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 moun...
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. ...
Ssi eps2u power supply design guide, v2.1 contents 1 purpose.......................................................................................................................................................... 5 2 conceptual overview ................................................................
Ssi eps2u power supply design guide, v2.1 9 mtbf ............................................................................................................................................................ 30 10 agency requirements........................................................................
Ssi eps2u power supply design guide, v2.1 1 2 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 requirem...
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 requ...
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 e...
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 o...
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...
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 requi...
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 cycle 100% nominal ac voltage ranges 5...
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...
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, ...
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 ...
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 +12v2 (+12v3 or +12v4) 1, 2 yellow (yellow/blue strip...
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-...
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 ...
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 cont...
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...
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 betwe...
Ssi eps2u power supply design guide, v2.1 6.8 ripple / noise status required the maximum allowed ripple/noise output of the power supply is defined in table 22. This is measured over a bandwidth of 0 hz to 20 mhz at the power supply output connectors. A 10 µf tantalum capacitor in parallel with a 0....
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 fro...
Ssi eps2u power supply design guide, v2.1 status recommended item description min max units t vout_holdup time all output voltages stay within regulation 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 regula...
Ssi eps2u power supply design guide, v2.1 7 protection circuits status required protection circuits inside the power supply shall cause only the power supply’s main outputs to shutdown. If the power supply latches off due to a protection circuit tripping, an ac cycle off for 15 s and a pson # cycle ...
Ssi eps2u power supply design guide, v2.1 table 26: over current protection common plane split plane voltage over current limit (iout limit) over current limit (iout limit) +3.3 v 110% minimum; 150% maximum 110% minimum; 150% maximum +5 v 110% minimum; 150% maximum 110% minimum; 150% maximum +12v1 1...
Ssi eps2u power supply design guide, v2.1 8 control and indicator functions the following sections define the input and output signals from the power supply. Signals that can be defined as low true use the following convention: signal # = low true 8.1 pson# status required the pson # signal is requi...
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 power supply to indicate that all the outputs are within the regulation limits of the power supply. When any output voltage falls below regulation limits or when ac ...
Ssi eps2u power supply design guide, v2.1 8.3.2 fru data format the information to be contained in the fru device is 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 chassi...
Ssi eps2u power supply design guide, v2.1 8.3.2.2 multirecord area implement as defined by the ipmi fru document. The following record types shall be used on this power supply: • power supply information (record type 0x00) • dc output (record type 0x01) • no other record types are required for the p...
Ssi eps2u power supply design guide, v2.1 9 mtbf status recommended the power supply shall have a minimum mtbf at continuous 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 50 °c. 10 agency requirements status reco...
