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EPS2U Power Supply Design Guide, V2.1
Contents
1 Purpose.......................................................................................................................................................... 5
2 Conceptual Overview ................................................................................................................................... 5
3 Definitions/Terms/Acronyms....................................................................................................................... 6
4 Mechanical Overview ................................................................................................................................... 7
4.1 Airflow Requirements.................................................................................................................................. 8
4.2 Temperature Requirements ........................................................................................................................ 8
5 AC Input Requirements................................................................................................................................ 9
5.1 AC Inlet Connector...................................................................................................................................... 9
5.2 AC Input Voltage Specification ................................................................................................................... 9
5.3 Efficiency..................................................................................................................................................... 9
5.4 AC Line Dropout........................................................................................................................................ 10
5.5 AC Line Fuse ............................................................................................................................................ 10
5.6 AC Inrush .................................................................................................................................................. 10
5.7 AC Line Transient Specification................................................................................................................ 10
5.8 AC Line Fast Transient Specification........................................................................................................ 11
6 DC Output Specification ............................................................................................................................ 12
6.1 Output Connectors.................................................................................................................................... 12
6.1.1 12V Power Rail Configurations.......................................................................................................... 12
6.1.2 Baseboard power connector.............................................................................................................. 13
6.1.3 Processor Power Connector.............................................................................................................. 14
6.1.4 Peripheral Power Connectors............................................................................................................ 15
6.1.5 Floppy Power Connector ................................................................................................................... 15
6.1.6 Server Signal Connector.................................................................................................................... 15
6.2 Grounding.................................................................................................................................................. 16
6.3 Remote Sense .......................................................................................................................................... 16
6.4 Output Power/Currents ............................................................................................................................. 17
6.4.1 Standby Outputs ................................................................................................................................ 18
6.5 Voltage Regulation.................................................................................................................................... 19
6.6 Dynamic Loading ...................................................................................................................................... 20
6.7 Capacitive Loading.................................................................................................................................... 20
6.8 Ripple / Noise............................................................................................................................................ 21
6.9 Timing Requirements................................................................................................................................ 21
7 Protection Circuits...................................................................................................................................... 24
7.1 Current Limit.............................................................................................................................................. 24
7.2 240VA Protection ...................................................................................................................................... 24
7.3 Over Voltage Protection............................................................................................................................ 25
7.4 Over Temperature Protection.................................................................................................................... 25
8 Control and Indicator Functions............................................................................................................... 26
8.1 PSON# ...................................................................................................................................................... 26
8.2 PWOK (Power OK) ................................................................................................................................... 27
8.3 Field Replacement Unit (FRU) Signals..................................................................................................... 27
8.3.1 FRU Data........................................................................................................................................... 27
8.3.2 FRU Data Format............................................................................................................................... 28
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