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)
危
l/A
l
e
A
e
A
min
V
e
= 1,52 mm
鈥?
= 47 mm
= 31 mm
2
= 31 mm
2
= 1 460 mm
3
Approx. weight
7,2 g/set
Ungapped
Material
N49
N87
A
L
value
nH
碌
e
A
L1min
P
V
nH
W/set
Ordering code
910 + 30/鈥?20 % 1100 750
1200 + 30/鈥?20 % 1440 660
B66417-G-X149
< 0,29
(50 mT, 500 kHz, 100 擄C)
< 1,05
B66417-G-X187
(200 mT, 100 kHz, 100 擄C)
Gapped
Material
N87
A
L
value
nH
100
鹵
10 %
160
鹵
10 %
碌
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
鈥淓 cores: general information鈥?
page 382)
Material
Relationship between
air gap 鈥?/div>
A
L
value
K1
(25 擄C)
N87
Validity range:
61,1
K2
(25 擄C)
鈥?0,699
Calculation of saturation current
K3
(25 擄C)
85,4
K4
(25 擄C)
鈥?0,796
K3
(100 擄C)
K4
(100 擄C)
75,7
鈥?0,873
K1, K2:
0,10 mm <
s
< 1,40 mm
K3, K4:
50 nH <
A
L
< 410 nH
510
08/01
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2
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