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 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.
niard/rotcelloc nepo na stpeccA epyT langiS
input from the system. Pull-up to
VSB locted in power supply.
NO rewoP woL = #NOSP
FFO rewoP hgiH = #NOSP
Table 13 – PWOK Signal Characteristic
3.5 Efficiency
The efficiency is specified at 50% and 20% loading conditions to help reduce system power
consumption at typical system loading conditions.
.
Loading 100% of
maximum
50% of maximum 20% of maximum
Minimum 80% 83% 81%
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 4A for PC board circuit to operate.
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 Current Protection
This power supply shall have current limit to prevent the +5V, +3.3V, and +12V outputs from
exceeding the values shown in table 14. The current limit shall not trip under maximum continuous
load or peak loading as described in Table 5. The power supply shall latch off if the current exceeds
the limit. 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. The -12V and
+5VSB outputs shall be shorted circuit protected so that no damage can occur to the power supply.
Voltage Minimum Maximum Shutdown Mode
+5V 110% 160% Latch Off
+3.3V 110% 160% Latch Off
+12V 110% 160% Latch Off
Table 14 –Over Current protection
4.2 Over Voltage Protection
The power supply shall shut down in a latch off mode when the output voltage exceeds the over
voltage limit shown in Table 15.
8
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