SilverStone ST45NF [8/15] Nj450 manual 7

+5VSB

Figure 2 : Turn On/Off Timing

3.6. Power Good Signal : PWOK

PWOK 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 deserted 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 = 200uA

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 MAX

0.4V

2.4V

5.25V

4mA

2mA

100mSec 500mSec

200mSec

100uSec

2mSec

Table 12 - PWOK Signal Characteristics