SSI
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
