iStarUSA IS-1800RH1UP User Manual
6
AC Input AC Off AC On
T
vout_holdup
Vout
T
ac_on-delay
T
pwok_low
Tsb_on-delay
T
pwok_off
T
pwok_off
PWOK T
pwok_on
T
pwok_holdup
T
sb_on-delay
T
pwok_on
T
pson_pwok
+5VSB T
sb_vout
T
sb_holdup
Min.>70mS
T
pson_on_delay
PSON#
AC
turn 0n/off cycle
PSON
turn on/off cycle
Figure 2 : Turn On/Off Timing
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.
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.
n
i
a
r
d
/
r
o
t
c
e
l
l
o
c
n
e
p
o
n
a
s
t
p
e
c
c
A
e
p
y
T
l
a
n
g
i
S
input from the system. Pull-up to
VSB located in power supply.
VSB located in power supply.
N
O
r
e
w
o
P
w
o
L
=
#
N
O
S
P
F
F
O
r
e
w
o
P
h
g
i
H
=
#
N
O
S
P
Table 6 – PWOK Signal Characteristic
3.5 Efficiency
The efficiency is
ʁ 75% 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 3A for PC board circuit to operate.
on.
The +5VSB line is capable of delivering at a maximum of 3A 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.
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.