Corporation, Silicon Graph
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SSI EPS2U Power Supply Design Guide, V2.1 Contents 1 Purpose.......................................................................................................................................................... 5 2 Conceptual Overview ................................................................................................................................... 5 3 Definitions/Terms/Acronyms............................................................................................
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SSI EPS2U Power Supply Design Guide, V2.1 9 MTBF............................................................................................................................................................ 30 10 Agency Requirements................................................................................................................................ 30 Figures Figure 1: Enclosure Drawing ............................................................................................
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SSI EPS2U Power Supply Design Guide, V2.1 1 Purpose This 2U Rack Power Supply Specification defines a common power supply used in entry-level servers. This supply may range typically from 400 to 700 watts and is used in a non-redundant configuration. The scope of this document defines the requirements for one supply in this power range. The parameters of this supply are defined in this specification for open industry use. This specification defines 480W, 550W, 600W, and 650W power su
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SSI EPS2U Power Supply Design Guide, V2.1 3 Definitions/Terms/Acronyms Required The status given to items within this design guide, which are required to meet SSI guidelines and a large majority of system applications. Recommended The status given to items within this design guide which are not required to meet SSI guidelines, however, are required by many system applications. Optional The status given to items within this design guide, which are not required to meet SSI guidelines,
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SSI EPS2U Power Supply Design Guide, V2.1 4 Mechanical Overview STATUS Required (Optional) Note: Some enclosure features are noted as optional in the drawing below. These features may be use in some chassis designs where only top access is allowed for the cage mounting. The EPS2U is a power supply enclosure intended to handle a power range of 400W to 700W. A mechanical drawing of the power supply cage is shown below in Figure 1. Optional mounting features for top access mounti
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SSI EPS2U Power Supply Design Guide, V2.1 4.1 Airflow Requirements STATUS Recommended The power supply shall have a two-speed fan(s) and provide cooling to both the supply and the system. During low-speed fan operation, the power supply must not exceed a noise level of 43 dBa measured at one meter on all faces. At low fan speed, the power supply shall provide a minimum of 12 CFM of airflow with 0.003 inH2O of system backpressure. At high fan speed, the power supply shall provide
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SSI EPS2U Power Supply Design Guide, V2.1 5 AC Input Requirements STATUS Required The power supply shall incorporate universal power input with active power factor correction, which shall reduce line harmonics in accordance with the EN61000-3-2 and JEIDA MITI standards. 5.1 AC Inlet Connector STATUS Required The AC input connector shall be an IEC 320 C-14 power inlet. This inlet is rated for 15 A/250 VAC. 5.2 AC Input Voltage Specification STATUS Required The power supply
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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 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. An AC line dropout of one cycle or less shall not cause any tripping of control signals or protection circuits. If the AC dropout lasts longer than one cycl
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SSI EPS2U Power Supply Design Guide, V2.1 Table 4: AC Line Sag Transient Performance AC Line Sag Duration Sag Operating AC Voltage Line Frequency Performance Criteria Continuous 10% Nominal AC Voltage ranges 50/60 Hz No loss of function or performance 0 to 1 AC 100% Nominal AC Voltage ranges 50/60 Hz No loss of function or performance cycle >1 AC cycle >10% Nominal AC Voltage ranges 50/60 Hz Loss of function acceptable, self recoverable Table 5: AC Line Surge Transient Performance
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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 following output connector and wire harness configurations, depending upon the type of 12V rail configuration needed by the system. 6.1.1 12V Power Rail Configurations There are two types of 12V rail configurations for systems: ‘Common plane’ and ‘split plane’ processor power delivery. The ‘common plane’ system has both processors powered from a single
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SSI EPS2U Power Supply Design Guide, V2.1 6.1.2 Baseboard power connector STATUS Required Connector housing: 24-Pin Molex 39-01-2240 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, Orange, 13 +3.3 VDC Orange 1 3.3RS Orange/white stripe 2 +3.3 VDC Orange 14 -12 VDC Blue 3 COM Black 15 COM Black 4 +5 VDC Red 16 PS_ON Green 5 COM Black 17 COM Black 6 +5 V
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SSI EPS2U Power Supply Design Guide, V2.1 2. If 240VA limiting is not a requirement for the power supply than all +12V outputs are common and may have the same wire color (yellow). 6.1.3 Processor Power Connector STATUS Required Connector housing: 8-Pin Molex 39-01-2080 or equivalent Contact: Molex 44476-1111 or equivalent Table 9: Processor Power Connector – Common Plane Pin Signal 18 AWG color Pin Signal 18 AWG Color 1 COM Black 5 +12 V1 Yellow/Black Stripe 2 COM Black 6 +
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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 Connectors Pin Signal 18 AWG Color 1, 2 1, 2 1 +12V2 (+12V3 or +12V4) Yellow (Yellow/Blue Stripe or Yellow/Green stripe) 2 COM Black 3 COM Black 4 +5 VDC Red 1. The +12V power to peripherals may be split between the second, third, or fourth +12V channel for the purpos
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SSI EPS2U Power Supply Design Guide, V2.1 If the optional server signal connector is not used on the power supply or the connector is unplugged, the power supply shall utilize the 3.3RS on the baseboard connector (Pin 1). Connector housing: 5-pin Molex 50-57-9405 or equivalent Contacts: Molex 16-02-0088 or equivalent (gold plated) Table 13: Server Signal Connector Pin Signal 24 AWG Color 1 I2C Clock White/Green Stripe 2 I2C Data White/Yellow Stripe 3 Reserved NA 4 ReturnS Black/W
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SSI EPS2U Power Supply Design Guide, V2.1 6.4 Output Power/Currents STATUS Recommended The following tables define the power and current ratings for 480 W, 550 W, 600 W, and 650 W power supplies. The combined output power of all outputs shall not exceed the rated output power. The power supply must meet both static and dynamic voltage regulation requirements for the minimum loading conditions. Table 14: 480 W Load Ratings – Common Plane Voltage Minimum Continuous Maximum Continu
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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 600 W. 2. Maximum continuous combined load on +3.3 VDC and +5 VDC outputs shall not exceed 140 W. 3. Maximum peak total DC output
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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 include the peak-peak ripple/noise specified in Section 5.8. All outputs are measured with reference to the return remote sense (ReturnS) signal. The 5 V, 12V1, 12V2, 12V3, –12 V and 5 VSB outputs are measured at the power supply connectors referenc
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SSI EPS2U Power Supply Design Guide, V2.1 6.6 Dynamic Loading STATUS Required The output voltages shall remain within the limits specified in Table 18 for the step loading and within the limits specified in Table 20 for the capacitive loading. The load transient repetition rate shall be tested between 50 Hz and 5 kHz at duty cycles ranging from 10%-90%. The load transient repetition rate is only a test specification. The ∆ step load may occur anywhere within the MIN load to the MA
