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6/ Electrical Specification
Supply Voltage
1x ATX main power 24-pin
1x ATX power 8-pin
2x ATX peripheral power
Power Supply Rise time
There must be a smooth and continuous ramp of each DC input voltage from 10% to 90% of its final set-
point following the ATX specification
If any of the supply voltages drops below the allowed operating level longer than the
specified hold-up time, all the supply voltages should be shut down and left OFF for a time
long enough to allow the internal board voltages to discharge sufficiently.
If the OFF time is not observed, parts of the board or attached peripherals may work
incorrectly or even suffer a reduction of MTBF.
The minimum OFF time depends on the implemented PSU model and other electrical factors
and needs to be measured individually for each case.
Supply Voltage Tolerances
Supply voltage has to comply with ATX specification
To protect external power lines of peripheral devices, make sure that the wires have the right
diameter to withstand the maximum available current. The enclosure of the peripheral device
has to fulfill the fire-protection requirements of IEC/EN62368.
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