EFD 15/8/5
B66413Core
■ E core with flattened, lower center leg
for especially flat transformer design
■ For DC/DC converters
■ EFD cores are supplied as single units
Magnetic characteristics (per set)
Σl/A = 2,27 mm
–1
le= 34 mm
= 15 mm
A
e
A
= 12,2 mm
min
Ve= 510 mm
2
2
3
Approx. weight 2,8 g/set
Ungapped
Material A
nH
value
L
µ
e
A
nH
L1min
P
V
W/set
N49 600 + 30/– 20 % 1080 330 < 0,11
(50 mT, 500 kHz, 100 °C)
N87 780 + 30/– 20 % 1400 560 < 0,28
(200 mT, 100 kHz, 100 °C)
Gapped
Material A
value
L
µ
e
nH
N87 100
± 10 % 180 0,17 B66413-U100-K187
± 15 % 288 0,08 B66413-U160-L187
160
g
approx. mm
g
4,65±0,15
Ordering code
B66413-G-X149
B66413-G-X187
Ordering code
15±0,4
5,3±0,15
11±0,35
5,5±0,2
0,2±0,1
FEK0417-2
7,5±0,15
2,4±0,1
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
Calculation of saturation current
K1 (25 °C) K2 (25 °C) K3 (25 °C) K4 (25 °C) K3 (100 °C) K4 (100 °C)
N87 29,7 – 0,676 44,2 – 0,796 33,2 – 0,873
Validity range: K1, K2: 0,10 mm < s < 1,00 mm
K3, K4: 30 nH < A
< 280 nH
L
507 08/01
EFD 15/8/5
B66414Accessories
Coil former
Material: GFR thermosetting plastic; UL 94 V-0, insulation class to IEC 60085:
B66414-B: F max.operating temperature 155 °C; color code green
B66414-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: Stainless spring steel (0,25 mm)
Coil former Ordering code
Sections A
mm
N
2
l
N
mm
A
µΩ
value
R
Pins
1 15,5 35,9 79,7 8 B66414-B1008-D1
B66414-W1008-D1
Yoke (ordering code per piece, 2 are required) B66414-B2000
Coil former Yoke
1
8
Duroplast
Marking of pin 1
10,55
5,55+0,15
1,7
8,3 max.3,5±0,2
15±0,2
_
0,1
6,95
2
7
6
_
0,15
0,45
CuSn6, tinned
43
5
16,5±0,2
2,55
0,2
_
7,5
_
13,75
0,151,6
Mounting holes
8
1
3,75
11,25
_
0,2
10,4
8,85 min.
508 08/01
5
ø1+0,1
4
4
FEK0418-A
15,6
4,4
13,6 min. 1
1
4,8 max.
FEK0271-J
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