EFD 25/13/9
Core
B66421
q
E core with flattened, lower center leg
for especially flat transformer design
q
For DC/DC converters
q
EFD cores are supplied as single units
Magnetic characteristics
(per set)
危
l/A
l
e
A
e
A
min
V
e
= 0,98 mm
鈥?
= 57 mm
= 58 mm
2
= 57 mm
2
= 3 310 mm
3
Approx. weight
16,6 g/set
Ungapped
Material
A
L
value
碌
e
A
L1min
P
V
Ordering code
N67
N87
nH
nH
2000 + 30/鈥?20 % 1560 1280
2000 + 30/鈥?20 % 1560 1280
W/set
2,10
B66421-G-X167
(200 mT, 100 kHz, 100 藲C)
1,80
B66421-G-X187
(200 mT, 100 kHz, 100 藲C)
Gapped
Material
A
L
value
nH
碌
e
N67,
N87
160
鹵
10 %
250
鹵
10 %
315
鹵
10 %
125
195
246
g
approx.
mm
0,55
0,30
0,22
Ordering code
** = 67 (N67)
= 87 (N87)
B66421-U160-K1**
B66421-U250-K1**
B66421-U315-K1**
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
(see page
423
for formulas)
Material
Relationship between
air gap 鈥?/div>
A
L
value
K1
(25 藲C)
K2
(25 藲C)
103
鈥?0,734
103
鈥?0,734
Calculation of saturation current
N67
N87
Validity range:
K3
(25 藲C)
150
154
K4
(25 藲C)
鈥?0,820
鈥?0,796
K3
(100 藲C)
K4
(100 藲C)
142
鈥?0,881
138
鈥?0,873
K1, K2:
0,10 mm <
s
< 1,40 mm
K3, K4:
50 nH <
A
L
< 410 nH
Siemens Matsushita Components
554
1
2
