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EFD 20/10/7 Core
I E core with flattened, lower center leg
B66417
for especially flat transformer design
I For DC/DC converters I EFD cores are supplied as single units
Magnetic characteristics (per set)
l/A le Ae A min Ve
= 1,52 mm-1 = 47 mm = 31 mm2 = 31 mm2 = 1 460 mm3
Approx. weight 7,2 g/set
Ungapped Material N49 N87 AL value nH
e
A L1min P V nH W/set
Ordering code
910 + 30/- 20 % 1100 750 1200 + 30/- 20 % 1440 660
B66417-G-X149 < 0,29 (50 mT, 500 kHz, 100 C) < 1,05 B66417-G-X187 (200 mT, 100 kHz, 100 C)
Gapped Material N87 AL value nH 100 10 % 160 10 %
e
120 193
g approx. mm 0,49 0,25
Ordering code B66417-U100-K187 B66417-U160-K187
The A L value in the table applies to a core set comprising one ungapped core (dimension g = 0) and one gapped core (dimension g > 0).
Calculation factors (for formulas, see "E cores: general information", page 382) Material Relationship between air gap - A L value K1 (25 C) N87 Validity range: 61,1 K2 (25 C) - 0,699 Calculation of saturation current K3 (25 C) 85,4 K4 (25 C) - 0,796 K3 (100 C) K4 (100 C) 75,7 - 0,873
K1, K2: 0,10 mm < s < 1,40 mm K3, K4: 50 nH < A L < 410 nH 510 08/01
EFD 20/10/7 Accessories
Coil former Material: GFR thermosetting plastic; UL 94 V-0, insulation class to IEC 60085: B66418-B: F max. operating temperature 155 C; color code green B66418-W: H max. operating temperature 180 C; color code black Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 C, 2 s Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350 C, 3,5 s Winding: see "Processing Notes", page 157 Squared pins Yoke Material: Coil former Sections 1 AN mm2 28,1 lN mm 40,2 AR value 49,2 Pins 8 B66418-B1008-D1 B66418-W1008-D1 B66418-B2000 Stainless spring steel (0,3 mm) Ordering code
B66418
Yoke (ordering code per piece, 2 are required)
Coil former
200,2
Yoke
10,6 _ 0,15
View A AnsichtA 5,1
Mounting holes Montagelochung
4 8 5
1
2
3
20,3 max.
17,5
20,6
o1,3+0,1
18,7 min.
8
7
6
5
1 5 3 x 5 = 15
4
6,3 max.
Duroplast Markierung fur 1 Marking of pin Stift 1 14,8 _ 0,2 9,2+0,1
14,8 _ 0,2
13,2 min.
A
10,4 max. 1,7
9,5 _ 0,2
3,9
5,3
3,50,2
0,45 CuSn6, verzinnt CuSn6, tinned
FEK0210-2
1,6 _ 0,1
FEK0274-8
511 08/01
1,2
1,2
Herausgegeben von EPCOS AG Marketing Kommunikation, Postfach 80 17 09, 81617 Munchen, DEUTSCHLAND EPCOS AG 2000. Alle Rechte vorbehalten. Vervielfaltigung, Veroffentlichung, Verbreitung und Verwertung dieser Broschure und ihres Inhalts ohne ausdruckliche Genehmigung der EPCOS AG nicht gestattet. Mit den Angaben in dieser Broschure werden die Bauelemente spezifiziert, keine Eigenschaften zugesichert. Bestellungen unterliegen den vom ZVEI empfohlenen Allgemeinen Lieferbedingungen fur Erzeugnisse und Leistungen der Elektroindustrie, soweit nichts anderes vereinbart wird. Diese Broschure ersetzt die vorige Ausgabe. Fragen uber Technik, Preise und Liefermoglichkeiten richten Sie bitte an den Ihnen nachstgelegenen Vertrieb der EPCOS AG oder an unsere Vertriebsgesellschaften im Ausland. Bauelemente konnen aufgrund technischer Erfordernisse Gefahrstoffe enthalten. Auskunfte daruber bitten wir unter Angabe des betreffenden Typs ebenfalls uber die zustandige Vertriebsgesellschaft einzuholen.
Published by EPCOS AG Marketing Communications, P.O. Box 80 17 09, 81617 Munich, GERMANY EPCOS AG 2000. All Rights Reserved. Reproduction, publication and dissemination of this brochure and the information contained therein without EPCOS' prior express consent is prohibited. The information contained in this brochure describes the type of component and shall not be considered as guaranteed characteristics. Purchase orders are subject to the General Conditions for the Supply of Products and Services of the Electrical and Electronics Industry recommended by the ZVEI (German Electrical and Electronic Manufacturers' Association), unless otherwise agreed. This brochure replaces the previous edition. For questions on technology, prices and delivery please contact the Sales Offices of EPCOS AG or the international Representatives. Due to technical requirements components may contain dangerous substances. For information on the type in question please also contact one of our Sales Offices.
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