B66421

Manufacturer Part NumberB66421
DescriptionEFD 25/13/9 Core
ManufacturerEpcos
B66421 datasheet
 
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EFD 25/13/9
Core
I
E core with flattened, lower center leg
for especially flat transformer design
I
For DC/DC converters
I
EFD cores are supplied as single units
Magnetic characteristics (per set)
–1
l/A = 0,98 mm
l
= 57 mm
e
2
A
= 58 mm
e
2
A
= 57 mm
min
3
V
= 3 310 mm
e
Approx. weight 16,6 g/set
Ungapped
Material
A
value
L
nH
N87
2000 + 30/– 20 % 1560 1280
Gapped
Material
A
value
L
nH
N87
160
10 %
125
250
10 %
195
315
10 %
246
The A
value in the table applies to a core set comprising one ungapped core (dimension g = 0) and
L
one gapped core (dimension g > 0).
Calculation factors (for formulas, see “E cores: general information”, page 382)
Material
Relationship between
air gap – A
value
L
K1 (25 °C)
K2 (25 °C)
N87
103
– 0,734
Validity range:
K1, K2: 0,10 mm < s < 1,40 mm
K3, K4: 50 nH < A
A
P
e
L1min
V
nH
W/set
< 1,80
(200 mT, 100 kHz, 100 °C)
g
e
approx. mm
0,55
0,30
0,22
Calculation of saturation current
K3 (25 °C)
K4 (25 °C)
154
– 0,796
< 410 nH
L
512
08/01
B66421
Ordering code
B66421-G-X187
Ordering code
B66421-U160-K187
B66421-U250-K187
B66421-U315-K187
K3 (100 °C) K4 (100 °C)
138
– 0,873

B66421 Summary of contents

  • Page 1

    ... P e L1min V nH W/set < 1,80 (200 mT, 100 kHz, 100 ° approx. mm 0,55 0,30 0,22 Calculation of saturation current K3 (25 °C) K4 (25 °C) 154 – 0,796 < 410 nH L 512 08/01 B66421 Ordering code B66421-G-X187 Ordering code B66421-U160-K187 B66421-U250-K187 B66421-U315-K187 K3 (100 °C) K4 (100 °C) 138 – 0,873 ...

  • Page 2

    EFD 25/13/9 Accessories Coil former Material: GFR thermosetting plastic V-0, insulation class to IEC 60085: B66422-B: F max.operating temperature 155 °C; color code green B66422-W: H max.operating temperature 180 °C; color code black Solderability: to IEC 60068-2-20, test ...

  • Page 3

    ... 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 ...