Datasheet

510 08/01
■ 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 = 1,52 mm
–1
l
e
= 47 mm
A
e
= 31 mm
2
A
min
= 31 mm
2
V
e
= 1 460 mm
3
Approx. weight 7,2 g/set
Ungapped
Gapped
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)
Validity range: K1, K2: 0,10 mm < s < 1,40 mm
K3, K4: 50 nH < A
L
< 410 nH
Material A
L
value
nH
µ
e
A
L1min
nH
P
V
W/set
Ordering code
N49 910 + 30/– 20 % 1100 750 < 0,29
(50 mT, 500 kHz, 100 °C)
B66417-G-X149
N87 1200 + 30/– 20 % 1440 660 < 1,05
(200 mT, 100 kHz, 100 °C)
B66417-G-X187
Material A
L
value
nH
µ
e
g
approx. mm
Ordering code
N87 100
± 10 % 120 0,49 B66417-U100-K187
160
± 10 % 193 0,25 B66417-U160-K187
Material Relationship between
air gap – A
L
value
Calculation of saturation current
K1 (25 °C) K2 (25 °C) K3 (25 °C) K4 (25 °C) K3 (100 °C) K4 (100 °C)
N87 61,1 – 0,699 85,4 – 0,796 75,7 – 0,873
B66417Core
EFD 20/10/7