SilverStone ST55GF Manual - Manual (Page 9)

ST55GF
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.
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
] 68%, 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 on. The +5VSB line is capable of delivering at a maximum of 2.0A for PC
board circuit to operate.
4. Protection
The OPP function shall work at 130%~270% of rating of output power (when optional
external protectcard is not present), then all outputs shut down in a latch off mode. The latch
shall be cleared bytoggling the PSON# signal or by cycling the AC power. The power
supply shall not be damaged fromrepeated power cycling in this condition. If only one
module works inside the power supply, the OPP is at 110%~170% of rating of power supply.
Signal
Accepts an open collector/drain input 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)
Logic level low (Power supply OFF)
0V
2.4V
Source current, Vpson = Low
Power up delay: Tpson_on_delay
0.8V
5.25V
4mA
50mSec
400mSec
5mSec
PWOK delay : Tpson_pwok
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