Power consumption on Voyager motherboard

 American Megatrends, Inc.

Tech Tip #12.001

02/14/91


Problem:


Power consumption on Voyager motherboard.


+5V Current Limitation.


The Power Connector on the motherboard has 4 +5V connections, each

of these is rated at 5amps of continuous current.  The maximum

current that can be drawn on the Voyager at +5V is 20amps.


EISA/ISA Specifications:


Maximum current that can be drawn on 1 I/O slot is 4.5amps at +5V.

So, The maximum current that can be drawn on an EISA/ISA board is

equal to:


8 X 4.5amps = 36amps max.


Of this amount, the motherboard draws about 5 - 7 amps on +5V,

fully loaded condition.

Therefore on current Voyager boards, the max current available for

I/O cards is about 13 - 14 amps.



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