User manual ENHANCE EPS2U V1.2

[. . . ] SSI EPS2U Power Supply Design Guide A Server System Infrastructure (SSI) Specification For Entry Chassis Power Supplies Version 1. 2 SSI EPS2U Power Supply Design Guide, V1. 2 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 AMAGES, 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. This specification and the information herein is the confidential and trade secret information of the Promoters. Use, reproduction and disclosure of this specification and the information herein is subject to the terms of the S. S. I. [. . . ] The peak inrush current shall be less than the ratings of its critical components (including input fuse, bulk rectifiers, and surge limiting device). 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 40 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 2. - 10 - SSI EPS2U Power Supply Design Guide, V1. 2 5. 7 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 conditions 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 3: AC Line Sag Transient Performance AC Line Sag Duration Continuous 0 to 1 AC cycle >1 AC cycle Sag 10% 100% >10% Operating AC Voltage Nominal AC Voltage ranges Nominal AC Voltage ranges Nominal AC Voltage ranges Line Frequency 50/60 Hz 50/60 Hz 50/60 Hz Performance Criteria No loss of function or performance No loss of function or performance Loss of function acceptable, self recoverable Table 4: AC Line Surge Transient Performance AC Line Surge Duration Continuous 0 to ½ AC cycle Surge 10% 30% Operating AC Voltage Nominal AC Voltages Mid-point of nominal AC Voltages Line Frequency 50/60 Hz 50/60 Hz Performance Criteria No loss of function or performance No loss of function or performance 5. 8 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 surge-withstand test must not produce damage to the power supply. The supply must meet surge-withstand test conditions under maximum and minimum DC-output load conditions. - 11 - SSI EPS2U Power Supply Design Guide, V1. 2 6 6. 1 DC Output Specification Output Connectors The power supply shall have the following output connectors and wire harness configuration. 6. 1. 1 Required Baseboard power connector Connector housing: 24-Pin Molex 39-01-2240 or equivalent Contact: Molex 44476-1111 or equivalent Table 5: P1 Baseboard Power Connector Pin 1 2 3 4 5 6 7 8 9 10 11 12 Signal +3. 3 VDC +3. 3 VDC COM +5 VDC COM +5 VDC COM PWR OK 5 VSB +12 V2 +12 V2 +3. 3 VDC 18 AWG Color Orange Orange Black Red Black Red Black Gray Purple Yellow/Blue Stripe Yellow/Blue Stripe Orange Pin 13 14 15 16 17 18 19 20 21 22 23 24 Signal +3. 3 VDC -12 VDC COM PS_ON COM COM COM Reserved (-5 V in ATX) +5 VDC +5 VDC +5 VDC COM 18 AWG Color Orange Blue Black Green Black Black Black N. C. Red Red Red Black 6. 1. 2 Required Processor Power Connector Connector housing: 8-Pin Molex 39-01-2080 or equivalent Contact: Molex 44476-1111 or equivalent Table 6: Processor Power Connector Pin 1 2 3 4 Signal COM COM COM COM 18 AWG color Black Black Black Black Pin 5 6 7 8 Signal +12 V1 +12 V1 +12 V1 +12 V1 18 AWG Color Yellow/Black Stripe Yellow/Black Stripe Yellow/Black Stripe Yellow/Black Stripe - 12 - SSI EPS2U Power Supply Design Guide, V1. 2 6. 1. 3 Required Peripheral Power Connectors Connector housing: Amp 1-480424-0 or equivalent Contact: Amp 61314-1 contact or equivalent Table 7: Peripheral Power Connectors Pin 1 2 3 4 Signal +12V2 COM COM +5 VDC 18 AWG Color Yellow Black Black Red 6. 1. 4 Required Floppy Power Connector Connector housing: Amp 171822-4 or equivalent Table 8: P9 Floppy Power Connector Pin 1 2 3 4 Signal +5 VDC COM COM +12 V2 22 AWG Color Red Black Black Yellow 6. 1. 5 Optional Server Signal Connector Connector housing: 5-pin Molex 50-57-9405 or equivalent Contacts: Molex 16-02-0088 or equivalent (gold plated) Notes: It is recommended to use gold plated signal contacts on both the power supply connector and the baseboard header. If the optional server signal connector is not used on the power supply the 3. 3VRS and ReturnS lines shall be crimped into the contacts in the baseboard power connector. If the server signal connector is unplugged, the power supply shall not shutdown or go into an over voltage condition. Table 9: Server Signal Connector Pin 1 2 3 4 5 Signal I2C Clock I2C Data Reserved ReturnS 3. 3RS 24 AWG Color White/Green Stripe White/Yellow Stripe NA Black/White Stripe Orange/White Stripe - 13 - SSI EPS2U Power Supply Design Guide, V1. 2 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 may have remote sense for the +3. 3V (3. 3VS) and return (ReturnS) if the Optional Server Signal connector is implemented. The remote sense return (ReturnS) is used to regulate out ground drops for all output voltages; +3. 3V, +5 V, +12V1, +12V2, +12V3, -12 V, and 5 VSB. The 3. 3V remote sense (3. 3VS) is used to regulate out drops in the system for the +3. 3 V output. The remote sense input impedance to the power supply must be greater than 200 W on 3. 3 VS and ReturnS. This is the value of the resistor connecting the remote sense to the output voltage internal to the power supply. Remote sense must be able to regulate out a minimum of 200 mV drop on the +3. 3 V output. The remote sense return (ReturnS) must be able to regulate out a minimum of 200 mV drop in the power ground return. The current in any remote sense line shall be less than 5 mA to prevent voltage sensing errors. The power supply must operate within specification over the full range of voltage drops from the power supply's output connector to the remote sense points. - 14 - SSI EPS2U Power Supply Design Guide, V1. 2 6. 4 Output Power/Currents STATUS Recommended The following table defines the power and current ratings for a 480 W power supply. [. . . ] See Figure 4 for a representation of the timing characteristics of PWOK. The start of the PWOK delay time shall be inhibited as long as any power supply output is in current limit. Table 22: PWOK Signal Characteristics Signal Type Open collector/drain output from power supply. Power OK Power Not OK PWOK = High PWOK = Low MIN Logic level low voltage, Isink = 4 mA Logic level high voltage, Isource=200 µA Sink current, PWOK = low Source current, PWOK = high PWOK delay: Tpwok_on PWOK rise and fall time Power down delay: T 1 ms pwok_off MAX 0. 4 V 5. 25 V 4 mA 2 mA 0V 2. 4 V 200 ms 1000 ms 100 µs 200 ms - 25 - SSI EPS2U Power Supply Design Guide, V1. 2 8. 3 Field Replacement Unit (FRU) Signals STATUS Optional Two pins will be allocated for the FRU information on the power supply connector. [. . . ]