Datasheet

Description:
Electrical Specification
SilverStone Technology Co., Ltd.
Subject:
SilverStone Technology
Model: ST85ZF
Switching Power Supply
Document No.:
ES-850-ZEUS-01
File Name: ST85ZF.doc Page : 7
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 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
PWOK down delay : Tpwok_off 2mSec 200mSec
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 locted
in power supply.
PSON# = Low Power ON
PSON# = Open Power OFF
MIN MAX
Logic level low (Power supply ON) 0V 1.0V
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