+
R
C1
F1
FG
AC IN
FG
TFR1
CY
C3
C2
+BC
+S
-BC
-S
Cbc
AC1
AC2
+VOUT
-VOUT
TUNS300F
TUNS500F
TUNS700F
TUNS1200F
R
C
Load
C4
+
Co
50mm
Noise
filter
Oscilloscope
BW:100MHz
1.5m
50
W
Coaxial
Cable
R=50
W
C=0.01
m
F
C4 :
TUNS300F/500F/700F
12V 10
m
F
28V 4.7
m
F
48V 2.2
m
F
TUNS1200F
1.0
m
F
Fig.2.1 Method of Measuring Output Ripple and Ripple Noise
2.3 BC/-BC pins
(1) Cbc : Smoothing capacitor for boost voltage
¡
In order to smooth boost voltage, connect Cbc bBC and
-BC. Recommended capacitance of Cbc is shown in Table2.4.
¡
Note that +BC and -BC terminals have high voltage (DC380V typ).
¡
When the input voltage is AC264V or higher, the voltage between
+BC, R and -BC will rise to about 430V.
¡
Keep the capacitance within the allowable external capacitance.
¡
Select a capacitor of which the boost voltage ripple voltage does
not exceed 30Vp-p.
¡
When the power supply is operated under -20
C
, it may make
the boost voltage unstable due to the characteristic of equivalent
series resistor. Please choose the capacitor which has more than
recommended capacitance.
Table 2.4 Recommended capacitance Cbc
No.
Model
Voltage
Cbc
Allowable
capacitance range
1
TUNS300F
DC420V
or more
470μF
390 to 2200μF
2
TUNS500F
390μF
X
2
390 to 2200μF
3
TUNS700F
390μF
X
2
470 to 2200μF
4
TUNS1200F
(85 to 264Vin)
470μF
X
3
780 to 3300μF
5
TUNS1200F
(85 to 305Vin)
DC500V
or more
470μF
X
3
780 to 2200μF
(2) C2, C3 : Capacitor for boost voltage
¡
Install external capacitors C2, C3 with capacitance shown in table
2.5.
¡
If capacitors C2, C3 are not installed, it may cause the failure of
the power supply or external components.
Table 2.5 Recommended capacitance C2 and C3
No.
Model
Voltage
Capacitance
Rated ripple
current
1
TUNS300F
DC450V
or more
1μF or more
3A or more
2
TUNS500F
1μF or more
3A or more
3
TUNS700F
1μF or more
3A or more
4
TUNS1200F
(85 to 264Vin)
2μF or more
5A or more
5
TUNS1200F
(85 to 305Vin)
DC500V
or more
2μF or more
5A or more
(3) TFR1 : Inrush current limiting resistor 4.7ohm - 22ohm
¡
Connect a resistor between R pin and +BC pin for inrush cur-
rent protection. The surge capacity is required for TFR1, please
contact component mfg. Wirewound resistor with thermal cut-offs
type is required.
3 Function
3.1 Input voltage range
¿
TUNS300F/500F/700F
¡
The input voltage range is from 85 VAC to 264 VAC.
¡
In cases that conform with safety standard, input voltage range is
AC100-AC240V(50/60Hz).
¿
TUNS1200F
¡
The input voltage range is from 85 VAC to 305 VAC.
¡
In cases that conform with safety standard, input voltage range is
AC100-AC277V (50/60Hz).
Remarks:
Be aware that use of voltages other than those listed above may
result in the unit not operating according to specifications, or may
cause damage. Avoid square waveform input voltage, commonly
used in UPS and inverters.
3.2 Overcurrent protection
¿
TUNS300F/TUNS700F/TUNS1200
¡
Overcurrent protection is built-in and comes into effect over 105%
of the rated current.
Overcurrent protection prevents the unit from short circuit and
overcurrent condition. The unit automatically recovers when the
fault condition is cleared.
¡
When the output voltage drops at overcurrent, the average output
current is reduced by hiccup operation of power supply.
¿
TUNS500F
¡
Overcurrent protection is built-in and comes into effect over 101%
of the peak current.
Overcurrent protection prevents the unit from short circuit and
overcurrent condition. The unit automatically recovers when the
fault condition is cleared.
¡
When the output voltage drops at overcurrent, the average output
current is reduced by hiccup operation of power supply.
3.3 Peak current protection
¿
TUNS500F
¡
Peak current protection is built-in. When the power supply is oper-
ated over peak load based on section 7 (Peak current), this func-
tion comes into effect and reduce the output.
¡
A few seconds later, a unit automatically recovers. But if the over-
current condition has not been released, the output will reduced
again (hiccup operation mode).
TUNS300F, TUNS500F, TUNS700F, TUNS1200F
AC-DC Power Supplies Bus Converter.Power Module Type
Instruction Manual
TUNS-24
July 27, 2020
