SilverStone SST-ST46GF(V3) [7/12] St46gf

ST46GF

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.