B66421 Datasheet, PDF (1/3 Pages) EPCOS – EFD 25/13/9 Core

EFD 25/13/9
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 = 0,98 mm^–1
l_e = 57 mm
A_e = 58 mm²
A_min = 57 mm²
V_e = 3 310 mm³
Approx. weight 16,6 g/set
B66421
Ungapped
Material
N87
A_L value
nH
µ_e A_L1min P_V
nH W/set
Ordering code
2000 + 30/– 20 % 1560 1280 < 1,80
B66421-G-X187
(200 mT, 100 kHz, 100 °C)
Gapped
Material A_L value
µ_e
nH
N87
160 ± 10 %
125
250 ± 10 %
195
315 ± 10 %
246
g
approx. mm
0,55
0,30
0,22
Ordering code
B66421-U160-K187
B66421-U250-K187
B66421-U315-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)
103
– 0,734
Calculation of saturation current
K3 (25 °C) K4 (25 °C) K3 (100 °C) K4 (100 °C)
154
– 0,796
138
– 0,873
Validity range:
K1, K2: 0,10 mm < s < 1,40 mm
K3, K4: 50 nH < A_L < 410 nH
512 08/01