Power Good Signal
When the power supply
is
turned
on
after it has been off for a
minimum
of
5 seconds, it generates a 'power good' signal that
indicates there
is
adequate power for processing. When the four
r""\
output voltages are above the minimum sense levels, as described
below, the signal sequences to a TTL-compatible up level (2.4
Vdc to 5.5 Vdc),
is
capable of sourcing
60
/LA.
When any of the
four output voltages
is
below its minimum sense level or above its
maximum sense level, the 'power good' signal will be
TTL-compatible down level (0.0 Vdc to 0.4 Vdc) capable of
supplying 500
/LA.
The 'power good' signal has a turn-on delay of
100-ms after the output voltages have reached their respective
minimum sense levels.
Output
Under-Voltage Over-Voltage
Voltage
Nominal Sense Level Nominal Sense Level
+5Vdc
+4.0Vdc
+ 5.9 Vdc
-5Vdc
-4.0Vdc
-
5.9
Vdc
+
12
Vdc
+9.6Vdc
+14.2Vdc
-12
Vdc
-9.6Vdc
-14.2
Vdc
Power Supply Connectors and Pin
Assignments
The power connector on the system board
is
a 12-pin male
connector
that
plugs into the power-supply connectors. The pin
configuration and locations follow.
3-6
Power Supply
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