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- EPS1U
- Design Manual
SSI America EPS1U Design Manual
Summary of EPS1U
Page 1
Ssi eps1u power supply design guide, v1.1 eps1u power supply design guide a server system infrastructure (ssi) specification for 1u rack chassis power supplies version 1.1.
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Ssi eps1u power supply design guide, v1.1 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. ...
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Ssi eps1u power supply design guide, v1.1 contents 1 purpose .......................................................................................................................................................... 5 2 conceptual overview................................................................
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Ssi eps1u power supply design guide, v1.1 9 mtbf............................................................................................................................................................. 30 10 agency requirements .......................................................................
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Ssi eps1u power supply design guide, v1.1 1 purpose this specification defines a non-redundant power supply that supports 1u rack mount entry server systems. The entry-level power supply is not intended to be a hot swap type of power supply. The parameters of this supply are defined in this specific...
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Ssi eps1u power supply design guide, v1.1 3 definitions/terms/acronyms table 1: definitions, terms, and acronyms (listed alphabetically) 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...
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Ssi eps1u power supply design guide, v1.1 4 mechanical overview there are two physical sizes of the power supply enclosure intended to accommodate power levels of 125w, 250w and 350w. There are two output connector designs. A card edge solution to provide ease of installation and removal and a wire ...
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Ssi eps1u power supply design guide, v1.1 4.2 alternate enclosure status small power form factor systems may require a smaller power supply enclosure. Figure 2 details a smaller power supply enclosure for such systems. This form factor accommodates power levels of 250w and 125w. The supply will prov...
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Ssi eps1u power supply design guide, v1.1 4.3 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 shall not exceed a noise level of 38 dba measured at one meter ...
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Ssi eps1u power supply design guide, v1.1 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...
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Ssi eps1u power supply design guide, v1.1 5.4 efficiency status required the power supply shall have a minimum efficiency of 68% at maximum load and over the specified ac voltage. There is no efficiency requirement for the 125w version. 5.5 ac line dropout status required an ac line dropout is defin...
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Ssi eps1u power supply design guide, v1.1 status recommended an additional inrush current limit is recommended for some system applications that require multiple systems on a single ac circuit. Ac line inrush current shall not exceed 30 a peak for one-quarter of the ac cycle, after which, the input ...
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Ssi eps1u power supply design guide, v1.1 6 dc output specification 6.1 connector status required the power supply uses a blind mating type connector with edge fingers (see figure 1) to connect the power supply’s output voltages and signals to a connector located in the system. The card edge pin ass...
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Ssi eps1u power supply design guide, v1.1 figure 3: edge finger layout 1.6 0.38 x 45 2x 5vsb pson# acwarning pwok bottom view of power supply reserved 31 1 62 32 keying notch 3.3v 5v 12v2 -12v sda scl psalert# 3.3vs retu rns top view of power supply reserved removed pin (nc) reserved reserved 12v2 g...
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Ssi eps1u power supply design guide, v1.1 6.2 grounding status required the ground of the pins of the power supply wire harness provides the power return path. The wire harness ground pins shall be connected to safety ground (power supply enclosure). 6.3 remote sense status optional the power supply...
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Ssi eps1u power supply design guide, v1.1 status low power recommendation table 7: 125 w load ratings load range voltage minimum continuous maximum continuous peak +3.3 v 0.5 a 6 a +5 v 0.5 a 12 a +12 v1 0.25 a 3 a 6 a +12 v2 not used for 125w version. -12 v 0 a 0.2 a +5 vsb 0.1 a 1.0 a 1. Maximum c...
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Ssi eps1u power supply design guide, v1.1 status high power recommendation table 9: 350 w load ratings load range 1 voltage minimum continuous maximum continuous peak +3.3 v 1.5 a 16 a +5 v 1.0 a 12 a +12 v1 1.5 a 16 a see note 2 +12 v2 1.5 a 16 a see note 2 -12 v 0 a 0.5 a +5 vsb 0.1 a 2.0 a load r...
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Ssi eps1u power supply design guide, v1.1 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 6.8. All...
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Ssi eps1u power supply design guide, v1.1 6.7 capacitive loading status required the power supply shall be stable and meet all requirements with the following capacitive loading ranges. Table 13: capacitive loading conditions output min max units +3.3 v 10 6,800 µ f +5 v 10 4,700 µ f +12 v 10 11,000...
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Ssi eps1u power supply design guide, v1.1 6.9 timing requirements status required these are the timing requirements for the power supply operation. The output voltages must rise from 10% to within regulation limits (t vout_rise ) within 5 to 70 ms. The +3.3 v, +5 v and +12 v output voltages should s...
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Ssi eps1u power supply design guide, v1.1 table 16: turn on/off timing item description min max units tsb_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 voltages being within regulation. 2500 ms tvout_holdup time...
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Ssi eps1u power supply design guide, v1.1 figure 5: turn on/off timing (signal power supply) ac input vout pwok 5vsb pson# t sb_on_delay t ac_on_delay t pwok_on t vout_holdup t pwok_holdup t pson_on_delay t sb_on_delay t pwok_on t pwok_off t pwok_off t pson_pwok t pwok_low t sb_vout ac turn on/off c...
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Ssi eps1u power supply design guide, v1.1 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 seconds and a pson # ...
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Ssi eps1u power supply design guide, v1.1 7.3 over voltage protection status required the power supply over voltage protection shall be locally sensed. The power supply shall shutdown and latch off after an over voltage condition occurs. This latch shall be cleared by toggling the pson # signal or b...
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Ssi eps1u power supply design guide, v1.1 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 requ...
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Ssi eps1u power supply design guide, v1.1 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 ...
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Ssi eps1u power supply design guide, v1.1 8.3 acwarning status optional this is an output signal from the power supply which provides a warning to the system that the power supply has lost its ac input. This signal also provides a signal to synchronize the turn on of multiple power supplies. At turn...
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Ssi eps1u power supply design guide, v1.1 8.4 field replacement unit (fru) signals status optional two pins will be allocated for the fru information on the power supply connector. One pin is the serial clock (scl). The second pin is used for serial data (sda). Both pins are bi-directional and are u...
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Ssi eps1u power supply design guide, v1.1 8.4.2.2 multirecord area 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 power suppl...
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Ssi eps1u power supply design guide, v1.1 8.5 led indicator status required there will be a single green led to indicate power supply status. When ac is applied to the psu and standby voltages are available the led shall blink green. The led shall turn on green to indicate that all the power outputs...
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Ssi eps1u power supply design guide, v1.1 10 agency requirements status recommended the power supply must comply with all regulatory requirements for its intended geographical market. Depending on the chosen market, regulatory requirements may vary. Although a power supply can be designed for worldw...