Spire SPECTRA 420W / SP-ATX-420W-E12 - Manual (Page 11)

Version:A/0 Page 11 of 17
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2.3.2 PS_ON#
The power supply provides an internal pull-up to TTL high. The power supply
also provides denounce circuitry on PS_ON# to prevent it from oscillating
on/off at startup when activated by a mechanical switch. The DC output enable
circuitry is SELV-complaint.
2.3.3 +5VSB
The +5VSB is capable of delivering a maximum of 2.5A at +5V ±5% to external
circuit. The power supply +5VSB is with overcurrent protection.
2.3.4 Power-on Time
The power-on time is less than 100ms (T1 < 100ms). The +5VSB has a
power-on time of two seconds maximum after application of valid AC
voltages. (Figure 1)
2.3.5 Rise time
The output voltages rise from ≤ 10% of nominal to within the regulation ranges
within 0.1ms to 25ms ( 0.1ms ≤ T2 ≤ 25ms). (Figure 2)
2.3.6 Overshoot at Turn-on / Turn-off
Any overshoot at turn on or turn off is under 10% of the nominal DC
output voltage with further stipulation that all DC outputs are within their
specified DC voltage ranges before the generation of the power good
signal. Additionally, no voltage may undershoot or overshoot once the
power good signal has been asserted.
2.3.7 Reset after Shutdown
The power supply latches into a shutdown state because of a fault condition
on its outputs, the power supply returns to normal operating after the fault
has been removed and the PS_ON# (or AC input) has been cycled OFF/ON
with a minimum OFF time of 1 second.
Min. Max.
V
IL
, Input Low Voltage 0.0V 0.8V
V
IL
, Input Low Current (Vin = 0.4 V) -1.6mA
V
IH
, Input High Voltage (lin = -200 μA) 2.0V
V
IH
, open circuit, lin = 0 5.25V
Table 8. PS_ON# Signal Characteristics