B66417 Datasheet, PDF (1/3 Pages) EPCOS – EFD 20/10/7 Core

EFD 20/10/7
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)
Σl/A = 1,52 mm^–1
l_e = 47 mm
A_e = 31 mm²
A_min = 31 mm²
V_e = 1 460 mm³
Approx. weight 7,2 g/set
B66417
Ungapped
Material
N49
N87
A_L value
nH
µ_e A_L1min P_V
nH W/set
Ordering code
910 + 30/– 20 % 1100 750 < 0,29
B66417-G-X149
(50 mT, 500 kHz, 100 °C)
1200 + 30/– 20 % 1440 660 < 1,05
B66417-G-X187
(200 mT, 100 kHz, 100 °C)
Gapped
Material A_L value
µ_e
nH
N87
100 ± 10 %
120
160 ± 10 %
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 “E cores: general information”, page 382)
Material
N87
Relationship between
air gap – A_L value
K1 (25 °C) K2 (25 °C)
61,1
– 0,699
Calculation of saturation current
K3 (25 °C) K4 (25 °C) K3 (100 °C) K4 (100 °C)
85,4
– 0,796
75,7
– 0,873
Validity range:
K1, K2: 0,10 mm < s < 1,40 mm
K3, K4: 50 nH < A_L < 410 nH
510 08/01