Page 2 - SSI
SSI ERP2U Power Supply Design Guide, V1.0 - 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, SPECIFICATI...
Page 3 - Contents
SSI ERP2U Power Supply Design Guide, V1.0 - 3 - Contents 1 Purpose ..............................................................................................................................................5 2 Conceptual Overview.......................................................................
Page 4 - Figures
SSI ERP2U Power Supply Design Guide, V1.0 - 4 - 8.2 PWOK (Power OK) .......................................................................................................................... 27 8.3 SMBus Communication .....................................................................................
Page 5 - Purpose; These rails are typically as follows:; NOTE
SSI ERP2U Power Supply Design Guide, V1.0 - 5 - 1 Purpose This 2U Rack Power Supply Design Guide defines a common redundant power sub-system used in 2U rack mount servers. The power sub-system is made up of a cage and hot swap redundant power modules. This Design Guide covers the mechanical and elec...
Page 7 - Mechanical Overview; STATUS; Figure 1: Enclosure Drawing; Power Module
SSI ERP2U Power Supply Design Guide, V1.0 - 7 - 4 Mechanical Overview STATUS Required (Optional) Note: Some features are noted as optional in the enclosure drawing figure below. These features may be use in some chassis designs where only top access is allowed for the cage mounting. The ERP2U is a p...
Page 8 - Optional Chassis Mounting Features; Optional; Airflow Requirements; Recommended
SSI ERP2U Power Supply Design Guide, V1.0 - 8 - 4.1 Optional Chassis Mounting Features STATUS Optional The optional top access mounting method fastens to the system chassis via three mounting holes; two on the exterior face and one with the tab on the interior face of the cage. There are also four r...
Page 9 - Redundant Cooling; Temperature Requirements; Table 1: Thermal Requirements; AC Input Requirements; AC Inlet Connector
SSI ERP2U Power Supply Design Guide, V1.0 - 9 - 4.2.1 Redundant Cooling STATUS Recommended It is recommended that the power supply cooling be redundant. This means the cooling device is located in the hot swap power supply modules or there are redundant devices located on the cage. 4.3 Temperature R...
Page 10 - AC Input Voltage Specification
SSI ERP2U Power Supply Design Guide, V1.0 - 10 - power supplies shall continue to operate with no interruption of performance. It is required that all redundant power supply modules be present to support redundant AC inlets. 5.3 AC Input Voltage Specification STATUS Required The power supply must op...
Page 11 - AC Line Dropout; Required; Required
SSI ERP2U Power Supply Design Guide, V1.0 - 11 - 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 regulatio...
Page 12 - AC Line Transient Specification; Table 4: AC Line Sag Transient Performance; AC Line Sag; Table 5: AC Line Surge Transient Performance; AC Line Surge; AC Line Fast Transient Specification; The power supply shall meet the
SSI ERP2U Power Supply Design Guide, V1.0 - 12 - 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 nomi...
Page 13 - DC Output Specification; Output Connectors; Required Baseboard power connector; Table 6: P1 Baseboard Power Connector; Optional Processor Power Connector
SSI ERP2U Power Supply Design Guide, V1.0 - 13 - 6 DC Output Specification These are the output requirements for the power supply assembly including cage and module. 6.1 Output Connectors The power supply assembly shall have the following output connectors and wire harness configuration. 6.1.1 Requi...
Page 14 - Required Peripheral Power Connectors; Contact: Amp 61314-1 contact or equivalent; Required Floppy Power Connector; Connector housing: Amp 171822-4 or equivalent; Pin
SSI ERP2U Power Supply Design Guide, V1.0 - 14 - 6.1.3 Required Peripheral Power Connectors Connec tor housing: Amp 1-480424-0 or equivalent Contact: Amp 61314-1 contact or equivalent Table 8: Peripheral Power Connectors Pin Signal 18 AWG Color 1 +12V2 (or +12V3) Yellow 2 COM Black 3 COM Black 4 +5 ...
Page 15 - Optional Server Signal Connector; Table 10: Server Signal Connector
SSI ERP2U Power Supply Design Guide, V1.0 - 15 - 6.1.5 Optional Server Signal Connector Connec tor 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 t...
Page 17 - Standby Outputs; Voltage Regulation
SSI ERP2U Power Supply Design Guide, V1.0 - 17 - 6.4.1 Standby Outputs STATUS Required The 5 VSB output shall be present when an AC input greater than the power supply turn on voltage is applied. 6.5 Voltage Regulation STATUS Required The power assembly output voltages must stay within the following...
Page 18 - Dynamic Loading; Table 15: Transient Load Requirements; Capacitive Loading; Table 16: Capacitve Loading Conditions
SSI ERP2U Power Supply Design Guide, V1.0 - 18 - 6.6 Dynamic Loading STATUS Required The output voltages shall remain within the limits specified in Table 13 for the step loading and within the limits specified in Table 15 for the capacitive loading. The load transient repetition rat e shall be test...
Page 19 - Table 17: Ripple and Noise; Hot Swap Requirements
SSI ERP2U Power Supply Design Guide, V1.0 - 19 - Table 17: Ripple and Noise +3.3 V +5 V +12 V -12 V +5 VSB 50 mVp -p 50 mVp -p 120 mVp -p 120 mVp -p 50 mVp -p 6.9 Redundancy The power sub-system may have different levels of redundancy depending upon the availability requirements of the system. The R...
Page 21 - Timing Requirements; Figure 2: Output Voltage Timing
SSI ERP2U Power Supply Design Guide, V1.0 - 21 - 6.11 Timing Requirements STATUS Required These are the timing requirements for the power assembly operation. The output voltages must rise from 10% to within regulation limits (T vout_rise ) within 5 to 200ms. The +3.3 V, +5 V and +12 V output voltage...
Page 24 - Protection Circuits; Table 20: Over Current Protection; Voltage
SSI ERP2U Power Supply Design Guide, V1.0 - 24 - 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 #...
Page 25 - Table 21: Over Current Protection; Over Voltage Protection; Table 22: Over Voltage Limits; Output Voltage; Over Temperature Protection; C of ambient temperature hysteresis.
SSI ERP2U Power Supply Design Guide, V1.0 - 25 - Table 21: Over Current Protection Voltage Over Current Limit (Iout limit) +3.3 V 110% minimum; 150% maximum +5 V 110% minimum; 150% maximum +12V1,2,3 Peak current minimum; 20A maximum 7.3 Over Voltage Protection STATUS Required The power supply over v...
Page 26 - Control and Indicator Functions; signal
SSI ERP2U Power Supply Design Guide, V1.0 - 26 - 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 i...
Page 28 - SMBus Communication; Module FRU Data; Table 25: FRU Device Information
SSI ERP2U Power Supply Design Guide, V1.0 - 28 - 8.3 SMBus Communication STATUS Optional There may be SMBus communication to the power assembly to monitor the cage and modules. This would require a serial EEPROM to store FRU data of each module and communicate the information onto the SMBus. There m...
Page 29 - Power Supply Information (Record Type 0x00); Field Information Definition
SSI ERP2U Power Supply Design Guide, V1.0 - 29 - A s s et Tag {Not used, code is zero length byte} FRU File ID {Not required} PAD Bytes {Added as necessary to allow for 8 -byte offset to next area} 8.3.3.2 MultiRecord Area As defined by the IPMI FRU document. The following record types shall be used...
Page 30 - Table 28: LED Indicators
SSI ERP2U Power Supply Design Guide, V1.0 - 30 - 8.4 LED Indicators STATUS Required There shall be a single bi-color LED OR two LEDs, one AMBER and one GREEN, on each hot swap power module to indicate power supply status. When AC is applied to the power supply and standby voltages are available the ...
Page 31 - MTBF; Agency Requirements
SSI ERP2U Power Supply Design Guide, V1.0 - 31 - 9 MTBF STATUS Recommended The power module 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. The power cage shall have...
