Silverstone SST-ST30NF-V4.1 用户手册
3.6 Power Good Signal: PWOK
PSOK is a power OK signal and will be pulled HIGH by the power supply to indicate that all
the outputs are within the regulation limits of the power supply. When any output voltage
falls below regulation limits or when AC power has been removed for a time sufficiently
long so that power supply operation is no longer guaranteed, PWOK will be deasserted to a
LOW state. See for a representation of the timing characteristics of PWOK. The start of
PWOK delay time shall inhibited as long as any power supply output is in current limit.
PSOK is a power OK signal and will be pulled HIGH by the power supply to indicate that all
the outputs are within the regulation limits of the power supply. When any output voltage
falls below regulation limits or when AC power has been removed for a time sufficiently
long so that power supply operation is no longer guaranteed, PWOK will be deasserted to a
LOW state. See for a representation of the timing characteristics of PWOK. The start of
PWOK delay time shall inhibited as long as any power supply output is in current limit.
Signal Type
Open collector/drain output from power supply.
Pull-up to VSB located in power supply
Pull-up to VSB located in power supply
PWOK = High
Power OK
PWOK = Low
Power is not OK
MIN
MAX
Logic level low voltage, Isink = 4mA
0V
0.4V
Logic level high voltage, Isource = 200μA
2.4V 5.25V
Sink current, PWOK = Low
4mA
Source current, PWOK = High
2mA
PWOK delay: Tpwok_on
100mSec
1000mSec
PWOK rise and fall time
100μSec
Table 12 – PWOK Signal Characteristics
3.7 Remote On/Off Control : PSON#
The PSON# signal is required to remotely turn on/off the power supply. PSON# is an active
low signal that turns on the +5V, +3.3V, +12V and –12V power rails. When this signal is not
pulled low by the system, or left open, the outputs(except the +5VSB and Vbias) turn off.
This signal is pulled to a standby voltage by a pull-up resistor internal to the power supply.
Signal Type
Accepts an open collector/drain input
from the system. Pull-up to VSB
located in power supply.
from the system. Pull-up to VSB
located in power supply.
PSON# = Low
Power ON
PSON# = Open
Power OFF
MIN
MAX
Logic level low (Power supply ON)
0V
0.8V
Logic level low (Power supply OFF)
2.0V
5.25V
Source current, Vpson = Low
4mA
Power up delay: Tpson_on_delay
5mSec
400mSec
PWOK delay: Tpson_pwok
50mSec
Table 13 – PWOK Signal Characteristics
3.8 Overshoot at Turn-on /Turn-off
Any output overshoot at turn on shall be less than 10% of the nominal output value. Any
overshoot shall recover to within regulation in less than 10ms.
3.9 Efficiency
The minimum power supply system efficiency shall be
Any output overshoot at turn on shall be less than 10% of the nominal output value. Any
overshoot shall recover to within regulation in less than 10ms.
3.9 Efficiency
The minimum power supply system efficiency shall be
≥ 70%, measured at nominal input
voltage 115 V or 230 V and full loading.
3.10 +5VSB (Standby)
The +5VSB output is always on (+5V Standby) when AC power is applied and power switch
is turned
3.10 +5VSB (Standby)
The +5VSB output is always on (+5V Standby) when AC power is applied and power switch
is turned
on. The +5VSB line is capable of delivering at a maximum of
1.5
A for PC board
circuit to operate.