User manual ENHANCE EPS1U V1.1

[. . . ] 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 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. WITHOUT LIMITATION, THE PROMOTERS (Intel Corporation, NEC Corporation, Dell Computer Corporation, Data General a division of EMC Corporation, Compaq Computer Corporation, Silicon Graphics Inc. , and International Business Machines Corporation) DISCLAIM ALL LIABILITY FOR COST OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOST PROFITS, LOSS OF USE, LOSS OF DATA OR ANY INCIDENTAL, CONSEQUENTIAL, DIRECT, INDIRECT, OR SPECIAL DAMAGES, WHETHER UNDER CONTRACT, TORT, WARRANTY OR OTHERWISE, ARISING IN ANY WAY OUT OF USE OR RELIANCE UPON THIS SPECIFICATION OR ANY INFORMATION HEREIN. The Promoters disclaim all liability, including liability for infringement of any proprietary rights, relating to use of information in this specification. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted herein. [. . . ] A 125W output load shall be applied to the 125W version, a 250 W output load shall be applied for the 250 W version and a 350 W output load shall be applied to the 350 W version. Maximum rated input current is measured at 100 VAC and 200 VAC. 5. 3 Input Under Voltage STATUS Required The power supply shall contain protection circuitry such that application of an input voltage below the minimum specified in section 5. 2 shall not cause damage to the power supply. 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 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 cycle, the power supply should recover and meet all turn on requirements. The power supply must meet the AC dropout requirement over rated AC voltages, frequencies, and output loading conditions. Any dropout of the AC line shall not cause damage to the power supply. 5. 6 AC Line Fuse STATUS Required The power supply shall incorporate one input fuse on the LINE side for input over current protection to prevent damage to the power supply and meet product safety requirements. Fuses should be slow blow type or equivalent to prevent nuisance trips. AC inrush current shall not cause the AC line fuse to blow under any conditions. All protection circuits in the power supply shall not cause the AC fuse to blow unless a component in the power supply has failed. STATUS Optional Some system applications may require a second input fuse in the NEUTRAL side of the AC input. In this case two fuses would be required; one in the LINE side and one in the NEUTRAL side of the AC inlet to the power supply. 5. 7 AC Inrush STATUS Required The power supply must meet inrush requirements for any rated AC voltage, during turn on at any phase of AC voltage, during a single cycle AC dropout condition, during repetitive ON/OFF cycling of AC, and over the specified temperature range (Top). The peak inrush current shall be less than the ratings of its critical components (including input fuse, bulk rectifiers, and surge limiting device). 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 current should be no more than the specified maximum input current from Table 3. 5. 8 AC Line Transient Specification STATUS Recommended AC line transient conditions shall be defined as "sag" and "surge" conditions. Sag conditions (also referred to as "brownout" conditions) will be defined as the AC line voltage dropping below nominal voltage. Surge will be defined as the AC line voltage rising above nominal voltage. The power supply shall meet the requirements under the following AC line sag and surge conditions. Table 4: AC Line Sag Transient Performance Operating AC Voltage Line Frequency Performance Criteria Nominal AC Voltage ranges Nominal AC Voltage ranges Nominal AC Voltage ranges 50/60 Hz 50/60 Hz 50/60 Hz No loss of function or performance No loss of function or performance Loss of function acceptable, selfrecoverable Duration Continuous 0 to 1 AC cycle > 1 AC cycle Sag 10% 100% >10% Duration Continuous 0 to ½ AC cycle Surge 10% 30% Table 5: AC Line Surge Transient Performance Operating AC Voltage Line Frequency Performance Criteria Nominal AC Voltages Mid-point of nominal AC Voltages 50/60 Hz 50/60 Hz No loss of function or performance No loss of function or performance 5. 9 AC Line Fast Transient Specification STATUS Recommended The power supply shall meet the EN61000-4-5 directive and any additional requirements in IEC1000-4-5:1995 and the Level 3 requirements for surge-withstand capability, with the following conditions and exceptions: · · · These input transients must not cause any out-of-regulation conditions, such as overshoot and undershoot, nor must it cause any nuisance trips of any of the power supply protection circuits. The supply must meet surge-withstand test conditions under maximum and minimum DC-output load conditions. SSI EPS1U Power Supply Design Guide, V1. 1 6 6. 1 DC Output Specification 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 connector located in the system is an AMP 1364999-1 or equivalent. Signals that can be defined as low true or high true use the following convention: signal = low true. [. . . ] At turn on, this signal is pulled LOW when the supply's internal bulk voltage has reached a level that allows it to turn on. At turn off ACWarning goes HIGH when the internal bulk voltage drops low enough. The characteristics of the ACWarning signal is shown in Table 22: ACWarning Signal Characteristics. Table 22: ACWarning Signal Characteristics Open collector/drain output from power supply. [. . . ]