SilverStone ST40NF Manual - Manual (Page 6)

05
4.3 OUTPUT TRANSIENT LOAD RESPONSE
4.4. PS_ ON#
DC Output Transient Step Sizes
summarizes the expected output transient step sizes for each output. The
transient load slew rate is = 1.0 A/μs.
PS_ON# is an active-low, TTL-compatible signal that allows a motherboard to remotely
control the power supply in conjunction with features such as soft on/off, Wake on LAN+,
or wake-on-modem.When PS_ON# is pulled to TTL low, the power supply should turn on
the five main DC output rails: +12VDC,+5VDC,+3.3VDC,and –12VDC. When PS_ON# is
pulled to TTL high or open-circuited, the DC output rails should not deliver current and
should be held at zero potential with respect to ground. PS_ON# has no effect on the
+5VSB output, which is always enabled whenever the AC power is present. Table lists
PS_ON# signal characteristics. The power supply shall provide an internal pull-up to TTL
high. The power supply shall also provide debounce circuitry on PS_ON# to prevent it from
oscillating on/off at startup when activated by a mechanical switch. The DC output enable
circuitry must be SELV-compliant.
Load-changing repetition rate of 50 Hz to 10 kHz
Ac input range per section 3.1
Capacitive loading per section 4.5
Output Max . step size
(amps)
Max. setp size
(% of rated output amps per Sec 4.1.1)
+12VDC
+5VDC
+3.3VDC
-12VDC
+5VSB
50%
30%
30%
-
-
-
-
-
0.1A
0.5A
PS_ON# Signal Characteristics
Min. Max.
VIL, Input Low Voltage
IIL, Input Low Current (Vin = 0.4V)
VIH, Input High Voltage (lin = -200μA)
VIH OPEN circuit, lin = 0
0.0V
-
2.0V
-
0.8V
-1.6mA
-
5.25V
5. ENVIRONMENTAL REQUIREMENTS