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WE-FLEX Flexible Transformer for DC/DC Converter

Size Dimen­sions 3DL
(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 Data­sheet DownloadsLBASE
(µH)
nIR BASE
(A)
ISAT BASE
(A)
TypeRDC BASE
(mΩ)
∫Udt Base
(µVs)
LS Base
(µH)
VT
(V (AC))
SizeDesign Kit Samples
749196540SPEC
6 files 3.4 1:1:1:1:1:1 1.91 4.18 gapped 30 65.6 0.18 500 EFD20749196
749196530SPEC
6 files 4.3 1:1:1:1:1:1 1.91 2.91 gapped 30 65.6 0.18 500 EFD20749196
749196520SPEC
6 files 5.3 1:1:1:1:1:1 1.91 2.53 gapped 30 65.6 0.18 500 EFD20749196
749196241SPEC
6 files 6.6 1:1:1:1:1:1 0.95 1.55 gapped 159 48.3 0.17 500 ER14.5/6749196
749196541SPEC
6 files 7.6 1:1:1:1:1:1 1.7 2.46 gapped 71.1 98.4 0.24 500 EFD20749196
749196341SPEC
6 files 7.9 1:1:1:1:1:1 0.97 1.33 gapped 140 39.8 0.13 500 EFD15749196
749196231SPEC
6 files 8.3 1:1:1:1:1:1 0.95 1.2 gapped 159 48.3 0.17 500 ER14.5/6749196
749196141SPEC
6 files 8.5 1:1:1:1:1:1 0.55 0.96 gapped 344 32.9 0.21 500 ER11/5749196
749196331SPEC
6 files 9.3 1:1:1:1:1:1 0.97 1.09 gapped 140 39.8 0.13 500 EFD15749196
749196531SPEC
6 files 9.7 1:1:1:1:1:1 1.7 2.2 gapped 71.1 98.4 0.24 500 EFD20749196
749196510SPEC
6 files 9.9 1:1:1:1:1:1 1.91 1.17 gapped 30 65.6 0.18 500 EFD20749196
749196131SPEC
6 files 10.9 1:1:1:1:1:1 0.55 0.73 gapped 344 32.9 0.21 500 ER11/5749196
749196221SPEC
6 files 11.6 1:1:1:1:1:1 0.95 0.84 gapped 159 48.3 0.17 500 ER14.5/6749196
749196521SPEC
6 files 12 1:1:1:1:1:1 1.7 1.73 gapped 71.1 98.4 0.24 500 EFD20749196
749196321SPEC
6 files 14.2 1:1:1:1:1:1 0.97 0.63 gapped 140 39.8 0.13 500 EFD15749196
749196121SPEC
6 files 14.7 1:1:1:1:1:1 0.55 0.54 gapped 344 32.9 0.21 500 ER11/5749196
749196211SPEC
6 files 21.6 1:1:1:1:1:1 0.95 0.36 gapped 159 48.3 0.17 500 ER14.5/6749196
749196511SPEC
6 files 22.3 1:1:1:1:1:1 1.7 0.49 gapped 71.1 98.4 0.24 500 EFD20749196
749196311SPEC
6 files 23.3 1:1:1:1:1:1 0.97 0.33 gapped 140 39.8 0.13 500 EFD15749196
749196111SPEC
6 files 27.4 1:1:1:1:1:1 0.55 0.22 gapped 344 32.9 0.21 500 ER11/5749196
749196500SPEC
6 files 87.1 1:1:1:1:1:1 1.91 0.03 ungapped 30 65.6 0.18 500 EFD20749196
749196201SPEC
6 files 140 1:1:1:1:1:1 0.95 0.02 ungapped 159 48.3 0.17 500 ER14.5/6749196
749196301SPEC
6 files 153.8 1:1:1:1:1:1 0.97 0.02 ungapped 140 39.8 0.13 500 EFD15749196
749196501SPEC
6 files 196 1:1:1:1:1:1 1.7 0.02 ungapped 71.1 98.4 0.24 500 EFD20749196
749196101SPEC
6 files 198.6 1:1:1:1:1:1 0.55 0.01 ungapped 344 32.9 0.21 500 ER11/5749196
Order Code Data­sheet
749196540SPEC
749196530SPEC
749196520SPEC
749196241SPEC
749196541SPEC
749196341SPEC
749196231SPEC
749196141SPEC
749196331SPEC
749196531SPEC
749196510SPEC
749196131SPEC
749196221SPEC
749196521SPEC
749196321SPEC
749196121SPEC
749196211SPEC
749196511SPEC
749196311SPEC
749196111SPEC
749196500SPEC
749196201SPEC
749196301SPEC
749196501SPEC
749196101SPEC
Samples
Order Code Data­sheet DownloadsLBASE
(µH)
nIR BASE
(A)
ISAT BASE
(A)
TypeRDC BASE
(mΩ)
∫Udt Base
(µVs)
LS Base
(µH)
VT
(V (AC))
SizeDesign 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.