Cosel TUHS Series Instructions for use

2019/7/25Rev. 1.10E
Applications Manual
TUHS series

Applications Manual for TUHS series
1. Pin Assignment
Pin assignment
2. Connection for Standard Use
Connection for standard use
Input fuse ：F1
Smoothing capacitor for input voltage ：Cbc
Inrush current limiting resistor ：R1
Input capacitor (TUHS25) ：C1
Varistor ：SK1
Output capacitor ：Co
AC line filter ：L1
Y capactor ：C11,C12,C13
3. Derating
Output current derating
Input voltage derating
4. Operation under low temperature condition A-10
Outline of unstable operation at low temperature
and countermeasures
5. Holdup time
Holdup time
Holdup voltage
6. Board layout
Caution points of board layout
Reference PCB layout
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.
5.2 A-13
A-93.2
6.2 A-16
6.1 A-14
2.1
2.4 A-6
2.5
2.8
A-1
A-2
A-4
A-2
A-7
2.3 A-4
A-7
2.6 A-7
A-7
3.1
A-125.1
A-14
Contents
Page
A-1
2.2
1.1
2.7
A-12
2.9 A-7
A-104.1
A-8
A-8

1.1 Pin Assi
g
nment
Fig.1.1 ●TUHS3/TUHS5 ●TUHS10/TUHS15 ●TUHS25
Pin Assignment
(top view)
Table.1.1
Pin connection
and function
Fig.1.2
Block Diagram
6
1 AC1
4
5
-BC
Pin
Connection
2
3
FunctionNo.
-DC output
AC input
AC2
+BC +BC output
-BC output
+VOUT +DC output
-VOUT
A-1
2.1 Pin configuration
1 Pin Assignment
AC2
AC1
+BC -BC
-Vout
+Vout
AC2
AC1
+BC -BC
-Vout
+Vout
AC2
AC1
+BC -BC
-Vout
+Vout
Applications Manual
TUHS series
→
AC1
AC2
-BC +BC
+Vout
-Vout

2.1 Connection for Standard Use
■To use the TUHS series, connection shown in Figure 2.1 and external components are required.
Fig. 2.1
Connection for
standard use
■Parts name are shown in Table 2.1 as reference.
■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.
■Depending on the wiring conditions, a capacitor C14 between the primary and secondary may
be required for line conduction. If mounted, please use reinforced insulation (Y1 class certified).
Table 2.1
Parts name
※ Thermistor R1 recommended by TUHS25 can be used with other models
A-2
2.1 Pin configuration
2 Connection for Standard Use
Load
Applications Manual
TUHS series
C14
C1
Rating Part name Rating Part name
1F1 AC250V/2A SLT 250V 2A
（Nippon Seisen Cable.,Ltd.）AC250V/2A SLT 250V 2A
（Nippon Seisen Cable.,Ltd.）
A2JD-100J
（Uchihashi Estec Co.,Ltd.）
A2JD-100J
（Uchihashi Estec Co.,Ltd.）
CWFS23C□□□□100J
（KOA Corporation）
CWFS23C□□□□100J
（KOA Corporation）
3Cbc DC400V/18uＦEKXJ401□□□180□□□□S
（Nippon Chemi-Con）DC400V/22uＦEKXJ401□□□220□□□□S
（Nippon Chemi-Con）
4SK1 AC385V S10K385E2K1
（TDK EPCOS）AC385V S10K385E2K1 （TDK EPCOS）
5C1 AC250V ECQU3A104MG
（Panasonic）AC250V ECQU3A104MG （Panasonic）
6C14 AC250V/1000pF DE1E3RA102M
（Murata Manufacturing）AC250V/1000pF DE1E3RA102M （Murata Manufacturing）
Rating Part name Rating Part name
1F1 AC250V/2A SLT 250V 2A
（Nippon Seisen Cable.,Ltd.）AC250V/2A SLT 250V 2A （Nippon Seisen Cable.,Ltd.）
A2JD-100J
（Uchihashi Estec Co.
,
Ltd.）
CW3C□□□□□10R0J
（KOA Cor
p
oration）
CWFS23C□□□□100J
（KOA Cor
p
oration）
CWFS23C□□□□100J
（KOA Cor
p
oration）
3Cbc DC400V/47uＦEKXJ401□□□470□□□□S
（Nippon Chemi-Con）DC400V/68uＦEKXJ401□□□680□□□□S （Nippon Chemi-Con）
4SK1 AC385V S10K385E2K1
（TDK EPCOS）AC385V S10K385E2K1
（TDK EPCOS）
5C1 AC250V ECQU3A104MG
（Panasonic）AC250V ECQU3A104MG
（Panasonic）
6C14 AC250V/1000pF DE1E3RA102M
（Murata Manufacturing）AC250V/1000pF DE1E3RA102M
（Murata Manufacturing）
Rating Part name
1F1 AC250V/3.15A SLT 250V 3.15A
（Nippon Seisen Cable.,Ltd.）
2R1 10Ω 10D2-08LC
（SEMITEC）
3Cbc DC400V/120uＦEKXJ401□□□121□□□□S
（Nippon Chemi-Con）
4SK1 AC385V S10K385E2K1
（TDK EPCOS）
5C1 AC250V ECQU3A104MG
（Panasonic）
6C14 AC250V/1000pF DE1E3RA102M
（Murata Manufacturing）
R1 Inrush current
limiting Resistor
Primary to secondary
capacitor
Primary to secondary
capacitor
No. TUHS3 symbol Item
Varistor
Item
No. symbol
2R1 Inrush current
limiting Resistor 10Ω
2
No. symbol
Varistor
Primary to secondary
capacitor
Input fuse
Smoothing capacitor
for input voltage
Varistor
Input capacitor
Smoothing capacitor
for input voltage
Item TUHS25
Input fuse
Inrush current
limiting Resistor
Smoothing capacitor
for input voltage
TUHS5
Input fuse
TUHS15TUHS10
10Ω 10Ω
10Ω
Input capacitor
Input capacitor

■When connect the output to FG of an equipment, a noise may become big. The noise can be
reduced by connecting external filter and grounding capacitor on the input side. Refer to Fig2.2.
■Parts name are shown in Table 2.2 as reference of connecting output to FG.
Fig. 2.2
Recomemended
circuit of connect
output to FG
Table 2.2
Parts name
(connect output
to FG)
※Refer to Table 2.1 for F1, R1, Cbc, SK1,and C1.
■When using multiple power supplies, a noise filter separately from the above circuit may be required
A-3
Applications Manual
TUHS series
Rating Part name Rating Part name
1L1 25.0mH/0.4A SU10VFC-R04250
（TOKIN
)
25.0mH/0.4A SU10VFC-R04250
（TOKIN
)
2 C11,C12 AC250V/2200pF CD45-E2GA222M
（TDK）AC250V/2200pF CD45-E2GA222M （TD
K
）
3C13 AC250V/0.022u F LE223
(Okaya Elecotric Industries) AC250V/0.022uF LE223 (Okaya Elecotric Industries)
Rating Part name Rating Part name
1L1 25.0mH/0.4A SU10VFC-R04250
（TOKIN
)
35.0mH/0.5A SS11VL-R05350
（TOKIN ）
2 C11,C12 AC250V/2200pF CD45-E2GA222M
（TDK）AC250V/2200pF CD45-E2GA222M （TD
K
）
3C13 AC250V/0.022u F LE223
(Okaya Elecotric Industries) AC250V/0.022uF LE223 (Okaya Elecotric Industries)
Rating Part name
1L1 35.0mH/0.5A SS11VL-R05350
（TOKIN ）
2 C11,C12 AC250V/2200pF CD45-E2GA222M
（TDK）
3C13 AC250V/0.022u F LE223
(Okaya Elecotric Industries)
No.
Y capacitors
symbol Item
No. s ymbol TUHS3
Y capacitors
Ite m
AC line filter
AC line filter
TUHS 15TUHS1 0
TUHS 5
Y capacitors
No. s ymbol Item TUHS2 5
AC line filter

2.2 In
p
ut fuse ：F1
■No protective fuse is preinstalled on the input side. To protect the unit, install a slow-blow
type fuse shown in Table 2.2 in the input circuit.
■In the case of using DC input, please use a DC fuse.
The reference DC fuse type name is shown follow.
DC fuse type nameꞏ ꞏ ꞏBD2
0
(DC400V 2A)
(Daito Communication Apparatus Co., Ltd.)
■When the fuse is blown out, the input voltage is applied to the both ends of fuse terminals.
If the TUHS is used in the equipment which need to comply safety standard certification,
please keep the distance (2.5mm or more) between the terminals of fuse to satisfy the
requirement of safety standard.
Table 2.3
Recommended
fuse
2.3 Smoothing capacitor for input voltage: Cbc
■In order to smooth input voltage, connect aluminum electrolytic capacitor Cbc between +BC and -BC.
Recommended capacitance of Cbc is shown in Table 2.4.
■Please select the voltage rating of the aluminum electrolytic capacitor to match the specification
of the input voltage range.
AC100V system ꞏ ꞏ ꞏ DC200V or more
AC200V system ꞏ ꞏ ꞏ DC400V or more
■Ripple voltage and hold-up time will vary depending on input and output conditions
Please select the smoothing capacitor capacity refer to the table 2.4.
■Please do not exceed allowable capacity of Cbc to avoid the power supply failure.
■If you would like to confirm hold-up time for selecting the capacity of Cbc, please refer to Section 5
Hold-up Time.
■When the power supply is operated under -2
0
℃, it may cause the smoothing capacitor rippl
e
voltage increase due to the characteristic of equivalent seies resistor.
Choose the capacitor which has 3 times or more than recommended capacitance.
■When a small capacitor than the recommended capacity is selected, ripple voltage of the smoothin
g
voltage will increase.
Select a capacitor of which the ripple voltage does not exceed 25 Vp-p.
There is a possibility of more than ripple current rating of the smoothing capacitor, please parts
selection after confirming the allowable ripple current of the capacitor.
Table 2.4
Recommended
capacitance
Cbc
※1 Including wide input of AC100V/AC200
V
Model
TUHS3 15uＦ
18uＦ
15uＦ
AC100V system ※147uＦ
AC100V system ※1
Only AC200V system
22uＦ
TUHS5
47uＦ
22uＦ
15uＦ
TUHS10
22uＦ
68uＦ
Allowable max
capacitance
Recommended capacitance（Ta>=-20℃、20msec or more on AC100V）
Input condition Io<=100%
AC100V system ※1
Io<=50% Io<=75%
33uＦ
10uＦ
68uF
150uF 10uＦ15uＦ18uＦ
27uＦ
4.7uＦ
AC100V system ※110uＦ
33uＦ
27uＦ33uＦ
Only AC200V system
4.7uＦ
18uＦ
10uＦ
TUHS15 220uF
33uＦ47uＦ
2A 2ADC Rated current
6.8uＦ
Io<=25%
Only AC200V system
2A
TUHS3 TUHS5
AC Rated current
Item TUHS10
2A 2A2A
2.2uＦ
68uF 18uＦ
68uＦ
Only AC200V system 15uＦ
22uＦ
4.7uＦ6.8uＦ10uＦ
22uＦ
TUHS15
A-4
2A 2A
TUHS25
3.15A
2A
TUHS25 390uF AC100V system ※147uＦ68uＦ82uＦ120uＦ
Only AC200V system
Applications Manual
TUHS series

■Electrolytic capacitor has lifetime. So make sure that the lifetime is no problem under the usage
condition.
■Detail formula is different by capacitor manufacturer.
When calculating the lifetime, follow the instruction of capacitor manufacturers.
■The temperature of the electrolytic capacitor is required for lifetime calculation.
■Please measure the point of the electrolytic capacitor at which the temperature is maximum.
■High frequency ripple current does not flow through to Cbc.
The ripple current which has twice of input frequency and depends on the output load
(shown in Fig2.3) flows into Cbc.
■The relationship between effective ripple current of Cbc and load factor is shown in
Fig2.4 (A),(B),(C),(D),(E).
■The ripple current changes approximately 1.5 times depending on PCB patterns, external parts,
ambient temperature, etc.
If the ripple current value which 1.5 times of the data shown in Fig.2.4, exceed the allowable ripple
current of electrolytic capacitor, please measure the actual ripple current value, then calculate the lifetime.
Fig. 2.3
Current
of Cbc
Fig. 2.4
Effective ripple
current of Cbc
A-4
(A) TUHS3(Reference) 120Hz (B) TUHS5(Reference) 120Hz
(D) TUHS15(Reference) 120Hz(C) TUHS10(Reference) 120Hz
Load factor[%]
ripple current [mArms]
Applications Manual
TUHS series
Load factor[%]
ripple current [mArms]
Load factor[%]
ripple current [mArms]
Load factor[%]
ripple current [mArms]
(E) TUHS25(Reference) 120Hz
Load factor[%]
ripple current [mArms]

2.4 Inrush current limitin
g
Resistor: R1
■The TUHS series have no internal inrush current limiting circuit.
■Connect resistor R1 between AC input and power supply to limit inrush current up to
50A(TUHS3/5/10/15) and 60A(TUHS25). Select a resistor which has enough permissible
current capability.
■Fomula of inrush current is shown below. Please calculate the inrush current from this equation.
■Inrush current prevention element has power loss and genetates heat by input current.
Please select the power thermistor if the power loss of the resistor and efficiency drop are not
acceptable.
■When a power thermistor is used, inrush current will increase at high ambient temperature
because of the reduction of the resistance of the thermistor. Please do not turn on/off the input
repeatedly within a short period of time. Keep appropriate intervals to allow the power supply
to cool down sufficiently before turning on.
■The inrush current value, with the parts shown in Table 2.1, shown in Fig 2.5.
Fig. 2.5
Inrush current
values
■Available AC voltage for inrush current prevention element varies by the smoothing capacitor value.
The relationship between the value of smoothing capacitor and AC voltage of the recommended
inrush current prevention element to reference is shown in Figure 2.6.
Fig. 2.6
Characteristics of
power thermistor
resistor
R1
■Under low temperature conditions, the output of power supply may be unstable due to high ESR values
of the power thermistor and Cbc. Check with the actual device before use.
※Refer to page A-8 for operation under low temperature conditions.
A-6
L
in
p
RR
V
I
1
2*
Ip ：Inrush current[peak]
Vin：Input voltage[rms]
R1 ：Inrush current limiting Resistor
AC200Vin
Ta：85ºC
Ta：25ºC
Ta：-20ºC
23A
21A
7A
TUHS5F24
セメント抵抗(1K100JA)使用
TUHS5F24
Use resistor (1K100JA)
AC200Vin
Ta：85ºC
Ta：25ºC
Ta：-20ºC
48A
24A
4A
TUHS25F24
サーミスタ(10D2-08LC)使用
TUHS25F24
Use thermistor (10D2-08LC)
Applications Manual
TUHS series

2.5 In
p
ut ca
p
acitor：C1
(
TUHS25
)
■To comply with conducterd noise CISPR22-B, EN55022-B, connect capacitor C1 which is 0.1μF
between AC input terminals.
■Use a capacitor with a rated voltage of AC250V which complies with the safety standards.
■If 0.11μF or more capacitor is connected, the discharge resistor is necessary in order to
comply UL60950-1. Please connect the discharge
r
esistor which satisfy the following formula.
2.6 Varistor：SK1
■In order to comply with IEC61000-4-5 Level 3 (surge immunity), coonnect a surge protective device.
■Overvoltage category changes depending on the location for installing the power supply.
Recommended components is complying to the overvoltage category II.
For example, home electronics and information equipment corresponds the installation category II.
And they are installed the primary part of the equipment which is connected to outlet by power cable.
If installation category III (required to connect distribution panel directly) is required, the varistor
must be bigger than recommended varistor.
Please confirm whether the components comply the standards.
2.7 Out
p
ut ca
p
acitor：Co
■In the TUHS series, the output capacitor is basically unnecessary. Reduce the ripple voltage or suppress
fluctuation in an output voltage by connecting the output electorolytic capacitor or ceramic capacitor.
The connection example is shown in Fig 2.7.
■When the pulse load is connected, the output voltage will change transiently.
Please check the level of the fluctuation in your situation.
And if the transient output voltage change is not acceptable, please connect the output capacitor Co
.
Fig.2.7
Connecting Example of
an External Capacitor
to the Output Side
Table 2.5
Recommended
capacitance
Co
2.8 AC line filter：L1
■The commom mode choke coil should be selected with confirmation because there are wire grade
and rated temperature of bobbin.
2.9 Y Ca
p
acitors：C11
,
C12
,
C13
■Please choose safety certified capacitor (Y1, Y2 class approved) to C11 and C12
.
However,
if secondary circuit is shorted to FG, not connected by capacitor, please choose Y1 class capacitor
as C11 and C12.
■During high voltage test, the voltage applied to C13 is determined by the value of C11, C12 and C13.
Please note the rated voltage of the capacitor. Fomula of the voltage applied to C13 is shown below.
■The noise reduction level depends on the location of the grounding capacitor.
Please connect the capacitor as close as possible to the power supply.
0～330μF
TUHS5 TUHS10 TUHS15
0～47μF 0～150μF
5V 0～100μF 0～100μF
TUHS25
-
A-7
12V 0～470μF0～47μF
Output voltage TUHS3
0～68μF 0～68μF
0～150μF
24V 0～22μF 0～22μF
15V 0～47μF 0～47μF 0～120μF 0～120μF 0～390μF
0～1000μF
0～220μF
42.4)2(Vlog
1
ine1
／
≦
uuC
R
test
CCC CC VV
312111
1211
C13
u


VC13 ：Voltage applied to C12
C11,C12 ：Y capacitor on the primary side
C13 ：Y capacitor on the secondary side
Vtest ：Test voltage
R ：Discharge resistor
C1：Input capacitance
Vin：Input voltage 120V or 240V[rms]
Load
Applications Manual
TUHS series

3.1 Out
p
ut current deratin
g
3.1 Out
p
ut deratin
g
■Please have sufficient ventilation to keep the temperature of point A in Fig.3.1 at Table 3.1
or below. Please also make sure that the ambient temperature does not exceed 85℃
■Derating curve is shown Fig.3.2.
Note: In the hatched area, the specification of Ripple, Ripple Noise is different form other area.
Table 3.1
Point A Temperature
Fig. 3.1
Temperature measuring
point on the case
(Top view)
Fig. 3.2
Output derating
A-8
Model TUHS3 TUHS5 TUHS10
Point A 105℃105℃105℃100℃95℃100℃
TUHS15 TUHS25
Output voltage all all all 12V,24V 15V all
2.1 Pin configuration
3.Derating
(A) TUHS3 Derating curve(Reference)
(B) TUHS5 Derating curve(Reference)
(C) TUHS10 Derating curve(Reference)
(D) TUHS15 Derating curve(Reference)
Point A(Center of the Case)
Applications Manual
TUHS series

3.2 In
p
ut deratin
g
■Input derating curve is shown Fig.3.3.
In cases that conform with safety standard, input voltage range is AC100-AC240V (50/60Hz)
and DC120-DC370V.
■The operating temperature range, please refer to Section 3.1.
Fig. 3.3
Input derating
A-9
(A) TUHS3
(B) TUHS5/TUHS10/TUHS15/TUHS25
Applications Manual
TUHS series
(AC input) (DC input)
(AC input) (DC input)
Load factor[%]
Input voltage[Vac]
Load factor[%]
Input voltage[Vdc]
Load factor[%]
Input voltage[Vac]
Load factor[%]
Input voltage[Vdc]
(E) TUHS25 Derating curve(Reference)

4.1 Outline of unstable o
p
eration at low tem
p
erature and countermeasures
■At low temperatures, ESR of Cbc and power thermistor become high
.
At this condition, the output voltage may become unstable due to the voltage drop on the inrush
current limiting components and Cbc. Please select the appropriate Cbc and R1.
■The output voltage becomes unstable easily when the components temperature is low and startup
or dynamic load change
.
Fig. 4.1 shows stable operation at 25ºC and unstable operation at -40ºC after startup and at dynamic
load changes. The power supply is repeatedly starting and stopping if unstable operation is happened.
Fig.4.1
Difference of
operation with
temperature
■The operation is improved by increasing the temperature of the component.
<Notes for operation at ambient temperatures between -20ºC and -40ºC>
* Output voltage may be unstable continuously at low load current. In this case, minimum
load current is necessary.
* The output becomes stable after a few minutes operation because the characteristics of
thermistor and Cbc become stable
.
A-10
Vac Vin Vo
Io
TUHS
2.1 Pin confi
g
uration
4. Operation Under Low Temperature Conditions
Start-up (TUHS25F12)
Load 0% ⇒100% (TUHS25F12)
Vac
(100V/div)
Vin
(100V/div)
Vo
(5V/div)
(200ms/div)
Vac
(100V/div)
Vin
(100V/div)
Vo
(5V/div) unstable
(200ms/div)
Io
(1A/div)
Vo
(5V/div)
(100ms/div)
Io
(1A/div)
Vo
(5V/div) unstable
(100ms/div)
Vac Vo
Io
TUHS
Ta=25℃Ta=-40℃
Load
Applications Manual
TUHS series
Vin

■In order to avoid unstable operation, please reduce the input ripple voltage of the BC terminal.
Please be three times or more of the recommended capacity in connection permission capacit
y
within the capacity of the Cbc.
Please select the capacitor with low ESR and excellent temperature characteristics.
■In order to avoid unstable operation, please reduce the voltage drop due to inrush current
prevention element.
Please select the value of inrush current limiting resistor R1 depending on the load factor
.
Fig. 4.2 shows the upper limit of the resistance of inrush current limiting resistor.
Please select the resistance of power thermistor or resistor to be less than the value of upper limit.
Note that the resistance should be lower than the value shown in Fig.4.2 if the temperature
characteristic of Cbc is bad or high ESR type is used.
Fig.4.2
Connection permission
inrush current limiting
resistance upper limit
*Allowable resistance with 3 times capacitance from recommended value of Cbc
by using KXJ series (Nippon Chemi-Con)
■
Fomula of resistance value of R1 and R1' is shown below.
■
Fig.4.3
The inrush current
parallel limiting resistor
in low temperature
A-11
By connecting R1 and R1' thermally by silicone rubber etc., the power loss of inrush current limiting
element can be reduced efficiently because the resistance of power thermistor reduces due to the heat
from the resistor R1'.
If the resistance of power thermistor which may exceed the value shown in Fig.4.2, thermal resistor
which the resistance doesn't change by ambient temperature should be connected in parallel with the
thermistor (shown in Fig.4.3).
R1
R1´
´
´
´//
11
11
11
RR RR
RR 
u
R1 ：Inrush current limiting power thermistor
R1´：Inrush current limiting resistor to be connected in parallel
Load factor[%]
Connection permission resistance
upper limit [Ω]
Applications Manual
TUHS sereis

5.1 Hold-u
p
time
■Hold-up time is determined by the capacitance of Cbc. Fig. 5.1 shows the relationship
b
etween hold-up time and load within the allowable capacitance of Cbc.
■Fomula of capacitance of Cbc is shown below.
Fig. 5.1
Relationship
between
hold-up time
and Cbc
A-12
)(
t
Cbc 22
hold
hin VV
Po
u
u
η
thold[sec] ：Hold-up time
Vin[ V ] ：Input Voltage
Vh[ V ] ：Minimum input voltage for regulated output voltage
Po [ W ] ：Output power
η [ % ] ：Power supply efficiency
2.1 Pin configuration
5. Hold-up Time, Hold-up Voltage
TUHS3 Hold-up time (AC100V) TUHS3 Hold-up time (AC200V)
TUHS5 Hold-up time (AC100V) TUHS5 Hold-up time (AC200V)
TUHS10 Hold-up time (AC100V) TUHS10 Hold-up time (AC200V)
TUHS15 Hold-up time (AC100V) TUHS15 Hold-up time (AC200V)
（Reference）
Load factor[%]
Hold-up time [msec]
Load factor[%]
Hold-up time [msec]
Load factor[%]
Hold-up time [msec]
Load factor[%]
Hold-up time [msec]
Load factor[%]
Hold-up time [msec]
Load factor[%]
Hold-up time [msec]
Load factor[%]
Hold-up time [msec]
Load factor[%]
Hold-up time [msec]
Applications Manual
TUHS series
（Reference）
（Reference）（Reference）
（Reference）（Reference）
（Reference）（Reference）

5.2 Hold-u
p
volta
g
e
■Fig. 5.2 shows the relationship between hold-up voltage and load.
These data are the approximate indication for the hold-up voltage.
Fig. 5.2
Relationship
between
hold-up voltage
and load
A-13
(A)TUHS3 hold-up voltage （Reference）(B)TUHS5 hold-up voltage （Reference）
（C)TUHS10 hold-up voltage （Reference）(D)TUHS15 hold-up voltage （Reference）
Load factor[%]
Hold-up voltage [Vac]
Applications Manual
TUHS series
Load factor[%]
Hold-up voltage [Vac]
(E)TUHS25 hold-up voltage （Reference）
Load factor[%]
Hold-up time [msec]
Load factor[%]
Hold-up time [msec]
TUHS25 Hold-up time (AC100V) TUHS25 Hold-up time (AC200V)
（Reference）（Reference）
Load factor[%]
Hold-up voltage [Vac]
Load factor[%]
Hold-up voltage [Vac]
Load factor[%]
Hold-up voltage [Vac]

6.1 Considerations for com
p
onent
p
lacement and wirin
g
p
attern
■Recommend not wire the high voltage line (AC and +BC voltage) on the surface of the primary
components side.
■The distance between the pattern connected to AC and +BC must be separeted 3mm or more.
■And the distance between primary elements (components and patterns) and secondary elements
must be separeted 8mm or more.
■Figure 6.1. shows the creepage distance as reference.
■Exterior of the electrolytic capacitor is considered as same potential as the negative terminal, it will
be included in the primary component. Please note the distance between secondary side
(including pattern) and exterior of the electrolytic capacitor.
■However, the clearance and creepage distance varies depending on the usage condition and the
requirement of the safety standard, please confirm before the PCB design.
Fig.6.1
Creepage distance
■Prohibited area of the wiring pattern and component placement is shown in Figure 6.2. (A), (B), (C).
Fig.6.2
Prohibited area of
arround power supply
A-14
3mm or more
8mm or more
2.1 Pin configuration
6.Board layout
(A) TUHS3/TUHS5 (B) TUHS10/TUHS15
(C) TUHS25
Inhibition area of pattern
and parts of the primary
Inhibition area of pattern
and parts of the secondary
Inhibition area of pattern
and parts of the primary
Inhibition area of pattern
and parts of the secondary
Inhibition area of pattern
and parts of the primary
Inhibition area of pattern
and parts of the secondary
Applications Manual
TUHS series

■There is the possibility that the significant radiation noise is generated, please connect input
smoothing capacitor Cbc to the ± BC terminal as close as possible.
■If 2 layer or more substrate is used, the radiation noise can be reduced by crossing the output
pattern (+Vo, -Vo) as shown in Fig.6.3.
Fig.6.3
Output wire
reference
■Long output wiring may generate significant radiation noise, please wire it as short as possible.
■If it is difficult to be short the output wiring, 470~2200pF capacitor C14 should be connected
between primary (+BC or -BC) and secondary (+Vout or -Vout) to reduce radiation noise.
10~100MHz radiation noise can be reduced by connecting C14.
■The capacitor C14 which is connected between primary and secondary must be Y1 class
certified (reinforced insulation).
■Figure 6.4. shows the connection between primary and secondary capacitor C14.
Fig.6.4
Circuit of connect
capacitor
between primary
and secondary
A-15
Load
C14
-
V
out
+Vout
Patterns of the surface of power supply mounting surface
Patterns of the opposite surface of power supply mounting
Applications Manual
TUHS series

6.2 Reference PCB layout
■Fig 6.5 (A),(B),(C) shows the reference PCB layout which is used the components listed in Table 2.1.
Fig.6.5
Reference PCB layout
（Double sided)
A-16
(A) TUHS3/TUHS5
(B) TUHS10/TUHS15
(C) TUHS25
Applications Manual
TUHS series

Revision history
A-17
Applications Manual
TUHS series
No. date page content
1 2014.5.1 A-2 table2.1 Reference AC Fuse Type Name change
2 2014.5.1 A-3 Reference DC Fuse Type name added
3 2014.5.1 A-4 But, if the ripple current of ・・・ deleted
4 2014.11.14 A-1 1.1 Block Diagram added
5 2014.11.14 A- 8 3.2 input derating added
6 2015.1.23 A-2 Change of fig 2.2 and table 2.1
7 2015.5.20 - Add items related to TUHS15F
8 2015.11.20 A- 12 Changing the formula of Hold-up time
9 2017.9.20 - Add items related to 15V
10 2019.07.25 A-2,A-7,
A-14,A16 condenser for Line Conduction C1,C14・・・added
12 2019.07.25 A-2 Changed inrush limiting resistor to A2JD-100J L3.5（Uchihashi Estec
Co.,Ltd.）、CWFS23C 10Ω（KOA corporation）
13 2019.07.25 A-3 Changed Y capacitors to CD45-E2GA222M（TDK）