SilverStone ST75ZF [8/16] St75zf manual 08

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.

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.

Signal Type

Open collector/drain output from power supply.

Pull-up to VSB located in power supply.

PWOK = High

PWOK = Low

Logic level low voltage, Isink = 4mA

Logic level high voltage, Isource = 200μA

Sink current, PWOK = Low

Source current, PWOK = High

PWOK delay: Tpwok_on

PWOK rise and fall time

PWOK down delay : Tpwok_off

Power OK

Power is Not OK

MIN

2.4V

100mSec

2mSec

MAX

0.4V

5.25V

4mA

2mA

1000mSec

100μSec

200mSec

Table 12 - PWOK Signal Characteristics