Cosel TUNS1200F Series Instructions for use

2021/11/22
Rev. 1.1E
Application manual
TUNS1200F

Applications Manual for TUNS1200
1. Pin Assignment
Pin Assignment
2. Connection for Standard Use
Connection for standard use
Input fuse ：F11
Input capacitor
：C11
Y capacitors and noise filters ：CY,CX,L11,L12
Output capacitors ：
Co,C40
Smoothing capacitor for boost voltage ：Cbc
Capacitor for boost voltage ：C20,C30
Inrush current limiting resistor ：TFR1
Discharging resistor
：R1
3. Holdup time
Input voltage characteristics of boosted voltage
Holdup time
4. Operation under low temperature conditions
Ripple voltage of boost voltage
5. Parallel operation A-11
Wiring for parallel operation A-11
Output voltage adjustment in parallel operation(CV) A-12
Constant current adjustment in parallel operation(CC)
N+1 redundant operation
Remote control
6. Other functions
Power good
7. Mounting method
Mounting method
8. Board layout
Consideration for board layout
Reference PCB layout
9. Thermal Design
Thermal Design
Examples of Convection cooling
Examples of Forced air cooling
Note：
Information contained in this document is subject to change without notice for improvement.
The materials are intended as a reference design, component values and circuit examples
described in this document varies depending on operating conditions and component variations.
Please select the components and design under consideration of usage condition etc.
A-23
9.1
9.2
9.3
A-23
A-23
A-24
A-18
8.2
Contents
1.1
2.2
A-1
A-8
A-18
4.1
Page
2.4
A-4
2.5
A-4
A-5
A-9
A-9
3.2
6.1
A-16
A-1
8.1
2.9
A-7
2.8
A-7
A-8
2.6
2.7
A-13
A-16
A-8
A-22
5.2
5.3
A-17
A-17
5.4
7.1
A-2
A-3
2.1
A-2
2.3
A-3
3.1
5.5
5.1
A-6
A-14
A-15

Fig.1.1
Pin Assignment
Table 1.1
Pin configuration
and function
1.1 Pin Assignment
⑩
⑪
-DC output
Remote sensing(-)
Remote sensing(+)
Current balance
A-1
RC2
PGG
ITRM
VTRM
AUX
AC2
R
+BC
-BC
+VOUT
-VOUT
+S
-S
CB
-
Mounting hole(FG)
Remote ON/OFF
Alarm
②
RC1
PG
FG
⑫
⑬
⑭
⑮
⑯
⑰
⑲
No.
①
Function
AC input
External resistor for inrush current protection
+BC output
-BC output
+DC output
③
④
⑤
⑥⑦
⑧⑨
Pin
Connection
AC1
Remote ON/OFF ground
Alarm ground
Adjustment of output current
Adjustment of output voltage
Auxiliary output for remote ON/OFF
⑱
Applications Manual
TUNS1200
2.1 Pin configuration
1. Pin Assignment
-VOUT
+VOUT
③R
⑭PGG⑲PG
⑬RC2⑱RC1
⑫CB⑰AUX
⑪-S⑯VTRM
⑩+S⑮ITRM
①AC1
②AC2
④+BC ⑤-BC
⑨
⑧
⑦
⑥
Bottom view
4-FG

2.1 Connection for standard use
■To use the TUNS1200 series, external components should be connected as shown in Fig.2.1.
■The TUNS1200 series should be conduction-cooled. Use a heatsink or fan to dissipate heat.
Fig.2.1
Connection for
standard use
Table 2.1
Components list
・External parts should be changed according to the ambient temperature, and input and
output conditions.
For details, refer to the selection method of individual parts.
A-2
Applications Manual
TUNS1200
2.1 Pin configuration
2. Connection for Standard Use
Heatsink
Rating Part name Rating Part name
1F11 AC250V/25A
0325025
(Littelfuse) AC500V/25A 0505025 (Littelfuse)
2F12 AC250V/25A
0325025
(Littelfuse) AC500V/25A 0505025 (Littelfuse)
For medical standard
application
3C11
AC310V/1.5uF
×2parallel
LE155-MX × 2parallel
(OKAYA ELECTRIC INDUSTRIES)
AC310V/1.5uF
×2parallel
LE155-MX × 2parallel
(OKAYA ELECTRIC INDUSTRIES)
4CY1
AC400V
/2200pF
CD45-E2GA222M
(TDK)
AC400V
/2200pF
CD45-E2GA222M
(TDK)
5L11 0.8mH/20A
SCR25-200-1R7A008JH
(TOKIN) 2.4mH/15A SCR25B-150-1R4A024J (TOKIN)
6L12 3.5mH/15A
SC15-E350H
(TOKIN) 2.4mH/15A SCR25B-150-1R4A024J (TOKIN)
7CX1
AC310V/1.5uF
LE155-MX
(OKAYA ELECTRIC INDUSTRIES)
AC310V/1.5uF
LE155-MX
(OKAYA ELECTRIC INDUSTRIES)
8CX2
AC310V/1.5uF
LE155-MX
(OKAYA ELECTRIC INDUSTRIES)
AC310V/1.5uF
LE155-MX
(OKAYA ELECTRIC INDUSTRIES)
9CY2 AC400V/1500pF
CD45-E2GA152M
(TDK) AC400V/1500pF CD45-E2GA152M (TDK)
10 CY3 AC400V/1500pF
CD45-E2GA152M
(TDK) AC400V/1500pF CD45-E2GA152M (TDK)
F12 DC25V/2200uF
ELXZ250ELL222
(Nippon Chemi-Con) DC25V/2200uF ELXZ250ELL222 (Nippon Chemi-Con)
F28 DC50V/1000uF
ELXZ500ELL102
(Nippon Chemi-Con) DC50V/1000uF ELXZ500ELL102 (Nippon Chemi-Con)
F48 DC63V/470uF
ELXZ630ELL471
(Nippon Chemi-Con) DC63V/470uF ELXZ630ELL471 (Nippon Chemi-Con)
F12 DC50V/1uF
C3216X7R1H105
(TDK) DC50V/1uF C3216X7R1H105 (TDK)
F28 DC50V/1uF
C3216X7R1H105
(TDK) DC50V/1uF C3216X7R1H105 (TDK)
F48 DC100V/1uF
C3216X7R2A105
(TDK) DC100V/1uF C3216X7R2A105 (TDK)
13 Cbc
DC450V/470uF
×3parallel
ELXS451VSN471 × 3parallel
(Nippon Chemi-Con)
DC500V/470uF
×3parallel
ELXS501VSN471 × 3parallel
(Nippon Chemi-Con)
14 C20
DC450V/1.0uF
×2parallel
ECWFE2W105JA × 2parallel
(Panasonic Electronic Components)
DC630V/1.0uF
×2parallel
ECWFE2J105JA × 2parallel
(Panasonic Electronic Components)
15 C30
DC450V/1.0uF
×2parallel
ECWFE2W105JA × 2parallel
(Panasonic Electronic Components)
DC630V/1.0uF
×2parallel
ECWFE2J105JA × 2parallel
(Panasonic Electronic Components)
16 TFR1 5.1Ω×2series
A5MC-5R1JK ×2series
(UCHIBASHI ESTEC)
5.1Ω×2series
A5MC-5R1JK ×2series
(UCHIBASHI ESTEC)
17 R1
68kΩ
×3series x 2parallel
CRS32 683
(HOKURIKU ELECTRIC INDUSTRY)
68kΩ
×3series x 2parallel
CRS32 683
(HOKURIKU ELECTRIC INDUSTRY)
18
SK11
SK21
SK22
620V
TND14V-621K
(Nippon Chemi-Con) 620V TND14V-621K (Nippon Chemi-Con)
19 SA11 4kV
DSA-402MA
(Mitsubishi Materials) 4kV DSA-402MA (Mitsubishi Materials)
No.
Symbol
Item
Vin = 85～264VAC
Vin = 85～305VAC
Note
Input fuse
Input capacitor
Y capacitor
Noise
filter
AC Line
filter
X capacitor
Y capacitor
11
Co
Output
capacitor
12
C40
Bypass
capacitor
Varistor
Surge absorber
Smoothing
capacitor
Capacitor
for boost voltage
Capacitor
for boost voltage
Inrush current
protection resistor
Discharging
resistor

■Fuse is not build-in on input side. In order to protect the unit, install a fuse
shown in Table 2.2 in the input circuit.
(as shown in Table 2.2)
■When applying for the medical electrical equipment standard, please install F11 and F12.
Table 2.2
Recommended
fuse
■Install a film capacitor of 3μF or higher as input capacitor C11.
■Use a safety approved capacitor.
■If C11 is not connected, that may cause failure of the power supply or external components.
■When selecting a capacitor, check the maximum allowable ripple current.
■Ripple current includes low frequency component (input frequency) and high frequency
component (100kHz).
■Ripple current values flowing into C11 as listed in Table 2.1 are shown in Fig.2.2.
■The ripple current changes with PCB patterns, external parts, ambient temperature, etc.
Check the actual ripple current value flowing through C11.
Fig.2.2
Ripple current
values
C11
※Ripple current value is the sum of parallel capacitors.
2.2 Input fuse: F11,F12
2.3 Input capacitor: C11
A-3
Rated current
85 ～264VAC
AC250V以上
25A
Input voltage
range
85 ～305VAC
AC300V以上
25A
Rated Voltage
Applications Manual
TUNS1200
0
500
1000
1500
2000
2500
020 40 60 80 100 120
Ripple current［mArms］
Output current ［%］
100VAC
200VAC
277VAC

■The TUNS1200 doesn't have noise filter internally
Install an external noise filter and capacitor (CY) to reduce conducted noise and stabilize
the operation of the power supply.
■Noise filters should be properly designed when the unit must conform to the EMI/EMS
standards or when surge voltage may be applied to the unit.
■Install the primary Y capacitor (CY1) as close as possible to the input pins (within 50 mm
from the pins).
A capacitance of 470 pF or more is required.
■When the total capacitance of CYs exceeds 8,800 pF, input-output withstanding voltage
may be dropped. In this case, either reduce the capacitance of Y capacitors or install a
grounding capacitor between output and FG.
■Use capacitors that comply with safety standards as CY.
■Install an external capacitor, Co, between +VOUT and -VOUT pins for stable operation
of the power supply. Recommended capacitance of Co is shown in Table 2.3.
■Use low impedance electrolytic capacitors with excellent temperature characteristics.
■When Using at ambient temperatures below 0 ºC, the output ripple voltage increases due
to the characteristics of equivalent series resistor (ESR). In this case, connect three
capacitors, Co, of recommended capacitance in parallel connection.
■Specifications, output ripple and ripple noise as evaluation data values are measured
according to Fig.2.3.
Table 2.3
Recommended
capacitance
Co
Fig.2.3
Measuring
environment
2.4 Y Capacitors and noise filters: CY, CX, L11, L12
2.5 Output capacitors: Co, C40
A-4
Output Voltage
12V
28V
48V
Tc = 0～100℃
470uＦ×3parallel
2,200uＦ
1,000uＦ
470uＦ
Tc = -40～100℃
2,200uＦ×3parallel
1,000uＦ×3parallel
Applications Manual
TUNS1200
R=50Ω
C=0.01uF
Load
1.5m 50Ω
Coaxial Cable
C40:
12V 10μF
28V 4.7μF
48V 2.2μF
+VOUT
-VOUT
-S
+S
0
0
0
0
Co
+
C40
50mm
Oscilloscope
BW:100MHz
R
C
C40=1.0uF

■In order to smooth boost voltage, connect Cbc between +BC and -BC.
Recommended capacitance of Cbc is shown in Table 2.4.
■If the capacity is not within the allowable external capacity, the module may be damaged.
■When operated below 0ºC, operation may become unstable as boost ripple voltage
increases due to ESR characteristics. Choose a capacitor which has higher capacitance
than recommended.
Select a capacitor so that the ripple voltage of the boost voltage is 30 Vp-p or below.
■If the ripple voltage of the boost voltage increases, the ripple current rating of the
smoothing capacitor may be exceeded. Check the maximum allowable ripple current of
the capacitor.
■The ripple current changes with PCB patterns, external parts, ambient temperature, etc.
Check the actual ripple current value flowing through Cbc.
■The boost voltage varies depending on the input voltage. (See item 3.1)
Table 2.4
Recommended
capacitance
Cbc
※ Refer to item 3 and 4 for selection method of Cbc.
Fig.2.4
Ripple current
values
Cbc
※Ripple current value is the sum of parallel capacitors.
2.6 Smoothing capacitor for boost voltage: Cbc
780uＦ ～ 3,300uF
780uＦ ～ 2,200uF
A-5
470uF×3 parallel
85 ～305VAC
DC500V以上
85 ～264VAC
DC420V以上
470uF×3 parallel
Allowable
capacitance range
Rated voltage
Input voltage
range
Recommended
capacitor
Applications Manual
TUNS1200
0
1000
2000
3000
4000
5000
6000
7000
020 40 60 80 100 120
Ripple current［mArms］
Output current ［%］
100VAC
200VAC
277VAC

■Install a film capacitor of 2uF or more into C20 and C30.
■If C20 and C30 are not connected, the power supply or external components could be
damaged.
■Ripple current flows in. Check the maximum allowable ripple current of the capacitor
when selecting. The frequency of the ripple current is 100 kHz to 200 kHz.
■Ripple current values flowing into C20 and C30 as listed in Table 2.1 are shown in
Fig.2.5 and Fig.2.6.
■The ripple current changes with PCB patterns, external parts, ambient temperature, etc.
Check the actual ripple current values flowing through C20 and C30.
■The boost voltage varies depending on the input voltage. (See item 3.1)
Fig.2.5
Ripple current
values
C20
※Ripple current value is the sum of parallel capacitors.
Fig.2.6
Ripple current
values
C30
※Ripple current value is the sum of parallel capacitors.
2.7 Capacitor for boost voltage :C20,C30
A-6
Applications Manual
TUNS1200
0
500
1000
1500
2000
2500
3000
3500
020 40 60 80 100 120
Ripple current［mArms］
Output current ［%］
100VAC
200VAC
277VAC
0
500
1000
1500
2000
2500
3000
3500
020 40 60 80 100 120
Ripple current［mArms］
Output current ［%］
100VAC
200VAC
277VAC

■Install inrush current limiting resistor(TFR1) between R terminal and +BC terminal.
■If TFR1 is not connected, the power supply will not work.
■The surge capacity is required for TFR1.
■Wirewound resistor with thermal cut-offs type is required.
■Inrush current limiting resistor can be used to limit the primary inrush current. However,
the secondary inrush current can’t be limited by increasing the resistor value of inrush
current limiting resistor. The secondary inrush current is approx. 25 ~ 30A.
Therefore, we don’t recommend connecting a large resistance as TFR1.
■The inrush current changes by PCB pattern, parts characteristic etc.
Check the actual inrush current value flowing through the AC line.
Table 2.5
Recommended
resistor TFR1
■The selection method of TFR1 is shown below.
・Calculation of resistance
Resistance can be calculated using the following formula.
TFR1 :Inrush current limiting resistor
RL :Line impedance
Vin :Input voltage (rms)
Ip :
Primary Inrush current (peak)
・
Calculation of required surge capacity
Required surge capacity can be calculated using the following formula.
Please contact to the component manufacturer regarding the surge current
withstanding capability.
I2t :Current squared times
TFR1 :Inrush current limiting resistor
Cbc :Smoothing capacitor for boost voltage
Vin :Input voltage (rms)
■If you need to meet the safety standards, install a discharging resistor R1 at input
interphase capacitors.
■Please select a resistor so that the input interphase voltage decreases in 42.4V or less
at 1 second after turn off the input.
■Fig.2.7 shows the relationship between a necessary resistance of R1 and total capacitance
of input interphase capacitors. The data is the value assuming the worst condition.
■Please keep margin for rated voltage and power of R1.
Fig.2.7
Relationship
between input
interphase
capacitors
and discharging
resistor R1.
2.8 Inrush current limiting resistor: TFR1
2.9 Discharging resistor: R1
A-7
Recommended resistance
4.7Ω ～ 22Ω
Applications Manual
TUNS1200
][
2
1−

=L R
Ip
Vin
TFR
0
50
100
150
200
250
300
350
400
450
500
0 1 2 3 4 5 6 7 8 9 10
R1［kΩ］
Total capacitance of input interphase capacitors ［μF］
100VAC
200VAC
277VAC
][
12
2
2sA
TFR
VinCbc
tI  =

■The boost voltage varies depending on the input voltage.
Fig.3.1
Input voltage
characteristics of
boosted voltage
※１：If you adjust the output voltage to +10% or more, the BC pin voltage will increase.
■Holdup time is determined by the capacitance of Cbc.
Figure 3.2 shows the relationship between holdup time and output current.
Fig.3.2
Relationship
between
holdup time
and Cbc
3.1 Input voltage characteristics of boosted voltage
3.2 Holdup time
A-8
Applications Manual
TUNS1200
300
350
400
450
50 100 150 200 250 300 350
Boost voltage［V］
Input voltage ［VAC］
(※1)
(365V)
(395V)
(430V)
2.1 Pin configuration
3. Holdup time
10
100
1000
020 40 60 80 100 120
Holdup time［ms］
Output current ［%］
Cbc=780μF
Cbc=1410μF
Cbc=2350μF
Cbc=3290μF
10
100
1000
020 40 60 80 100 120
Holdup time［ms］
Output current ［%］
Cbc=780μF
Cbc=1410μF
Cbc=2350μF
Cbc=3290μF
10
100
1000
020 40 60 80 100 120
Holdup time［ms］
Output current ［%］
Cbc=780μF
Cbc=1410μF
Cbc=2350μF
(1) Vin = 100VAC
(2) Vin = 200VAC
(3) Vin = 277VAC

■At low temperature, ripple voltage of boost voltage increases due to Cbc freezes.
Select a capacitor of which ripple voltage of boost voltage does not exceed 30Vp-p
on an actual operating condition.
■And check the maximum allowable ripple current of the capacitor.
■Fig.4.1,4.2 shows the relationship between ripple voltage of BC and temperature.
Fig.4.1
Ripple voltage of
BC by Ambient
temperature
AC200V
Withstand voltage
of Cbc : 450V
4.1 Ripple voltage of boost voltage
A-9
Applications Manual
TUNS1200
0
10
20
30
40
020 40 60 80 100 120
Ripple voltage of BC［Vp-p］
Output current ［%］
-20℃
-30℃
-35℃
-40℃
2.1 Pin configuration
4. Operation Under Low Temperature Conditions
Cbc = 780μF_ELXS451VSN391×2 parallel (MIN)
0
10
20
30
40
020 40 60 80 100 120
Ripple voltage of BC［Vp-p］
Output current ［%］
-20℃
-30℃
-35℃
-40℃
Cbc = 1410μF_ELXS451VSN471×3 parallel (TYP)
0
10
20
30
40
020 40 60 80 100 120
Ripple voltage of BC［Vp-p］
Output current ［%］
-20℃
-30℃
-35℃
-40℃
Cbc = 3290μF_ELXS451VSN471×7 parallel (MAX)

Fig.4.2
Ripple voltage of
BC by Ambient
temperature
AC200V
Withstand voltage
of Cbc : 500V
A-10
Applications Manual
TUNS1200
0
10
20
30
40
020 40 60 80 100 120
Ripple voltage of BC［Vp-p］
Output current ［%］
-20℃
-30℃
-35℃
-40℃
Cbc = 780μF_ELXS501VSN391×2 parallel (MIN)
0
10
20
30
40
020 40 60 80 100 120
Ripple voltage of BC［Vp-p］
Output current ［%］
-20℃
-30℃
-35℃
-40℃
Cbc = 1410μF_ELXS501VSN471×3 parallel (TYP)
0
10
20
30
40
020 40 60 80 100 120
Ripple voltage of BC［Vp-p］
Output current ［%］
-20℃
-30℃
-35℃
-40℃
Cbc = 2350μF_ELXS501VSN471×5 parallel (MAX)

■Parallel operation is available by connecting the units as shown in Fig 5.1.
■Input capacitor C11, boost voltage circuit capacitor (Cbc, C20, C30) and Inrush current
limiting resistor TFR1 cannot be used together. Please wire for each power supply .
■Total current should not exceed the value calculated by the following equation, and total
number of unit should be no more than 9 pieces.
(Output current at parallel operation) = (the rated current per unit)× (number of unit) ×0.9
■Connect the sensing line and the power line by one point after connecting each power
supply's sensing pin(+S,-S). Please do not connect the sensing from the individual power
supply as it may cause unstable operation.
■Please make sure that the wiring impedance of a load from each power supply become even.
■Output voltage and constant current can be adjusted in parallel operation.
(Refer to item 5.2, 5.3)
■When the input voltage is applied with remaining the voltage at boost capacitor Cbc, startup
time would be different for each paralleled module. If all paralleled modules need to startup
at the same time, remote control function shall be used.
■If the output current is less than 2% of the rated current, the output voltage ripple will be
large. Therefore, it is recommended to use it with 2% load or more.
Fig5.1
Wiring for parallel
operation
5.1 Wiring for parallel operation
A-11
Applications Manual
TUNS1200
2.1 Pin configuration
5. Parallel operation
Noise
Filter
Noise
Filter
Noise
Filter
Sensing point
FG
AC1
AC2
+VOUT
-VOUT
+BC -BC
FG
Cbc
+
C30
VTRM
+S
TFR1
R
C20 Cy
AC1
F11
C11
+
CB
-S
VR1Co
FG
AC1
AC2
+VOUT
-VOUT
+BC -BC
FG
Cbc
+
C30
VTRM
+S
TFR1
R
C20 Cy
AC1
F11
C11
+
CB
-S
Co
FG
AC1
AC2
+VOUT
-VOUT
+BC -BC
FG
Cbc
+
C30
VTRM
+S
TFR1
R
C20 Cy
AC1
F11
C11
+
CB
-S
Co
●
●
●
AC
INPUT Load

■When adjusting the output voltage in parallel operation, connect the VTRM terminals
together and adjust them together.
■By connecting the external potentiometer(VR1) as shown in Fig.5.2.,output voltage
becomes adjustable. See formula①
※N：Parallel number of unit
Fig.5.2.
Output voltage
adjustment by
external
resistor
■By connecting the external power supply as shown in Fig.5.3.,output voltage
becomes adjustable.
Fig.5.3.
Output voltage
adjustment by
external
power supply
Output voltage[V] ＝
(VR1 + 4.7 / N ) [kΩ]
A-12
5.2 Output voltage adjustment in parallel operation(CV)
2 × VR1 [kΩ]
× Rated output voltage [V] ・・・ ①
Applications Manual
TUNS1200
●
●
●
●
●
●

■By adjusting the voltage of one ITRM, it is possible to adjust the constant current of all
power supplies connected in parallel. It is not necessary to connect all ITRM terminals.
■By connecting the external potentiometer(VR2) as shown in Fig.5.4.,constant current
becomes adjustable. See formula②
Fig.5.4.
Constant current
adjustment by
external
resistor
■By connecting the external power supply as shown in Fig.5.5.,constant current
becomes adjustable.
Fig.5.5.
Constant current
adjustment by
external
power supply
A-13
2 × VR2 [kΩ]
× Rated output current [A] ・・・ ②
(VR2 + 4.7 ) [kΩ]
Output current[A] ＝
5.3 Constant current adjustment in parallel operation(CC)
Applications Manual
TUNS1200
●
●
●
●
●
●

■If you add one extra power supply in parallel operation, even if one of the power supplies
in your system fails, the remaining power supplies continue to function.
■Use the load current with N power supplies, and keep the current per unit below the rated
current x 0.9 or less.
■Constant current control cannot be used in N+1 redundant operation.
■The remote sensing function cannot be used in N+1 redundant operation.
■At the load end, the voltage drops due to the forward voltage (Vf) of the diode
■When the output voltage is adjusted by the volume in N+1 redundant operation, connect
the volume to each power supply as shown in Fig.5.6.
Fig5.6
Wiring for N+1
redundant
operation
■By connecting the external power supply as shown in Fig.5.7.,output voltage
becomes adjustable.
Fig5.7
Wiring for N+1
redundant
operation
A-14
5.4 N+1 redundant operation
Applications Manual
TUNS1200
●
●
●
●
●
●

■When using remote control in parallel operation, control the remote control terminals of
the power supplies in parallel at the same time, as shown in Fig.5.8 and 5.9.
Fig.5.8. Ex.1）When the power output terminal and the remote control circuit are not isolated
Remote control
wiring example
※In the case of this connection example, the control current (I_RC1) flows up to 9.7mA.
Current (N×I_RC1) for parallel connection (N) flows to the control switch.
Control current（I_RC1）= 9.7mA
Fig.5.9. Ex.2) When the power output terminal and the remote control circuit are isolated
Remote control
wiring example
※When determining Vrc and Rrc, the current (I_RC1) flowing through each remote
control circuit must satisfy the following formulas (2) and (3).
Current (N×I_RC1) for parallel connection (N) flows to the control switch.
Vrc ：External power supply voltage
：Vf_MIN = 0.9V
：Vf_MAX = 1.4V
：I_RC1current limiting resistor
5.5 Remote control
2 mA ・・・③
Rrc
≧
・・・①
A-15
12 mA ・・・②
Vf(PC1)
( Vrc - Vf_MIN )
(Rrc + 150 )
≦
( Vrc - Vf_MAX )
(Rrc + 150 )
=
Control current
（I_RC1）
Control current
（I_RC1）
=
Applications Manual
TUNS1200
RC1
RC2
-S
● ● ●
POWER
ON
OFF
AUX
1.1kΩ
150Ω
12typ
PC1
I_RC1
N×I_RC1
AUX
RC1
RC2
-S
1.1kΩ
150Ω
12typ
PC1
I_RC1
AUX
RC1
RC2
-S
1.1kΩ
150Ω
12typ
PC1
I_RC1
Control
Switch
RC1
RC2
150Ω
PC1
I_RC1
RC1
RC2
150Ω
PC1
I_RC1
● ● ●
RC1
RC2
150Ω
PC1
I_RC1
Rrc
Rrc
Rrc
Vrc
POWER
ON
OFF
N×I_RC1
Control
Switch

■By using PG, it is possible to monitor power supply whether normal operation or
abnormal operation. The PG signal is "Low" when the power supply operates correctly.
The signal turns to "High" when the power supply stops.
■The PG signal sequence is shown in Fig6.1.
Fig6.1
PG signal
sequence
※1 V1 ：60% of the set output voltage
※2 V2 ：20% of the rated output voltage
※1 V1 ：60% of the set output voltage
※2 V2 ：20% of the rated output voltage
6.1 Power Good
A-16
Applications Manual
TUNS1200
AC Input
voltage
Output
voltage
Remote
ON/OFF
ACin
RC
RC
RC
RC
ON
OFF
ON
OFF
ON
PG
AUX
OVP
OTP
OverCurrent
state
OVP
OTP
OCP
Hi-cup
V1 ※1
12V typ
0V
Low
High
ON
OFF
0V
0V
V2 ※2
AC Input
voltage
Output
voltage
Remote
ON/OFF
Adjustable
Constant
Current
OFF
PG
AUX
RC
ON
Adjustable
Voltage
ACin
ACin
ON
RC
OFF
V1 ※1
12V typ
0V
Low
High
ON
OFF
0V
0V
V2 ※2
CC-control
CV-control
2.1Pin configuration
6. Other functions

■When implementing the power supply to the printed circuit board, please fix the power
supply to the printed circuit board by screw before the soldering.
If it is screwed to the substrate after soldering, there is a possibility of failure by adding
mechanical stress to the soldering point and the internal connections of power supply.
Fig.7.1
Mounting method
■Please measure the temperature on the aluminum base plate edge side when you cannot
measure the temperature of the center part of the aluminum base plate. In this case,
please take 5deg to 10deg temperature margin from the derating characteristics.
■Use a heat sink that larger than the power supply and has a large thickness so that the
aluminum base plate can be cooled uniformly.
■The temperature distribution of the aluminum base plate varies depending on the model
and input/output conditions. It is recommended to use the side_B as the reference
because the temperature of the side_B varies little depending on the operating conditions.
Fig.7.2
Effect of heat
sink thickness
(reference)
※TUNS1200F28 at 100VAC and rated load
7.1 Mounting method
A-17
Applications Manual
TUNS1200
2.1 Pin configuration
7. Mounting method
0
1
2
3
4
5
6
7
8
9
10
0 5 10 15 20 25
⊿T(Tc-Ts) ［℃］
t : Heatsink thickness ［mm］
side_A
side_B
side_C
side_D
Heatsink
Silicone grease
(Momentive YG6260)
External components
TUNS1200F
Printed Board
(FR-4 t=1.6mm)
<Center part of the aluminum base plate.>
(Derating curve temperature)
<Aluminum base plate edge side.>
(Input)
(output)
Ts : side_A
Ts : side_C
Ts : side_B
Ts : side_D
Tc : center
t(mm)
Heat sink
Heat sink
retention screws
Silicone grease
/ Heat dissipation sheet Power supply
Power supply
retention screws Power supply soldering printed circuit board
①
②

■The potential voltage of each terminal is given below. External components that are
connected to these terminals should be at same potential voltage.
Primary side（Input line) ：AC, BC, R pin
Secondary side（Output line) ：VOUT, S, VTRM, ITRM, CB, AUX, RC, PG, PGG pin
FG(Aluminum base plate) ：Nut (4 places), Aluminum base plate, Heat sink
■In order to meet the breakdown voltage specification of products, insulation distance
components and between patterns is recommended to ensure the following.
Primary circuit - Secondary circuit ： 8mm or more
Primary circuit - FG ： 5mm or more
Secondary circuit - FG ： 1.6mm or more
Primary circuit - Primary circuit ： 3mm or more
AC terminal line - BC terminal line
： 3mm or more
■Clearance and creepage requirements vary based on different safety standards and
conditions of usage. Please place the components and wiring pattern according to those
safety standards.
Fig.8.1
Insulation
distance
8.1 Consideration for board layout
A-18
Applications Manual
TUNS1200
Aluminum base plate ：FG
PGG
RC2
CB
+S
-S
-BC
+BC
AC2
AC1
R
-VOUT
+VOUT
4-FG
PG
RC1
AUX
ITRM
VTRM
2.1 Pin configuration
8. Board layout