TRANSFORMERS
April 2014
Transformers for Switching Power Supplies
Pinterminaltype(Formultipleoutputs)
ECO series
ECO20
˄
Vertical/Horizontal types
˅
ECO22
˄
Vertical/Horizontal types
˅
ECO24
˄
Vertical/Horizontal types
˅
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TRANSFORMERS
An attention matter on use
Please read this specifications before using this product by all means.
An attention matter on security
I undertake use with this product, and it is paid attention enough, and please design an attention matter safely.
When you designs a base of an electric circuit.
Please use size of the hole or pad which we recommend.
Magnetic flux to leak out occurs. Please confirm it about influence of magnetic flux beforehand.
There is fear to cause false movement of machinery.
In a design of a base of an electric circuit, Please consider the next contents.
In an applied safe standard.
The trans and distance with other parts
The product is not quakeproof structure.
Accordingly please do not add vibration and a shock to it.
There is fear to lose a function.
Please do not use it when you let a product drop.
The product produces possibility to lose a function
Please pay attention to the pin which had it pointed keenly.
There is danger to injure.
Please avoid the next place. The place that receives a drop of water, trash, the dust, foggy influence. The place where direct rays of the sun hits. There is
fear to cause false movement of machinery.
Please prohibit safekeeping and use at the next place. Environment to be accompanied with gas corrosion, salt, acid, alkali. There is fear to lose a
function.
When you carry the product on a base of an electric circuit.
Please do not use a metal tool. Because impossible power is added to a product.
There is fear to lose a function.
I considered the next matter, and we designed a product.
Safe standard and power supply voltage and circuit drive condition, drive frequency and Duty ON-TIME.
By those conditions, we decided structure and the turns number.
Please avoid use in designed condition outside.
There are destruction of a circuit part and fear of ignition.
This product considered a characteristic of a component and a self temperature rise, and it was made.
We select range of humidity as use temperature already.
Please avoid use by range more than this.
There are the damage and fear of ignition.
Please avoid use in the environment next.
The environment that trash and the dust stick to a product. There is fear to cause a fire.
The products listed on this specification sheet are intended for use in general electronic equipment (AV equipment, telecommunications equipment,
home appliances, amusement equipment, computer equipment, personal equipment, office equipment, measurement equipment, industrial robots)
under a normal operation and use condition.
The products are not designed or warranted to meet the requirements of the applications listed below, whose performance and/or quality require a more
stringent level of safety or reliability, or whose failure, malfunction or trouble could cause serious damage to society, person or property.
If you intend to use the products in the applications listed below or if you have special requirements exceeding the range or conditions set forth in this
catalog, please contact us.
(1) Aerospace/Aviation equipment
(2)Transportation equipment (cars, electric trains, ships, etc.)
(3) Medical equipment
(4) Power-generation control equipment
(5) Atomic energy-related equipment
(6) Seabed equipmentapplications
(7) Transportation control equipment
(8) Public information-processing equipment
(9) Military equipment
(10) Electric heating apparatus, burning equipment
(11) Disaster prevention/crime prevention equipment
(12) Safety equipment
(13) Other applications that are not considered general-purpose
applications
When designing your equipment even for general-purpose applications, you are kindly requested to take into consideration securing protection circuit/device
or providing backup circuits in your equipment.
Attention on a design
Attention on the handling
Attention
Transformers for Switching Power Supplies
ECO series
Contents Page
Development Concept ....................................................................................4
Overview .........................................................................................................5
Product Lineup................................................................................................7
ECO20 seriesȁFor multiple outputs ˄Vertical/Horizontal types˅.................9
ECO22 seriesȁFor multiple outputs ˄Vertical/Horizontal types˅...............12
ECO24 seriesȁFor multiple outputs ˄Vertical/Horizontal types˅...............17
List of Plans for Standard Windings and Connections..................................26
Design Reference for Switching Power Transformers ...................................30
Specification Request Forms
For Flyback Converter ...............................................................................33
For Home Appliances................................................................................34
•All specifications are subject to change without notice.
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• All specifications are subject to change without notice.
TRANSFORMERS
Transformers for Switching Power Supplies
Pin terminal type (For multiple outputs)
The ECO series is compliant with worldwide safety standards*. It is a pin-compatible, newly developed transformer that can be downsized
and thinned.
* Applicable as of April 2007: UL/IEC/J 60065 Ver.7 (TV, DVD, STB), UL/IEC/60950 Ver.3 (printer), UL/IEC 60335-1 Ver.4 (home appliance)
MATERIAL
Optimum materials and core shape have been developed. No insulation-supporting material is used, and this secures the insulating
distance.
While optimizing materials, TDK has further improved its proprietary core shape to develop a new-type ECO core. TDK has downsized
the product considerably in order to securing the necessary creepage distance.
MANUFACTURING METHOD
Since the ECO Series supports automatic winding, the product is of a high quality and can be manufactured stably.
It is designed to support automatic winding, which enables a remarkable reduction in the loss generated to achieve a proficient in
manual winding until stable production.
OPTIMIZATION DESIGN
Using design tools developed with TDK’s comprehensive know-how, high-precision design has been achieved in a short period of time.
1) For optimization design and high-quality stable production, customers can use a specification request form.
2) If you provide the necessary information in the form, you will receive the optimization design in a short time.
3) We have prepared an individual specifications request document for the home appliance market.
4) TDK recommends design with a standard core gap (AL-value) for optimization and shorter trial and mass production lead time.Plans
for standard winding connection (patterns of recommended pin arrangement and winding structure) are available.These help to
speed up the design process, support automatic winding, and prevent deterioration in quality.
ENVIRONMENT
The ECO series is RoHS directive-compliant.
Development Concept of the ECO Series
Product compatible with RoHS directive
Compatible with lead-free solders
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• All specifications are subject to change without notice.
TRANSFORMERS
Transformers for Switching Power Supplies
Pin terminal type (For multiple outputs)
FEATURES
Downsized yet compliant with worldwide safety standards.
Supports automatic winding.
Considerably reduced characteristic variations.
Product compatible with RoHS directive.
APPLICATION
Set-top boxes, air-conditioners, DVD players/recorders
Blu-ray disc players/recorders, printers, LCD monitors
Multiple-output power supplies
PART NUMBER CONSTRUCTION
OPERATING TEMPERATURE RANGE, PACKAGE QUANTITY, PRODUCT WEIGHT
With self-heating
 Maximum wet-bulb temperature 38°C, without dewing
Without dewing
Overview of the ECO Series
ECO 2017SEO - ɕɕɕɕɕɕɕɕ
Series name Core shape Internal code
Type
Temperature range Humidity range Standard test conditions
Operating
temperature
Storage
temperature
Operating humidity
range
Storage humidity
range
Ambient
temperature
Relative humidity
range
˄
°C
˅ ˄
°C
˅ ˄
%RH
˅ ˄
%RH
˅ ˄
°C
˅ ˄
%RH
˅
ECO2017 -30 to +120 -40 to +80 10 to 95 10 to 95 25 ± 10 25 to 75
ECO2020 -30 to +120 -40 to +80 10 to 95 10 to 95 25 ± 10 25 to 75
ECO2023 -30 to +120 -40 to +80 10 to 95 10 to 95 25 ± 10 25 to 75
ECO2219 -30 to +120 -40 to +80 10 to 95 10 to 95 25 ± 10 25 to 75
ECO2225 -30 to +120 -40 to +80 10 to 95 10 to 95 25 ± 10 25 to 75
ECO2230 -30 to +120 -40 to +80 10 to 95 10 to 95 25 ± 10 25 to 75
ECO2420 -30 to +120 -40 to +80 10 to 95 10 to 95 25 ± 10 25 to 75
ECO2425 -30 to +120 -40 to +80 10 to 95 10 to 95 25 ± 10 25 to 75
ECO2430 -30 to +120 -40 to +80 10 to 95 10 to 95 25 ± 10 25 to 75
Product compatible with RoHS directive
Compatible with lead-free solders
RoHS Directive Compliant Product: See the following for more details related to RoHS Directive compliant products. http://www.tdk.co.jp/rohs/
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TRANSFORMERS
Overview of the ECO Series
GENERAL CHARACTERISTICS
RELIABILITY TESTS
ɑThe above listed items are representative examples.
ȁThe details can be found by referring to the appended individual delivery specifications.
Item Standards Test methods
Inductance Individual specification
(tolerance±10%)
Use LCR meter (f=10kHz), 4263B or equivalent.
DC resistance Less than 0.1:: ±30%
0.1: to 1.0:: ±20%
1.0: or more: ±15%
Use Ohm-meter AX114N or equivalent.
Turn ratio and polarity Specified value ±1 to 20%, individual
specification
Use turn ratio tester TRM-201 (f=1 to 100kHz) or equivalent.
Withstand voltage No abnormality between the primary and
secondary windings, between the primary
winding and the core, and so on.
Apply separately specified AC voltage (50Hz) for 1min.
Insulation resistance 100M: min. Measure by applying DC.500V.
Use insulation resistance meter SM-5E or equivalent.
Temperature rise Standard design value
45°C max. (thermocouple method)
55°C max. (resistance method)
Measure the core surface by thermocouple method, and the windings by resistance
method or thermocouple method.
Item Standards Test methods
Vibration resistance
Standard of inductance, insulation
resistance, withstand voltage must be
satisfied.
Sweep 1.5mm amplitude and 10-to-55-to-10Hz in 1min in X, Y, and Z directions for
2h respectively.
Heat resistance Measure in normal temperature after leaving in 100±2°C for 96h.
Cold resistance Measure in normal temperature after leaving in –40±2°C for 96h.
Humidity resistance Measure in normal temperature after leaving in 60±2°C and 90 to 95(%)RH for 96h.
Temperature cycle One cycle is –25°C for 30min, normal temperature for 30min, and 85°C for 30min;
measure after 10 cycles of the test have been performed.
Terminal strength 9.8N min. Apply 9.8N load in the direction of terminal axis for 30±5s.
Any terminal must not be pulled out or chatter.
Solderability Solder covers more than 90%. Dip in solder with the temperature of 245±2°C for 3±0.5s.
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TRANSFORMERS
Product Lineup
We have made a new lineup of replacement parts for products with different shapes that meet our customers’ needs for smaller products.
We can also provide different transformer shapes not shown in the catalog, so feel free to contact us.
Vertical type Horizontal type
Product Lineup
1Ferrite cores are not sold separately.
2 The reference output was obtained under conditions where the frequency was 50kHz and creepage distance was 4mm. (See the relevant page for details
of each shape.) The reference output differs depending on the switching device, switching frequency, transformer temperature, conditions, etc. Use this
output for reference.
3The bobbin is made from phenol with a flame resistance grade of 94V-2 or higher.
New
shaped1
Core parameter Bobbin parameter Dimensions
General-
purpose
shaped
cores
Cross-sectional
center leg area
Ae (mm2)
Reference
output power2
(W)
Switching
Frequency
fsw(kHz)
Bobbin
Ty p e 3
Te r mi na l
Pin pitch
P
(mm)
Lead
space
F
(mm)
Number
of pins
Depth Width Height
D × W × H
(mm)max.
Vertical type
ECO2017 EI22
EE25/19 36.3
12
50
Vʯ
3.7515.012
19.5 22.5 24.0
ECO2020 20 Vʯ19.5 22.5 27.0
ECO2023 26 Vʯ19.5 22.5 30.0
ECO2219
EED2820
EER28
46.4 25 50
Vʯ5.0 17.5 12 23.0 28.5 25.0
Vʰ4.0 17.5 12 23.0 24.0 25.0
Vʱ3.75 17.5 14 23.0 30.0 25.0
ECO2225 46.4 36 50
Vʯ5.0 17.5 12 23.0 28.5 31.0
Vʰ4.0 17.5 12 23.0 28.5 31.0
Vʱ3.75 17.5 14 23.0 30.0 31.0
ECO2230 46.4 48 50 Vʯ5.0 17.5 12 23.0 28.5 36.0
Vʰ4.0 17.5 12 23.0 24.0 36.0
ECO2420
EER28L
63.8 35 50 Vʯ5.0 17.5 12 24.0 28.5 26.5
Vʰ4.0 20.0 14 25.0 31.5 26.5
ECO2425 63.8 50 50 Vʯ5.0 17.5 12 24.0 28.5 31.5
Vʰ4.0 20.0 16 25.0 35.5 31.5
ECO2430 63.8 68 50 Vʯ5.0 17.5 12 24.0 28.5 36.5
Vʰ4.0 20.0 16 25.0 35.5 36.5
Horizontal type
ECO2017
EE25/19 36.3
5
50
Hʯ3.75 20.0 12 24.5 23.5 20.0
ECO2020 14 Hʯ3.75 22.5 12 27.0 23.5 20.0
ECO2023 20 Hʯ3.7525.01229.523.520.0
ECO2219
EER2820
46.4 18 50 Hʯ5.0 20.0 12 25.0 29.0 24.0
Hʰ4.0 20.0 12 25.0 26.0 24.0
ECO2225 46.4 30 50 Hʯ5.0 25.0 12 30.5 29.0 24.0
Hʰ4.0 25.0 12 30.5 26.0 24.0
ECO2230
EER28
46.4 42 50 Hʯ5.0 30.0 12 35.5 29.0 24.0
Hʰ4.0 30.0 12 35.5 26.0 24.0
ECO2425 63.8 41 50 Hʯ5.0 25.0 12 30.5 30.0 25.0
Hʰ4.0 25.0 12 30.5 27.0 25.0
ECO2430 EER28L 63.8 59 50 Hʯ5.0 30.0 12 36.0 30.0 25.0
Hʰ4.0 30.0 12 36.0 27.0 25.0
Horizontal type (SLDtype)
ECO2425SLD 46.7 29 50 Hʯ4.0 25.0 12 30.0 26.0 20.0
H
D
W
H
W
D
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• All specifications are subject to change without notice.
TRANSFORMERS
Lineup of ECO Series
20 40 100
20
25
30
35
40
Height from substrate(mm)
Handling power(W)
60 80
ECO
2425
ECO
2430
ECO
2230
ECO
2225
ECO
2023
ECO
2020
ECO
2017
ECO
2219
ECO
2420
ECO
2430
ECO
2230
ECO
2425
ECO
2225
ECO
2219
ECO
2023
ECO
2425
SLD
ECO
2020
ECO
2017 : Vertical type
: Horizontal type
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TRANSFORMERS
ECO20 seriesȁ
For Multiple Outputs
˄
Vertical/Horizontal types
˅
ELECTRICAL CHARACTERISTICS : Recommended range
The Vertical type places its described creepage distance and its half distance on the terminal side and guard side, respectively. The Horizontal type
places its described creepage distance on both sides.
Transformer-handling power may differ depending on switching devices, switching frequency, transformer temperature, conditions during usage, etc.
Therefore, use the handling power for reference only.
STANDARD CORE AL-value
In order to respond to our customers’ requested delivery dates and costs, TDK can provide standard GAP products (indicated by " ɐ" in the below chart) for
each shape.
Please contact us about other GAP products separately.
Ty p e Frequency
Transformer handling power(W) [Vertical/Horizontal type]
Creepage
distance
0.0mm 2.0mm 2.5mm 3.2mm 4.0mm 5.0mm 6.4mm 8.0mm
ECO2017
50kHz 33 21/18 19/14 15/10 12/ 5 7/– ––
75kHz 49 31/26 28/21 23/15 17/ 8 10/– 1/– –
100kHz 54 34/29 31/24 25/16 19/ 8 11/– 1/– –
ECO2020
50kHz 37 28/25 26/22 23/18 20/14 16/ 8 10/– 3/–
75kHz 56 41/38 39/33 35/28 30/21 24/13 15/ 1 5/–
100kHz 59 46/40 41/35 37/29 31/22 25/14 16/ 1 5/–
ECO2023
50kHz 42 33/31 31/28 29/25 26/20 22/15 17/ 8 11/–
75kHz 62 50/46 47/42 43/37 39/31 33/23 25/13 16/–
100kHz 64 51/47 48/43 44/37 39/31 34/24 26/13 16/–
Ty p e
Core parameter Bobbin parameter Dimensions Applications
General-
purpose
cores
cores
material
center leg
area
Ae
(mm2)
Bobbin
Ty p e
Spool
width
(mm)
min.
Spool
height
(mm)
min.
Number
of pins
Depth Width Height
D × W × H
STB
Air
condi-
tioner
DVD BD Others
(mm)max.
ECO2017
EE25/19
(EI22)
PC47
family 36.3
Vʯ10.4 3.6 12 19.5 22.5 24.0 ɐ
Hʯ9.8 3.7 12 24.5 23.5 20.0
ECO2020 Vʯ13.4 3.6 12 19.5 22.5 27.0 ɐɐ ɐ
Hʯ12.8 3.7 12 27.0 23.5 20.0
ECO2023 Vʯ16.4 3.6 12 19.5 22.5 30.0 ɐɐ ɐ
Hʯ15.8 3.7 12 29.5 23.5 20.0
Ty p e AL-value: R20 series(nH/N2)
100 112 125 140 160 180 200 224 250 280 315 400
For multiple outputs
ECO2017 ɐɐɐɐɐɐɐɐɐɐ
ECO2020 ɐɐɐɐɐɐɐɐɐɐ
ECO2023 ɐɐɐɐɐɐɐɐɐɐ
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TRANSFORMERS
ECO20 seriesȁFor Multiple Outputs (Vertical type)
SHAPE & DIMENSIONS
Bobbin type
˖
V
ʯ
RECOMMENDED BASE MATERIAL OPENING SIZE
RECOMMENDED PLANS FOR WINDINGS AND CONNECTIONS
ɑPlease refer to P.26 for more details about the list of plans for standard windings and connections.
Ty p e Bobbin type H max.
ECO2017 Vʯ24.0
ECO2020 Vʯ27.0
ECO2023 Vʯ30.0
Item Number of secondary circuits
2-connection 3-connection
1st side
1-output
1
2
3
4
5
67
8
9
10
11
12
H max. 3.5±0.8 12-ø0.8
22.5max.
19.5max.
Dimensions in mm
12
76
1
15.0±0.1
3.75±0.1
12-ø1.3 Dimensions in mm
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NP1
NB
NS1b
NS1a
A
B6
5
4
x
2
1
7
8
9
10
11
12
NP2
NS1b
NS1a
NP1
NB
NS2
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TRANSFORMERS
ECO20 seriesȁFor Multiple Outputs (Horizontal type)
SHAPE & DIMENSIONS
Bobbin type
˖
H
ʯ
RECOMMENDED BASE MATERIAL OPENING SIZE
RECOMMENDED PLANS FOR WINDINGS AND CONNECTIONS
ɑPlease refer to P.26 for more details about the list of plans for standard windings and connections.
Ty p e Bobbin type D max. F
ECO2017 Hʯ24.5 20.0
ECO2020 Hʯ27.0 22.5
ECO2023 Hʯ29.5 25.0
Item Number of secondary circuits
2-connection 3-connection
1st side
1-output
1
2
3
4
5
67
8
9
10
11
12
20.0max. 3.5±0.8
23.5max.
D max.
12-ø0.8 Dimensions in mm
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NP1
NB
NS1b
NS1a
C
D
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NS1b
NS1a
NP1
NB
NS2
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TRANSFORMERS
ECO22 seriesȁ
For multiple Outputs
˄
Vertical/Horizontal types
˅
ELECTRICAL CHARACTERISTICS : Recommended range
The Vertical type places its described creepage distance and its half distance on the terminal side and guard side, respectively. The Horizontal type
places its described creepage distance on both sides.
Transformer-handling power may differ depending on switching devices, switching frequency, transformer temperature, conditions during usage, etc.
Therefore, use the handling power for reference only.
STANDARD CORE AL-value
In order to respond to our customers’ requested delivery dates and costs, TDK can provide standard GAP products (indicated by "" in the below chart) for
each shape.
Please contact us about other GAP products separately.
Ty p e Frequency
Transformer handling power(W) [Vertical/Horizontal type]
Creepage
distance
0.0mm 2.0mm 2.5mm 3.2mm 4.0mm 5.0mm 6.4mm 8.0mm
ECO2219
50kHz 47 36/32 33/28 30/24 25/18 20/11 13/ 1 4/–
75kHz 69 52/47 48/42 43/34 37/26 29/16 18/ 2 6/–
100kHz 67 51/46 48/41 42/34 36/26 29/16 18/ 2 6/–
ECO2225
50kHz 57 46/43 44/40 40/35 36/30 32/23 25/14 17/3
75kHz 78 64/59 61/54 56/48 50/41 43/32 34/19 23/4
100kHz 77 63/58 60/53 55/47 49/40 43/31 33/18 22/4
ECO2230
50kHz 67 57/54 55/51 52/47 48/42 44/36 37/27 30/18
75kHz 87 75/71 72/67 68/61 63/55 57/47 49/36 39/23
100kHz 86 73/70 71/65 67/60 62/54 56/46 48/35 39/23
Ty p e
Core parameter Bobbin parameter Dimensions Applications
General-
purpose
cores
cores
material
center leg
area
Ae
(mm2)
Bobbin
Ty p e
Spool
width
(mm)
min.
Spool
height
(mm)
min.
Number
of pins
Depth Width Height
D × W × H
STB
Air
condi-
tioner
DVD BD Others
(mm)max.
ECO2219
EER28
EED2820
PC47
family 46.4
Vʯ11.9 4.1 12 23.0 28.5 25.0
ɐɐ
Vʰ11.9 4.1 12 23.0 24.0 25.0
Vʱ11.9 4.1 14 23.0 30.0 25.0
Hʯ11.6 4.3 12 25.0 29.0 24.0
Hʰ11.6 4.3 12 25.0 26.0 24.0
ECO2225
Vʯ17.2 4.1 12 23.0 28.5 31.0
ɐɐ ɐɐɐ
Vʰ17.2 4.1 12 23.0 24.0 31.0
Vʱ17.2 4.1 14 23.0 30.0 31.0
Hʯ16.9 4.3 12 30.5 29.0 24.0
Hʰ16.9 4.3 12 30.5 26.0 24.0
ECO2230
Vʯ22.2 4.1 12 23.0 28.5 36.0
ɐɐ ɐɐɐ
Vʰ22.2 4.1 12 23.0 24.0 36.0
Hʯ21.9 4.3 12 35.5 29.0 24.0
Hʰ21.9 4.3 12 35.5 26.0 24.0
Ty p e AL-value: R20 series(nH/N2)
100 112 125 140 160 180 200 224 250 280 315 400
For multiple outputs
ECO2219 ɐɐɐɐɐɐɐɐɐɐɐ
ECO2225 ɐɐɐɐɐɐɐɐɐɐɐ
ECO2230 ɐɐɐɐɐɐɐɐɐɐɐ
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TRANSFORMERS
ECO22 seriesȁFor Multiple Outputs (Vertical type)
SHAPE & DIMENSIONS
Bobbin type
˖
V
ʯȂ
V
ʰ
RECOMMENDED BASE MATERIAL OPENING SIZE
RECOMMENDED PLANS FOR WINDINGS AND CONNECTIONS
ɑPlease refer to P.26 for more details about the list of plans for standard windings and connections.
Ty p e Bobbin type W max. H max. P
ECO2219 Vʯ28.5 25.0 5.0
Vʰ24.0 25.0 4.0
ECO2225 Vʯ28.5 31.0 5.0
Vʰ24.0 31.0 4.0
ECO2230 Vʯ28.5 36.0 5.0
Vʰ24.0 36.0 4.0
Item Number of secondary circuits
2-connection 3-connection
1st side
1-output
1
2
3
4
5
67
8
9
10
11
12
H max. 3.5±0.8
W max.
23.0max.
12-ø0.8 Dimensions in mm
12
76
1
P±0.1
12-ø1.3 17.5±0.1 Dimensions in mm
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NP1
NB
NS1b
NS1a
A
B6
5
4
x
2
1
7
8
9
10
11
12
NP2
NS1b
NS1a
NP1
NB
NS2
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TRANSFORMERS
ECO22 seriesȁFor Multiple Outputs (Vertical type)
SHAPE & DIMENSIONS
Bobbin type
˖
V
ʱ
RECOMMENDED BASE MATERIAL OPENING SIZE
Ty p e Bobbin type H max.
ECO2219 Vʱ25.0
ECO2225 Vʱ31.0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
H max. 3.5±0.8
30.0max.
23.0max.
14-ø0.8 Dimensions in mm
14
7
6
1
3.75±0.1
14-ø1.3 17.5±0.1 Dimensions in mm
(15/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO22 seriesȁFor Multiple Outputs (Vertical type)
RECOMMENDED PLANS FOR WINDINGS AND CONNECTIONS
ɑPlease refer to P.26 for more details about the list of plans for standard windings and connections.
Item Number of secondary circuits
2-connection 3-connection 4-connection
1st side
1-output
1st side
2-output
6
5
4
x
2
1
7
14
8
9
10
11
12
13
NP
2
NP
1
NB
NS
1b
NS
1a
E
F
6
5
4
x
2
1
7
14
8
9
10
11
12
13
NP
2
NS
1b
NS
1a
NP
1
NB
NS
2
G-1
6
5
4
x
2
1
7
14
8
9
10
11
12
13
NP
2
NP
1
NB
NS
4
NS
3
NS
2
NS
1
H-1
14
13
12
11
x
9
8
7
1
2
3
4
5
6
NP
2
NS
1b
NS
1a
NP
1
NB
1
NB
2
I-1
14
13
12
11
x
9
8
7
1
2
3
4
5
6
NP
2
NS
1b
NS
1a
NP
1
NB
1
NB
2
NS
2
H-2
14
13
12
11
x
9
8
7
1
2
3
4
5
6
NP
2
NS
1b
NS
1a
NP
1
NB
1
NB
2
I-2
14
13
12
11
x
9
8
7
1
2
3
4
5
6
NS
1b
NS
1a
NB
1
NB
2
NS
2
NP
2
NP
1
(16/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO22 seriesȁFor Multiple Outputs (Horizontal type)
SHAPE & DIMENSIONS
Bobbin type
˖
H
ʯȂ
H
ʰ
RECOMMENDED BASE MATERIAL OPENING SIZE
RECOMMENDED PLANS FOR WINDINGS AND CONNECTIONS
ɑPlease refer to P.26 for more details about the list of plans for standard windings and connections.
Ty p e Bobbin type D max. W max. P F
ECO2219 Hʯ25.0 29.0 5.0 20.0
Hʰ25.0 26.0 4.0 20.0
ECO2225 Hʯ30.5 29.0 5.0 25.0
Hʰ30.5 26.0 4.0 25.0
ECO2230 Hʯ35.5 29.0 5.0 30.0
Hʰ35.5 26.0 4.0 30.0
Item Number of secondary circuits
2-connection 3-connection
1st side
1-output
1
2
3
4
5
67
8
9
10
11
12
24.0max. 3.5±0.8
W max.
D max.
12-ø0.8 Dimensions in mm
12
76
1
P±0.1
12-ø1.3 F±0.1 Dimensions in mm
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NP1
NB
NS1b
NS1a
C
D
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NS1b
NS1a
NP1
NB
NS2
(17/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO24 seriesȁ
For multiple outputs
˄
Vertical/Horizontal types
˅
ELECTRICAL CHARACTERISTICS : Recommended range
The Vertical type places its described creepage distance and its half distance on the terminal side and guard side, respectively. The Horizontal type
places its described creepage distance on both sides.
Transformer-handling power may differ depending on switching devices, switching frequency, transformer temperature, conditions during usage, etc.
Therefore, use the handling power for reference only.
STANDARD CORE AL-value
In order to respond to our customers’ requested delivery dates and costs, TDK can provide standard GAP products (indicated by " ɐ" in the below chart) for
each shape.
Please contact us about other GAP products separately.
Ty p e Frequency
Transformer handling power(W) [Vertical/Horizontal type]
Creepage
distance
0.0mm 2.0mm 2.5mm 3.2mm 4.0mm 5.0mm 6.4mm 8.0mm
ECO2420
50kHz 66 50/– 46/– 41/– 35/– 28/– 18/– 6/–
75kHz 85 65/– 60/– 53/– 46/– 36/– 23/– 8/–
100kHz 83 63/– 59/– 52/– 45/– 35/– 22/– 7/–
ECO2425
50kHz 79 64/59 61/54 56/48 50/41 43/32 34/19 23/4
75kHz 96 78/72 74/66 68/59 61/50 53/39 41/23 28/5
100kHz 94 77/71 73/65 67/57 60/49 52/38 40/22 27/5
ECO2430
50kHz 95 81/76 78/72 73/66 68/59 62/51 53/39 43/25
75kHz 107 92/87 88/82 83/75 77/67 70/58 60/44 48/29
100kHz 105 90/85 86/80 81/73 76/66 69/56 59/43 47/28
ECO2425SLD
50kHz 57 –/44 –/40 –/35 –/29 –/22 –/12 —
75kHz 80 –/60 –/55 –/48 –/40 –/31 –/17 —
100kHz 78 –/59 –/54 –/47 –/39 –/30 –/16 —
Ty p e
Core parameter Bobbin parameter Dimensions Applications
General-
purpose
cores
cores
material
center leg
area
Ae
(mm2)
Bobbin
Ty p e
Spool
width
(mm)
min.
Spool
height
(mm)
min.
Number
of pins
Depth Width Height
D × W × H
STB
Air
condi-
tioner
DVD BD Others
(mm)max.
ECO2420
EER28
EER28L
PC47
family 63.8
Vʯ12.1 4.6 12 24.0 28.5 26.5 ɐɐ
Vʰ12.1 4.6 14 25.0 31.5 26.5
ECO2425
Vʯ17.1 4.6 12 24.0 28.5 31.5
ɐɐ ɐɐɐ
Vʰ17.1 4.6 16 25.0 35.5 31.5
Hʯ16.8 4.8 12 30.5 30.0 25.0
Hʰ16.8 4.8 12 30.5 27.0 25.0
ECO2430
Vʯ22.1 4.6 12 24.0 28.5 36.5
ɐɐɐ
Vʰ22.1 4.6 16 25.0 35.5 36.5
Hʯ21.8 4.8 12 36.0 30.0 25.0
Hʰ21.8 4.8 12 36.0 27.0 25.0
ECO2425SLD PC47
family 46.7 Hʯ16.3 4.2 12 30.0 26.0 20.0 ɐɐ ɐɐɐ
Ty p e AL-value: R20 series(nH/N2)
100 112 125 140 160 180 200 224 250 280 315 400
For multiple outputs
ECO2420 ɐɐɐɐɐɐɐɐɐɐɐ
ECO2425 ɐɐɐɐɐɐɐɐɐɐɐ
ECO2430 ɐɐɐɐɐɐɐɐɐɐɐ
ECO2425SLD ɐɐɐɐɐɐɐɐɐ
(18/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO24 seriesȁFor Multiple Outputs (Vertical type)
SHAPE & DIMENSIONS
Bobbin type
˖
V
ʯ
RECOMMENDED BASE MATERIAL OPENING SIZE
RECOMMENDED PLANS FOR WINDINGS AND CONNECTIONS
ɑPlease refer to P.26 for more details about the list of plans for standard windings and connections.
Ty p e Bobbin type H max.
ECO2420 Vʯ26.5
ECO2425 Vʯ31.5
ECO2430 Vʯ36.5
Item Number of secondary circuits
2-connection 3-connection
1st side
1-output
1
2
3
4
5
67
8
9
10
11
12
H max. 3.5±0.8
28.5max.
24.0max.
12-ø0.8 Dimensions in mm
12
76
1
5.0±0.1
12-ø1.3 17.5±0.1 Dimensions in mm
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NP1
NB
NS1b
NS1a
A
B6
5
4
x
2
1
7
8
9
10
11
12
NP2
NS1b
NS1a
NP1
NB
NS2
(19/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO24 seriesȁFor Multiple Outputs (Vertical type)
SHAPE & DIMENSIONS
Bobbin type
˖
V
ʰ
RECOMMENDED BASE MATERIAL OPENING SIZE
Ty p e Bobbin type H max.
ECO2420 Vʰ26.5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
H max. 3.5±0.8
31.5 max.
25.0max.
14-ø0.8 Dimensions in mm
14
7
6
1
4.0±0.1
14-ø1.3 20.0±0.1 Dimensions in mm
(20/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO24 seriesȁFor Multiple Outputs (Vertical type)
RECOMMENDED PLANS FOR WINDINGS AND CONNECTIONS
ɑPlease refer to P.26 for more details about the list of plans for standard windings and connections.
Item Number of secondary circuits
2-connection 3-connection 4-connection
1st side
1-output
1st side
2-output
6
5
4
x
2
1
7
14
8
9
10
11
12
13
NP
2
NP
1
NB
NS
1b
NS
1a
E
F
6
5
4
x
2
1
7
14
8
9
10
11
12
13
NP
2
NS
1b
NS
1a
NP
1
NB
NS
2
G-1
6
5
4
x
2
1
7
14
8
9
10
11
12
13
NP
2
NP
1
NB
NS
4
NS
3
NS
2
NS
1
G-2
6
5
4
x
2
1
7
14
8
9
10
11
12
13
NP
2
NP
1
NB
NS
4
NS
1
NS
3
NS
2
H-1
14
13
12
11
x
9
8
7
1
2
3
4
5
6
NP
2
NS
1b
NS
1a
NP
1
NB
1
NB
2
I-1
14
13
12
11
x
9
8
7
1
2
3
4
5
6
NP
2
NS
1b
NS
1a
NP
1
NB
1
NB
2
NS
2
H-2
14
13
12
11
x
9
8
7
1
2
3
4
5
6
NP
2
NS
1b
NS
1a
NP
1
NB
1
NB
2
I-2
14
13
12
11
x
9
8
7
1
2
3
4
5
6
NS
1b
NS
1a
NB
1
NB
2
NS
2
NP
2
NP
1
(21/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO24 seriesȁFor Multiple Outputs (Vertical type)
SHAPE & DIMENSIONS
Bobbin type
˖
V
ʰ
RECOMMENDED BASE MATERIAL OPENING SIZE
Ty p e Bobbin type H max.
ECO2425 Vʰ31.5
ECO2430 Vʰ36.5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
H max. 3.5±0.8
35.5 max.
25.0max.
16-ø0.8 Dimensions in mm
4.0±0.1 16
8
7
1
16-ø1.3 20.0±0.1 Dimensions in mm
(22/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO24 seriesȁFor Multiple Outputs (Vertical type)
RECOMMENDED PLANS FOR WINDINGS AND CONNECTIONS
ɑPlease refer to P.26 for more details about the list of plans for standard windings and connections.
Item Number of secondary circuits
2-connection 3-connection 4-connection
1st side
1-output
J-1
8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NS
1b
NP
2
NS
1a
NP
1
NB
K-1
8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NP
2
NP
1
NB
NS
2
NS
1b
NS
1a
L-1
8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NP
2
NP
1
NB
NS
4
NS
3
NS
2
NS
1
L-2
8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NP
2
NP
1
NB
NS
4
NS
2
NS
1
NS
3
J-3
8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NS
1b
NP
2
NS
1a
NP
1
NB
K-3
8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NP
2
NP
1
NB
NS
2
NS
1b
NS
1a
L-3
8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NP
2
NP
1
NB
NS
4
NS
3
NS
2
NS
1
L-4
8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NS
3
NS
2
NS
1
NS
3
NP
2
NP
1
NB
(23/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO24 seriesȁFor Multiple Outputs (Vertical type)
RECOMMENDED PLANS FOR WINDINGS AND CONNECTIONS
ɑPlease refer to P.26 for more details about the list of plans for standard windings and connections.
Item Number of secondary circuits
2-connection 3-connection 4-connection
1st side
2-output
M-1
16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP
2
NS
2
NS
1a
NS
1b
NP
1
NB
1
NB
2
N-1
16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP
2
NS
3
NS
2
NP
1
ND
NV
NS
1
M-2
16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP
2
NS
2
NS
1a
NS
1b
NP
1
NB
1
NB
2
N-2
16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP
2
NS
3
NS
2
NP
1
ND
NV
NS
1
M-3
16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP
2
NS
2
NS
1a
NS
1b
NP
1
NB
1
NB
2
N-3
16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NS
3
NS
2
NP
1
NV
NS
1
ND
NP
2
M-4
16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP
2
NS
2
NS
1a
NS
1b
NP
1
NB
1
NB
2
N-4
16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NS
3
NS
2
NP
1
NS
1
NP
2
ND
NV
(24/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO24 seriesȁFor Multiple Outputs (Horizontal type)
SHAPE & DIMENSIONS
Bobbin type
˖
H
ʯȂ
H
ʰ
RECOMMENDED BASE MATERIAL OPENING SIZE
RECOMMENDED PLANS FOR WINDINGS AND CONNECTIONS
ɑPlease refer to P.26 for more details about the list of plans for standard windings and connections.
Ty p e Bobbin type D max. W max. P F
ECO2425 Hʯ30.5 30.0 5.0 25.0
Hʰ30.5 27.0 4.0 25.0
ECO2430 Hʯ36.0 30.0 5.0 30.0
Hʰ36.0 27.0 4.0 30.0
Item Number of secondary circuits
2-connection 3-connection
1st side
1-output
1
2
3
4
5
67
8
9
10
11
12
25.0max. 3.5±0.8
W max.
D max.
12-ø0.8 Dimensions in mm
12
76
1
P±0.1
12-ø1.3 F±0.1 Dimensions in mm
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NP1
NB
NS1b
NS1a
C
D
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NS1b
NS1a
NP1
NB
NS2
(25/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO24 seriesȁ
For Multiple Outputs (Horizontal type) SLD Type
SHAPE & DIMENSIONS
Bobbin type
˖
H
ʯ
RECOMMENDED BASE MATERIAL OPENING SIZE
RECOMMENDED PLANS FOR WINDINGS AND CONNECTIONS
ɑPlease refer to P.26 for more details about the list of plans for standard windings and connections.
Ty p e Bobbin type D max. W max. P F
ECO2425SLD Hʯ30.0 26.0 4.0 25.0
Item Number of secondary circuits
2-connection 3-connection
1st side
1-output
1
2
3
4
5
67
8
9
10
11
12
20.0max. 3.5±0.8
W max.
D max.
12-ø0.8 Dimensions in mm
12
76
1
P±0.1
12-ø1.3 F±0.1 Dimensions in mm
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NP1
NB
NS1b
NS1a
C
D
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NS1b
NS1a
NP1
NB
NS2
(26/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
ECO seriesȁ
List of Plans for Standard Windings and Connections
Item Number of secondary circuits
2-connection 3-connection 4-connection
1st side
1-output
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NP1
NB
NS1b
NS1a
A
B6
5
4
x
2
1
7
8
9
10
11
12
NP2
NS1b
NS1a
NP1
NB
NS2
G-1
6
5
4
x
2
1
7
14
8
9
10
11
12
13
NP2
NP1
NB
NS4
NS3
NS2
NS1
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NP1
NB
NS1b
NS1a
C
D
6
5
4
x
2
1
7
8
9
10
11
12
NP2
NS1b
NS1a
NP1
NB
NS2
G-2
6
5
4
x
2
1
7
14
8
9
10
11
12
13
NP2
NP1
NB
NS4
NS1
NS3
NS2
6
5
4
x
2
1
7
14
8
9
10
11
12
13
NP2
NP1
NB
NS1b
NS1a
E
F
6
5
4
x
2
1
7
14
8
9
10
11
12
13
NP2
NS1b
NS1a
NP1
NB
NS2
(27/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
Item Number of secondary circuits
2-connection 3-connection 4-connection
1st side
1-output
J-1 8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NS1b
NP2
NS1a
NP1
NB
K-1 8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NP2
NP1
NB
NS2
NS1b
NS1a
L-1 8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NP2
NP1
NB
NS4
NS3
NS2
NS1
L-2 8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NP2
NP1
NB
NS4
NS2
NS1
NS3
J-3 8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NS1b
NP2
NS1a
NP1
NB
K-3 8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NP2
NP1
NB
NS2
NS1b
NS1a
L-3 8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NP2
NP1
NB
NS4
NS3
NS2
NS1
L-4 8
9
10
11
12
13
14
15
16
7
6
5
4
x
2
1
NS3
NS2
NS1
NS3
NP2
NP1
NB
(28/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
Item Number of secondary circuits
2-connection 3-connection 4-connection
1st side
2-output
H-1 14
13
12
11
x
9
8
7
1
2
3
4
5
6
NP2
NS1b
NS1a
NP1
NB1
NB2
I-1 14
13
12
11
x
9
8
7
1
2
3
4
5
6
NP2
NS1b
NS1a
NP1
NB1
NB2
NS2
H-2 14
13
12
11
x
9
8
7
1
2
3
4
5
6
NP2
NS1b
NS1a
NP1
NB1
NB2
I-2 14
13
12
11
x
9
8
7
1
2
3
4
5
6
NS1b
NS1a
NB1
NB2
NS2
NP2
NP1
M-116
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP2
NS2
NS1a
NS1b
NP1
NB1
NB2
N-1 16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP2NS3
NS2
NP1
ND
NV
NS1
M-216
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP2
NS2
NS1a
NS1b
NP1
NB1
NB2
N-2 16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP2NS3
NS2
NP1
ND
NV
NS1
(29/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
Item Number of secondary circuits
2-connection 3-connection 4-connection
1st side
2-output
M-316
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP2
NS2
NS1a
NS1b
NP1
NB1
NB2
N-3 16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NS3
NS2
NP1
NV
NS1
ND
NP2
M-416
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NP2
NS2
NS1a
NS1b
NP1
NB1
NB2
N-4 16
15
14
13
x
11
10
9
8
1
2
3
4
5
6
7
NS3
NS2
NP1
NS1
NP2
ND
NV
(30/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
Design Reference for Switching Power Transformers
• Maximum allowable temperature
The maximum ambient temperature of the transformer is E Class
(120°C).
However, there is no E Class for transformers shipped for North
America; therefore, the maximum ambient temperature is Class
105 (105°C). [Class 130 (130°C) is possible when UL1446 insulat-
ing system is applied.]
• Temperature rise in Transformers
In normal design condition, 55°C or less (using the resistance
method) is the target of temperature rise of windings. Therefore,
the maximum ambient temperature at this time is 65°C (50°C max.
for North America).
In case of measuring the temperature of the windings by thermo-
couple, 10 to 15°C more would be allowable.
• Dealing with safety regulations
Designs are made in consideration of materials, structures an so
on that the designed transformers are comply with designated
safety regulations.
(1)Regarding the core
To be handled in the same manner as Basic Insulation.
(2)Distance between transformer and other parts
Please keep the distance between the transformer and other
parts in according with applicable safety standards.
• Concerning of the influence of leakage flux
Due to the fact that there is always some degree of leakage flux
from transformer, designs should be made to keep them apart as
much as possible from parts that are easily affected by this.
• Magnetic saturation of the core
(1)Magnetic operating condition of the core in the transformer are
determined by maximum operation temperature (including tem-
perature rise) and driving condition in circuits. If product is used
in condition that exceed these conditions, there is a possibility of
occurring magnetic saturation of the core. The following items
could be possible cause of core saturation.
• The product is used in conditions that exceed the maximum
operating temperature.
• Operating frequencies are lower than the ones initially
designed. (longer ON time)
• The input voltage is abnormally higher than the specified val-
ues.
(2)To check on the saturation of the core it is possible to judge from
current waveforms of primary winding. Current flowing in the
inductor changes in a straight line in relation to time as in the fig-
ure a) in accordance with
However, in the event that a saturation phenomena has occurred
in the core, inductance is reduced causing a rapid and drastic
increase of current as shown figure b).
(3)In this case, there is possibility that a breakdown may occur due
to surpassing the rated current of the switch it is necessary to
have over current protection circuit or modify transformer design.
• Circuit topologies of switching power supply
The term “topology” refers to the arrangement of the power com-
ponents within the switching power supply design. There are sev-
eral different kind of circuit topologies as following;
l= uT.
E
L
+E
Ip
Lp
a)- Normal b)- Saturation phenomena
<In the case of flyback>
Voltage resonance type, current
resonance type
Resonance mode
ON/OFF mode
Self-excited flyback system
(RCC system, pseudo resonance system)
Separately-excited flyback system
(PWM system, PFM system)
Chopper type
(step-down type, step-up type, step-up/
step-down type)
ON/ON mode
Forward converter
Push-Pull converter
Half and Full-Bridge converter
(31/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
• Which topology of switching power supply to use?
Each topology has its relative merit in terms of cost and perfor-
mance. One topology may have a low parts cost but only be able to
provide a limited amount of power; another may have ample power
capability but cost more, and so on.
The following relationship between output voltage and power give
us one suggestion when we need to chose topology in given condi-
tions;
• The deference of power conversion between Forward and
Flyback modes.
Since the forward mode converter is a system that performs power
transmission to the output side during ON period of switching tran-
sistor, it is possible to work with the large output current. Conse-
quently, forward converter method is suitable to large current
output with relatively lower output voltage.
To the contrary, Flyback mode converter is a system that input
power is stored within the Inductor or primary coil in the trans-
former as a magnetic energy during ON period of switching tran-
sistor and the stored energy transmit to output side during OFF
period of switching transistor. Accordingly, Flyback mode converter
is suitable to high voltage and low current output, and does not
suite to large current output.
• The stored energy within the inductor.
when Ip is a triangular wave,
and electric power (energy per unit time) is
Where,
Lp: Inductance of primary winding
Ip: Peak value of primary current
f: Switching frequency
• How to decide primary inductance (Lp)?
(1) When the self-excited flyback system is selected:
it is possible to calculate the inductance value needed for the
desired output P under the fixed Ip value.
By deriving EuTon =LPui from the formula
the current which flows through the inductor becomes .
By substituting this with P= ...., the formula of
Where,
E: Input voltage
Ton: On time
F: Switching frequency
In actual designs this value is to be slightly lowered in consider-
ation of the transformer’s efficiency.
(2) When the separately-excited flyback system is selected:
The coefficient k is added because a direct current is superim-
posed on the primary current waveform.
The primary current waveforms
The self-excited flyback system(RCC)
The separately-excited flyback system
Energy stored in the inductor Lp is W= 1uLPuIP2u[J]
2
P= [J] =1 uLPuIP2uf[W]
[S] 2
ON-OFF type
ON-OFF type and
ON-ON type
(1-transistor type forward)
ON-ON type
(Multi-transistor type)
0
0
10
100
1000
10 100 1000
Output power(W)
Output voltage(V)
ON-OFF type: For high voltage/small current
ON-ON type: For low voltage/large current
E
Ip
Lp
+V0
Using the formula P= 1 uLPuIP2uf[W],
2
E=LPudi ,
dt
P= 1uLPuEuTon uf= 1uE2uTon2 uf results.
2L
P2LP
From this, the formula LP=E2uTon2
u f results.
2uP
LP=E2uTon2
ufu(1+k)
2uP(1–k)
i= EuTon
LP
(
)
2
Ton
Ip
ΔI
T
T
on
Ip
kIp
ΔI
T
(32/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
• How to decide number of turns of primary winding?
Where,
E min.: Lower limit value of input voltage (Vdc)
A: Core cross section area (m2)
D: Duty ratio
Ton max.: The maximum ON time for switching transistor (sec.)
': Operating flux density (T)
(1) When the self-excited flyback system is selected:
(2) When the separately-excited flyback system is selected:
Precautions must be taken as the upper limit value of 'B
changes according to core materials, operating temperatures,
frequencies, etc.
• Determining of secondary winding
ON-OFF mode
As it is necessary to consider the voltage drop of the rectifier diode
on the secondary side,
Where,
Vf: Voltage drop of the rectifier diode
Vo : Output voltage
• Example of drive waveforms
(1) When the self-excited flyback system is selected (RCC)
(2) When the separately-excited flyback system is selected
• In order for designing the transformer, the following condi-
tions are necessary.
It is greatly appreciated customer give us those conditions by filling
out required information with the appended “Transformer specifica-
tions / inquiry form”.
(1)Circuit topology
Flyback system, forward system, etc.
(2) Used IC
Design with a high degree of perfection is possible when IC
manufacturer and model number information are provided.
(3)Input voltage range
The lower limit of rectified voltage is important, in particular.
(4) Operating frequency (fixed/variable)
It is especially necessary to determine the lower limit frequency
for the maximum load condition in Flyback converter.
(5) Maximum duty ratio
It is necessary to specify maximum ON time when input voltage
is lower limit, approximately 45% should be the maximum for
external excitation system.
(6)Operating temperature range,maximum temperature rise
This is the allowable temperature rise in the transformer, should be
equal to the value that ambient temperature has been taken from
the temperature index of the materials which is 120°C(105°C in UL
system).
(7)Required safety regulations
Structures and materials are chosen to comply with required
safety regulations.
(8)Output voltage/current
Required for determination of the winding ratios and wire gage.
(9) Transformer outside dimension
It is necessary for determining the shape.
(10)Instructions concerning circuit designs and pin configuration of
transformer
Type of the secondary rectifier diode is important in particular
because of voltage drop between First recovery and Schottky
barrier type is different, it will affect to design of number of turns
of transformer.
NP=E min.uTon max.
'BuAu(1–k)
NP=E min.uTon max. (Ton max.= D )
'BuAf
NP=E min.uTon max.
'BuAu(1–k)
NS=NPuVo+VFu1–D
E min. D
Ton max. =D : Duty ratio
1/f
t
t
VCE
iC
ton toff
Tr
R
RS
RB
n1 n2
nB
D
iC
Vi
R
n1 : n2
D
iQ
Q
PWM
Vi
t
t
VQ
iC
ton toff
(33/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
Transformer for Switching Regulator Specification Request Form(For Flyback Converter)
2. Department, applicant's name(Including the sample-sending destination)
4. Input specifications
10.
Desired core size and outer dimensions of transformer
11. Safety standard compliance
12. Safety distance (Please enter the distance prescribed by the company.)
13. Withstand voltage (Please enter the voltage prescribed by the company.)
14. Please Enter the Power Devices to be Used.
In addition, if there are recommended transformer specifications, etc., presented by the device manufacturer, please attach these separately.
15. Mass production and prototyping information
Secondary - secondary: AC (V)(
min)(
mA)
Primary - secondary: AC (V)(
min)(
mA)AC (V)(
min)(
mA)
Primary - core:
Primary - primary: AC (V)(
min)(
mA)AC (V)(
min)(
mA)
Secondary - core:
7. Max. duty or max. ON time D max. (%), T max. (s)
Outer dimensions of the transformer L x W x H mm max.Core size
Primary - secondary: mm or greater Primary - primary: mm or greater Primary - core: mm or greater
Secondary - secondary: mm or greater Secondary - core: mm or greater
17. If there are any other requests (priorities in the company, size or price, etc.) or alterable items, please provide a description.
TDK-EPC Corporation Magnetics Business Group, Business Promotions Dept.
3-9-1, Shibaura, Minato-ku Tokyo 108-0023, Japan TEL: 81-3-6852-7229, FAX: 81-3-6852-7159
Necessity for local contents Necessary (manufactured by ) Not necessary
Final set name: Mass production requested price/currency:
Acceptance conditions of the above price, delivery location (FOB CHN, CIF LA. , DDP Paris, etc.)
Mass production: Mass production quantity pcs. /M Mass production start timeMass production location
Prototyping time: Approval locationTest production1 Test production2 Test production for Mass production
16. Required sample quantity pcs. Requested delivery time:
AC input voltage: Rated Operating range:
(V) to (V)(V) to (V)
DC input voltage: Rated Operating range:
(V) to (V)(V) to (V)
1. Company name
Address
TEL/FAX:
Name:
E-mail:
3. Circuit system
8. Input capacitor capacitance CIN (μF)
(If not specified, design will be performed using a value of ( )μFx4, which is times greater than the output power for 100V and worldwide transformers, and an output power of ( )μF for 200V transformers.)
Product No.:Manufacturer name:
Application for a single item purchase Yes Set purchase No (Please bear in mind that the application fee may be borne by the customer.)
6. Clock frequency ( Flexible / Fixed) fsw to (kHz)
5. Output voltage/Current/Diode used (diode voltage drop)
(Rectifier diode F.R.D: First Recovery Diode, S.B.D: Schottky Barrier Diode)
Output specifications
Output voltage(V)
(Accuracy)
Minimum
Maximum time
Peak time
Primary/Secondary
Feedback
Rectifier diode
VCC
Power application
Output1 Output2 Output3 Output6 Output7Output4 Output5
VF(V)
Typical ΔT measuring condition
Example
Motor
50V
(
±5V
)
No
0.1
FRD
Secondary
0
2A, 3sec.
1A,10sec.
0.8
Output Current(A)
・Request for connection method Yes No (When checking "Yes", please attach a drawing separately.) ・Pin assignments changes Possible Impossible
Pollution degree 1 2 3 (If not specified, design will be performed with a pollution degree of 2.)
Insulation type Basic insulation Reinforced insulation Double insulation Other ( )
9.
Operating temperature range, max. temperature rise, and ambient temperature
to (°C) ΔT(°C Typ. Max.) °C
Ambient temperature
Prototype No:
Person in Charge from Sales Dep.:
Person in Charge from Sales Promotion Dep.: Recorded Date / /
Recorded Date / /
Recorded Date / /
Electrical Appliance and Material Safety Law Others CSA IEC UL
Standard
Issued on / /
(34/34)
001-01 / 20140425 / trans_switching-power_eco_en.fm
• All specifications are subject to change without notice.
TRANSFORMERS
Issued on / /
Transformer for Switching Regulator Specification Request Form(For Home Appliances)
2. Department, applicant's name(Including the sample-sending destination)
TDK-EPC Corporation Magnetics Business Group, Business Promotions Dept.
3-9-1, Shibaura, Minato-ku Tokyo 108-0023, Japan TEL: 81-3-6852-7229, FAX: 81-3-6852-7159
1. Company name
Address
TEL/FAX:
Name:
E-mail:
3. Circuit system Prototype No:
Person in Charge from Sales Dep.:
Person in Charge from Sales Promotion Dep.: Recorded Date / /
Recorded Date / /
Recorded Date / /
□Flyback method  □Forward method  □Others
(Rectifier diode F.R.D: First Recovery Diode, S.B.D: Schottky Barrier Diode)
5. Input/output condition
Input min. Vac max. Vac
min. Vdc max. Vdc
or
Frequency Hz
Current(A)typ.
⊿T measuring condition
Diode
forward voltage VF(V)
Current(A)max.
Specifications Primary/Secondary
output Feedback Voltage(V)
Output1
Output2
Output3
Output4
Output5
Output6
Example1
Example2
Motor
IC Vcc
Secondary
Primary
Yes
No
50V(±5V)
15V(±2V)
0.8A
0.05A
1.0A(10sec.)
0.05A
0.7V(SBD)
1.0V(FRD)
(If not specified, design will be made according to the optimal size determined by our company.)
6. Outer dimensions of the transformer
Max. height x L x W mm max.
4. IC used
IC maker IC model No.
□Fixed frequency method (PWM)   □Variable frequency method(RCC)
Or Max. on-time
Other input capacitor
Max. duty % μS
kHz to kHzDrive frequency
μF
IC drive method
(If not specified, design will be performed using a value of ( )μFx4, which is times greater than the output power for 100V and worldwide transformers, and an output power of ( )μF for 200V transformers.)
11. Request Items (Enter any items that you would like to request such as priority conditions, size, price, or adjustable items.)
7. Environment
Operating temperature range
°C °C
Max. temperature rise
°C
to
°C
Ambient temperature (Please enter the ambient temperature. If not entered, design will be made using the thermocouple method (C.C.))
8. Safety standard compliance
Standard
Insulation type □Basic insulation □Reinforced insulation
Pollution degree □ 1   □ 2  □ 3 (If not specified, design will be performed with a pollution degree of 2.)
□Electrical Appliances and Material Safety Act, Appendix 8 □UL60335-1 □IEC 60335-1 Ed4
Safety distance Primary - secondary : mm
Primary - core : mm
Secondary - secondary : mm
mmPrimary - primary :
mm
Secondary - core :
Reference: creeping distance standard
9. Withstand voltage
Primary - secondary : Vac min Secondary - secondary : Vac minVac minPrimary - primary :
Vac minPrimary - core : Vac minSecondary - core :
(Please enter the distance prescribed by the company.)
(Please enter the distance prescribed by the company.)
10. Mass production and prototyping information
Necessary samples Amount Requested delivery time:
Plan Test production1 Test production2 Test production for Mass production Mass production
Final set name: Asking price Planned amount
Approval location Delivery location Business terms CIF-
Applicable safety standards Electrical appliances and material safety act IEC60335-1
Appendix 8 Ed.4
Insulation class Base Enhancement
Ground voltage or
line voltage (V)
50 < x ≦ 150
150 < x ≦ 300
125 < x ≦ 250
250 < x ≦ 400
Operating voltage (V)
Base
2.0
2.5
Enhancement
4.0
5.0 Ⅰ
Pollution level2 CTI Pollution level2 CTI
ⅡⅢa/b ⅠⅡ
Ⅲa/b
・Request for connection method Yes No (When checking "Yes", please attach a drawing separately.) ・Pin assignments changes Possible Impossible
−
2.0
2.5
4.0
−
4.0
5.0
8.0
−
−
−
−
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