Datasheet

7
4.1.6.SHORT CIRCUIT PROTECTION
Output short circuit is defined to be a short circuit load of less than 0.1 ohm.
In the event of an output short circuit condition on +3.3V, +5V or +12V output, the power supply
will shutdown and latch off without damage to the power supply. The power supply shall return to
normal operation after the short circuit has been removed and the power switch has been turned off
for no more than 2 seconds.
In the event of an output short circuit condition on –12V output, the power supply will not
be damaged. The power supply shall return to normal operation as soon as the short circuit has been
removed. and the power switch has been turned off for no more than 2 seconds.
4.1.7.OVERLOAD PROTECTION
Overload currents defined as a 10 amp/sec fault current ramp starting from full load, applied to the
+3.3V, +5V output, shall not cause that output to exceed 45 amps before the output voltage drops
below 0.5 volts and is latched off. The +12V1,+12V2 output shall not exceed 25 amps under
the same ramp conditions starting at full load before it is latched off.
The overload protection must be such that the power supply is protected from damage by entering a
shutdown condition.
4.1.8.POWER GOOD SIGNAL
The power good signal is a TTL compatible signal for the purpose of initiating an orderly star-up
procedure under normal input operating conditions. This signal is asserted (low) until +5Vdc has
reached 4.75 volts during power up. Characteristics:
TTL signal asserted (low state) : less than 0.5V while sinking 10mA.
TTL signal asserted (high state): greater than 4.75V while sourcing 500uA.
High state output impedance: less or equal to 1Kohm from output to common.
POWER GOOD @ 115/230V,FULL LOAD 100 –500mSec.
POWER FAIL @115/230V, FULL LOAD 1 mSec. minimum
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