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WE-FLEX Flexible Transformer for DC/DC Converter

Size L
(mm)
W
(mm)
H
(mm)
ER11/5 12.9 13 6.2
ER14.5/6 16.3 16.8 7.4
EFD15 17.5 22.1 8.3
EFD20 21 29.5 10.8

Characteristics

  • Transformer with 6 identical windings
  • 4 sizes with 5 different lengths of air gap each
  • Isolation voltage 500 VDC
  • Low leakage inductance
  • Operating temperature: –40 ºC to +125 ºC
  • By using different circuits more than 375 transformer solutions and about 125 choke solutions possible. Consequently, quick prototyping possibilities

Applications

  • All kind of switching regulators
    - Flyback converters
    - Forward converters
    - Push-pull converters
    - Step-up/step-down converters
    - SEPIC converter

Products

All
ER11/5
ER14.5/6
EFD15
EFD20
Order Code SPEC Downloads LBASE
(µH)
n IR BASE
(A)
ISAT BASE
(A)
RDC BASE
(mΩ)
∫Udt Base
(µVs)
LS Base
(µH)
VT
(V (AC))
Design Kit Samples
749196540
STE ALT EAG CAD LTS IGS CAD CAD 3.4 1:1:1:1:1:1 1.91 4.18 30 65.6 0.18 500 749196
749196530
STE ALT EAG CAD LTS IGS CAD CAD 4.3 1:1:1:1:1:1 1.91 2.91 30 65.6 0.18 500 749196
749196520
STE ALT EAG CAD LTS IGS CAD CAD 5.3 1:1:1:1:1:1 1.91 2.53 30 65.6 0.18 500 749196
749196241
STE ALT EAG CAD LTS IGS CAD CAD 6.6 1:1:1:1:1:1 0.95 1.55 159 48.3 0.17 500 749196
749196541
STE ALT EAG CAD LTS IGS CAD CAD 7.6 1:1:1:1:1:1 1.7 2.46 71.1 98.4 0.24 500 749196
749196341
STE ALT EAG CAD LTS IGS CAD CAD 7.9 1:1:1:1:1:1 0.97 1.33 140 39.8 0.13 500 749196
749196231
STE ALT EAG CAD LTS IGS CAD CAD 8.3 1:1:1:1:1:1 0.95 1.2 159 48.3 0.17 500 749196
749196141
STE ALT EAG CAD LTS IGS CAD CAD 8.5 1:1:1:1:1:1 0.55 0.96 344 32.9 0.21 500 749196
749196331
STE ALT EAG CAD LTS IGS CAD CAD 9.3 1:1:1:1:1:1 0.97 1.09 140 39.8 0.13 500 749196
749196531
STE ALT EAG CAD LTS IGS CAD CAD 9.7 1:1:1:1:1:1 1.7 2.2 71.1 98.4 0.24 500 749196
749196510
STE ALT EAG CAD LTS IGS CAD CAD 9.9 1:1:1:1:1:1 1.91 1.17 30 65.6 0.18 500 749196
749196131
STE ALT EAG CAD LTS IGS CAD CAD 10.9 1:1:1:1:1:1 0.55 0.73 344 32.9 0.21 500 749196
749196221
STE ALT EAG CAD LTS IGS CAD CAD 11.6 1:1:1:1:1:1 0.95 0.84 159 48.3 0.17 500 749196
749196521
STE ALT EAG CAD LTS IGS CAD CAD 12 1:1:1:1:1:1 1.7 1.73 71.1 98.4 0.24 500 749196
749196321
STE ALT EAG CAD LTS IGS CAD CAD 14.2 1:1:1:1:1:1 0.97 0.63 140 39.8 0.13 500 749196
749196121
STE ALT EAG CAD LTS IGS CAD CAD 14.7 1:1:1:1:1:1 0.55 0.54 344 32.9 0.21 500 749196
749196211
STE ALT EAG CAD LTS IGS CAD CAD 21.6 1:1:1:1:1:1 0.95 0.36 159 48.3 0.17 500 749196
749196511
STE ALT EAG CAD LTS IGS CAD CAD 22.3 1:1:1:1:1:1 1.7 0.49 71.1 98.4 0.24 500 749196
749196311
STE ALT EAG CAD LTS IGS CAD CAD 23.3 1:1:1:1:1:1 0.97 0.33 140 39.8 0.13 500 749196
749196111
STE ALT EAG CAD LTS IGS CAD CAD 27.4 1:1:1:1:1:1 0.55 0.22 344 32.9 0.21 500 749196
749196500
STE ALT EAG CAD LTS IGS CAD CAD 87.1 1:1:1:1:1:1 1.91 0.03 30 65.6 0.18 500 749196
749196201
STE ALT EAG CAD LTS IGS CAD CAD 140 1:1:1:1:1:1 0.95 0.02 159 48.3 0.17 500 749196
749196301
STE ALT EAG CAD LTS IGS CAD CAD 153.8 1:1:1:1:1:1 0.97 0.02 140 39.8 0.13 500 749196
749196501
STE ALT EAG CAD LTS IGS CAD CAD 196 1:1:1:1:1:1 1.7 0.02 71.1 98.4 0.24 500 749196
749196101
STE ALT EAG CAD LTS IGS CAD CAD 198.6 1:1:1:1:1:1 0.55 0.01 344 32.9 0.21 500 749196
Order Code SPEC
749196540
749196530
749196520
749196241
749196541
749196341
749196231
749196141
749196331
749196531
749196510
749196131
749196221
749196521
749196321
749196121
749196211
749196511
749196311
749196111
749196500
749196201
749196301
749196501
749196101
Samples
Order Code SPEC Downloads LBASE
(µH)
n IR BASE
(A)
ISAT BASE
(A)
RDC BASE
(mΩ)
∫Udt Base
(µVs)
LS Base
(µH)
VT
(V (AC))
Design Kit Samples

Assortments

Articles from this product series can be found in the following assortments:

Comments

  • The WE-FLEX series of transformers consist of 6 independent windings which can be connected on the board as required. The 25 transformers facilitate more than 500 transformer and choke variants. The transformers still show an outstandingly low level of leakage inductance. Parts without airgap are especially designed for buck derived topologies like forward or push-pull converters. The high flexibility of the transformers allows developers to realize their own transformers without having to resort to a customer-specific transformer. Power levels of between 1 and 50 Watts can be transformed with the WE-FLEX series transformers. They can be used at switching frequencies of up to 1 MHz.