SSI
EPS1U Power Supply Design Guide, V1.1
Contents
1
Purpose .......................................................................................................................................................... 5
2
Conceptual Overview.................................................................................................................................... 5
3
Definitions/Terms/Acronyms ....................................................................................................................... 6
4
Mechanical Overview .................................................................................................................................... 7
4.1
High Power Card Edge Form Factor ................................................................................................... 7
4.2
Alternate Enclosure ............................................................................................................................. 8
4.3
Airflow Requirements .......................................................................................................................... 9
4.4
Temperature Requirements ................................................................................................................ 9
5
AC Input Requirements .............................................................................................................................. 10
5.1
AC Inlet Connector ............................................................................................................................ 10
5.2
AC Input Voltage Specification.......................................................................................................... 10
5.3
Input Under Voltage .......................................................................................................................... 10
5.4
Efficiency ........................................................................................................................................... 11
5.5
AC Line Dropout ................................................................................................................................ 11
5.6
AC Line Fuse..................................................................................................................................... 11
5.7
AC Inrush........................................................................................................................................... 11
5.8
AC Line Transient Specification ........................................................................................................ 12
5.9
AC Line Fast Transient Specification ................................................................................................ 12
6
DC Output Specification ............................................................................................................................. 13
6.1
Connector .......................................................................................................................................... 13
6.2
Grounding.......................................................................................................................................... 15
6.3
Remote Sense................................................................................................................................... 15
6.4
Output Power/Currents...................................................................................................................... 15
6.4.1
Standby Outputs ................................................................................................................... 17
6.5
Voltage Regulation ............................................................................................................................ 18
6.6
Dynamic Loading............................................................................................................................... 18
6.7
Capacitive Loading ............................................................................................................................ 19
6.8
Ripple / Noise .................................................................................................................................... 19
6.9
Timing Requirements ........................................................................................................................ 20
7
Protection Circuits ...................................................................................................................................... 23
7.1
Current Limit ...................................................................................................................................... 23
7.2
240VA Protection .............................................................................................................................. 23
7.3
Over Voltage Protection .................................................................................................................... 24
7.4
Over Temperature Protection............................................................................................................ 24
8
Control and Indicator Functions................................................................................................................ 25
8.1
PSON
#
............................................................................................................................................... 25
8.2
PWOK (Power OK)............................................................................................................................ 26
8.3
ACWarning ........................................................................................................................................ 27
8.4
Field Replacement Unit (FRU) Signals ............................................................................................. 28
8.4.1
FRU Data .............................................................................................................................. 28
8.4.2
FRU Data Format.................................................................................................................. 28
8.5
LED Indicator..................................................................................................................................... 30