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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