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

LTSpice files

LT
LTSpice_WE-FLEX (rev23a).zip
|
337.3 KB

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	Downloads	Status	L_BASE (µH)	I_{R BASE} (A)	I_{SAT BASE} (A)	n	V_T (V (AC))	∫Udt _Base (µVs)	R_{DC BASE} (mΩ)	Size	Type
749196540	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196540 (rev1).igs \| 2.1 MB STP 749196540 (rev1).stp \| 686.5 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	3.4	1.91	4.18	1:1:1:1:1:1	500	65.6	30	EFD20	gapped
749196530	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196530 (rev1).igs \| 2.1 MB STP 749196530 (rev1).stp \| 686.5 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	4.3	1.91	2.91	1:1:1:1:1:1	500	65.6	30	EFD20	gapped
749196520	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196520 (rev1).igs \| 2.1 MB STP 749196520 (rev1).stp \| 686.5 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	5.3	1.91	2.53	1:1:1:1:1:1	500	65.6	30	EFD20	gapped
749196241	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196241 (rev1).igs \| 2.8 MB STP 749196241 (rev1).stp \| 803.2 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	6.6	0.95	1.55	1:1:1:1:1:1	500	48.3	159	ER14.5/6	gapped
749196541	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196541 (rev1).igs \| 2.1 MB STP 749196541 (rev1).stp \| 686.5 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	7.6	1.7	2.46	1:1:1:1:1:1	500	98.4	71.1	EFD20	gapped
749196341	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196341 (rev1).igs \| 2 MB STP 749196341 (rev1).stp \| 584.9 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	7.9	0.97	1.33	1:1:1:1:1:1	500	39.8	140	EFD15	gapped
749196231	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196231 (rev1).igs \| 2.8 MB STP 749196231 (rev1).stp \| 803.2 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	8.3	0.95	1.2	1:1:1:1:1:1	500	48.3	159	ER14.5/6	gapped
749196141	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196141 (rev1).igs \| 1.2 MB STP 749196141 (rev1).stp \| 341.3 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	8.5	0.55	0.96	1:1:1:1:1:1	500	32.9	344	ER11/5	gapped
749196331	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196331 (rev1).igs \| 2 MB STP 749196331 (rev1).stp \| 584.9 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	9.3	0.97	1.09	1:1:1:1:1:1	500	39.8	140	EFD15	gapped
749196531	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196531 (rev1).igs \| 2.1 MB STP 749196531 (rev1).stp \| 686.5 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	9.7	1.7	2.2	1:1:1:1:1:1	500	98.4	71.1	EFD20	gapped
749196510	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196510 (rev1).igs \| 2.1 MB STP 749196510 (rev1).stp \| 686.5 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	9.9	1.91	1.17	1:1:1:1:1:1	500	65.6	30	EFD20	gapped
749196131	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196131 (rev1).igs \| 1.2 MB STP 749196131 (rev1).stp \| 341.3 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	10.9	0.55	0.73	1:1:1:1:1:1	500	32.9	344	ER11/5	gapped
749196221	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196221 (rev1).igs \| 2.8 MB STP 749196221 (rev1).stp \| 803.2 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	11.6	0.95	0.84	1:1:1:1:1:1	500	48.3	159	ER14.5/6	gapped
749196521	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196521 (rev1).igs \| 2.1 MB STP 749196521 (rev1).stp \| 686.5 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	12	1.7	1.73	1:1:1:1:1:1	500	98.4	71.1	EFD20	gapped
749196321	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196321 (rev1).igs \| 2 MB STP 749196321 (rev1).stp \| 584.9 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	14.2	0.97	0.63	1:1:1:1:1:1	500	39.8	140	EFD15	gapped
749196121	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196121 (rev1).igs \| 1.2 MB STP 749196121 (rev1).stp \| 341.3 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	14.7	0.55	0.54	1:1:1:1:1:1	500	32.9	344	ER11/5	gapped
749196211	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196211 (rev1).igs \| 2.8 MB STP 749196211 (rev1).stp \| 803.2 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	21.6	0.95	0.36	1:1:1:1:1:1	500	48.3	159	ER14.5/6	gapped
749196511	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196511 (rev1).igs \| 2.1 MB STP 749196511 (rev1).stp \| 686.5 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	22.3	1.7	0.49	1:1:1:1:1:1	500	98.4	71.1	EFD20	gapped
749196311	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196311 (rev1).igs \| 2 MB STP 749196311 (rev1).stp \| 584.9 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	23.3	0.97	0.33	1:1:1:1:1:1	500	39.8	140	EFD15	gapped
749196111	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196111 (rev1).igs \| 1.2 MB STP 749196111 (rev1).stp \| 341.3 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	27.4	0.55	0.22	1:1:1:1:1:1	500	32.9	344	ER11/5	gapped
749196500	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196500 (rev1).igs \| 2.1 MB STP 749196500 (rev1).stp \| 686.5 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	87.1	1.91	0.03	1:1:1:1:1:1	500	65.6	30	EFD20	ungapped
749196201	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196201 (rev1).igs \| 2.8 MB STP 749196201 (rev1).stp \| 803.2 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	140	0.95	0.02	1:1:1:1:1:1	500	48.3	159	ER14.5/6	ungapped
749196301	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196301 (rev1).igs \| 2 MB STP 749196301 (rev1).stp \| 584.9 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	153.8	0.97	0.02	1:1:1:1:1:1	500	39.8	140	EFD15	ungapped
749196501	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196501 (rev1).igs \| 2.1 MB STP 749196501 (rev1).stp \| 686.5 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	196	1.7	0.02	1:1:1:1:1:1	500	98.4	71.1	EFD20	ungapped
749196101	SPEC	7 files EDA models: Components ZIP ALT WE-FLEX (rev24a).IntLib \| 421 KB CDS Cadence_WE-FLEX (rev24a).zip \| 3.5 MB EAG Eagle_WE-FLEX (rev24a).lbr \| 77.5 KB ZUK Download_Cadstar_WE-FLEX (rev19a).zip \| 11.4 KB CAD files ZIP IGS 749196101 (rev1).igs \| 1.2 MB STP 749196101 (rev1).stp \| 341.3 KB Electric models ZIP LT LTSpice_WE-FLEX (rev23a).zip \| 337.3 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	198.6	0.55	0.01	1:1:1:1:1:1	500	32.9	344	ER11/5	ungapped

	Order Code	Datasheet
	749196540	SPEC
	749196530	SPEC
	749196520	SPEC
	749196241	SPEC
	749196541	SPEC
	749196341	SPEC
	749196231	SPEC
	749196141	SPEC
	749196331	SPEC
	749196531	SPEC
	749196510	SPEC
	749196131	SPEC
	749196221	SPEC
	749196521	SPEC
	749196321	SPEC
	749196121	SPEC
	749196211	SPEC
	749196511	SPEC
	749196311	SPEC
	749196111	SPEC
	749196500	SPEC
	749196201	SPEC
	749196301	SPEC
	749196501	SPEC
	749196101	SPEC

Samples

	Order Code	Datasheet	Downloads	Status	L_BASE (µH)	I_{R BASE} (A)	I_{SAT BASE} (A)	n	V_T (V (AC))	∫Udt _Base (µVs)	R_{DC BASE} (mΩ)	Size	Type	Samples

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.

LTSpice files

Characteristics

Applications

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