SilverStone ST46GF Manual - Manual (Page 7)

ST46GF
06
3.4 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,-5V and -12V power rails. When this signal is not pulled
low by the system, or left open, the outputs (except the +5VSB and V bias) turn off. This signal is
pulled to a standby voltage by a pull-up resistor internal to the power supply.
3.5 Efficiency
The efficiency is 68% at full loading condition to help reduce system power consumption at
typical system loading conditions.
3.6 +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 2A for PC board circuit to operate.
Table 6 – PWOK Signal Characteristic
Signal Type
PSON# = Low
PSON# = High
Power ON
Power OFF
Accepts an open collector/drain input from the system. Pull-up to VSB located
in power supply.
4. Protection
Protection circuits inside the power supply shall cause only the power supply’s main outputs to shutdown.
If the power supply latches off due to a protection circuit tripping, either a AC cycle OFF for 15 sec, or
PSON# cycle HIGH for 1 sec must be able to restart the power supply.
4.1 Over Power Protection
The OPP function shall work at 130%~270% of rating of output power (when optional external
protect card is not present), then all outputs shut down in a latch off mode.
The latch shall be cleared by toggling the PSON# signal or by cycling the AC power.
The power supply shall not be damaged from repeated 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.
4.2 Over Voltage Protection
Each hot swap module has respective OVP circuit. Once any power supply module shut down in
a latch off mode while the output voltage exceeds the over voltage limit shown in Table 7, the other
modules should deliver the sufficient power to the device continually.