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ERP2U Power Supply Design Guide, V2.31
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Contents
1 Purpose.......................................................................................................................................................... 7
2 Conceptual Overview ................................................................................................................................... 7
3 Definitions/Terms/Acronyms....................................................................................................................... 8
4 Mechanical Overview ................................................................................................................................... 9
4.1 Acoustic Requirements ............................................................................................................................. 10
4.2 Airflow Requirements................................................................................................................................ 10
4.3 Temperature Requirements ...................................................................................................................... 10
5 AC Input Requirements.............................................................................................................................. 11
5.1 AC Inlet Connector.................................................................................................................................... 11
5.2 Redundant AC Inlets................................................................................................................................. 11
5.3 AC Input Voltage Specification ................................................................................................................. 11
5.4 Input Under Voltage .................................................................................................................................. 12
5.5 Efficiency................................................................................................................................................... 12
5.6 AC Line Dropout........................................................................................................................................ 12
5.7 AC Line Fuse ............................................................................................................................................ 13
5.8 AC Inrush .................................................................................................................................................. 13
5.9 AC Line Transient Specification................................................................................................................ 13
5.10 AC Line Fast Transient Specification .................................................................................................... 14
6 DC Output Specification ............................................................................................................................ 15
6.1 Output Connectors.................................................................................................................................... 15
6.1.1 Required Baseboard power connector ..............................................................................................15
6.1.2 +12V4 Baseboard Power Connector .................................................................................................16
6.1.3 Required Peripheral Power Connectors ............................................................................................16
6.1.4 Required Floppy Power Connector.................................................................................................... 16
6.1.5 Serial ATA Power Connector............................................................................................................. 17
6.1.6 Server Signal Connector.................................................................................................................... 17
6.2 Grounding.................................................................................................................................................. 18
6.3 Remote Sense .......................................................................................................................................... 18
6.4 Output Power/Currents ............................................................................................................................. 18
6.4.1 Standby Outputs ................................................................................................................................ 21
6.4.2 Fan operation in standby mode ......................................................................................................... 21
6.5 Voltage Regulation.................................................................................................................................... 21
6.6 Dynamic Loading ...................................................................................................................................... 22
6.7 Capacitive Loading.................................................................................................................................... 22
6.8 Ripple / Noise............................................................................................................................................ 23
6.9 Redundancy .............................................................................................................................................. 24
6.10 Hot Swap Requirements........................................................................................................................ 24
6.11 Timing Requirements ............................................................................................................................ 25
7 Protection Circuits...................................................................................................................................... 28
7.1 Current Limit.............................................................................................................................................. 28
7.2 240VA Protection ...................................................................................................................................... 28
7.3 Over Voltage Protection............................................................................................................................ 29
7.4 Over Temperature Protection.................................................................................................................... 29
8 Control and Indicator Functions ............................................................................................................... 30
8.1 PSON# ...................................................................................................................................................... 30
8.2 PWOK (Power OK) ................................................................................................................................... 31
8.3 SMBus Communication............................................................................................................................. 31