3.4 Overvoltage protection
¡
Overvoltage protection circuit is built-in. If the overvoltage protec-
tion circuit is activated, shut down the input voltage, wait a certain
time and turn on the AC input again to recover the output voltage.
The recovery time is 3 minutes or more for TUNS300F/500F/700F,
and 10 seconds or more for TUNS1200F. However, it varies de-
pending on such factors as input voltage value at the time of the
operation.
Remarks:
Please note that devices inside the power supply might fail when
voltage of more than rated output voltage is applied to output ter-
minal of the power supply. This could happen when the customer
tests the overvoltage performance of the unit.
3.5 Thermal protection
¡
When it exceeds the Derating, the thermal protection will be acti-
vated and simultaneously shut down the output.
When the thermal protection is activated, shut off the input voltage
and eliminate all the overheating conditions. To recover the output
voltage, keep enough time to cool down the power supply before
turning on the input voltage again.
3.6 Remote ON/OFF
¿
TUNS300F/500F/700F
¡
Remote ON/OFF is not built-in.
¿
TUNS1200F
¡
Remote ON/OFF is built-in
¡
Remote ON/OFF is possible by applying a voltage between RC1
and RC2 pin.
¡
When power supply shut off by over voltage protection or thermal
protection, it can be recovered by toggling Remote ON/OFF
signal.
¡
Remote ON/OFF circuit (RC1, RC2) is isolated from input, output,
FG, AUX and various function terminals.
¡
Sink current of RC1 must be kept up to 12mA.
Table 3.1 Remote ON/OFF connection
No.
ITEM
RC1,RC2
1
Connection
method
Fig.3.1 (a)
Fig.3.1 (b)
Fig.3.1 (c)
2
Function
Output is ON in “L”
3
Isolation
INPUT - RC INPUT - RC
OUTPUT - RC INPUT - RC
4
Base pin
-S
RC2
-S, RC2
5
Output ON
SW OPEN
(0.1mA max)
SW SHORT
(0.5V max)
6
Output OFF
SW SHORT
(2mA min)
SW OPEN
(0.1mA max)
(c)
(a)
(b)
ON
POWER
RC2
RC1
AUX
OFF
-S
typ
12V
150Ω
1.1kΩ
ON
POWER
RC2
RC1
AUX
OFF
-S
typ
12V
150Ω
1.1kΩ
typ
12V
150Ω
1.1kΩ
ON
POWER
RC2
RC1 Rrc
V1
AUX
OFF
-S
Fig.3.1 Examples of connecting remote ON/OFF circuit
¿
-R1 (TUNS300F/500F/700F)
¡
Remote ON/OFF is possible by applying a voltage between RC1
and RC2 pin. External DC power source is necessary to operate
remote control.
External current limiting resistor Rrc is necessary.
¡
When power supply shut off by over voltage protection or
overheating protection, it can be recovered by toggling Remote
ON/OFF signal.
Table .3.2 Remote ON/OFF connection specification
No.
ITEM
RC1, RC2
1
Function
Output is ON in “L”
2
Base pin
RC2
3
Output ON
SW OPEN
(0.5V max, 0.1mA max)
4
Output OFF
SW SHORT
(5mA typ, 3mA min)
¡
Sink current of RC1 must be kept up to 12mA.
RC1
150
RC2
12mA max
Rrc
OUTSIDE OF TUNS INSIDE OF TUNS
Vrc
SW
Vf
N
1.0V
Fig .3.2 RC Connection Example
*
Please be careful not to connect RC1 and RC2 opposite.
It may cause a failure of power supply.
¡
Remote ON/OFF circuit (RC1, RC2) is isolated from the input and
output and FG.
¿
-R2 (TUNS300F/500F/700F)
¡
”-R2” can reduce standby power than “-R1”.
¡
The usage is same as option “-R1”.
Please refer to option “-R1”
■Standby power
0.5Wtyp (AC100V), 1.2Wtyp (AC200V)
3.7 AUX for Remote ON/OFF circuit
¿
TUNS1200F
¡
The AUX can be used as the power source for Remote ON/OFF
circuit.
¡
AUX is designed as shown in Fig.3.3, and a resistor (1.1kΩ ) is
built in to protect the short circuit.Output voltage decreases as the
output current increases.
12V typ
1.1kΩ
AUX
-S
Fig.3.3 AUX circuit
AC-DC Power Supplies Bus Converter.Power Module Type TUNS300F, TUNS500F, TUNS700F, TUNS1200F
Instruction Manual
TUNS-25
July 27, 2020
