EFD 20/10/7
■ 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
le= 47 mm
= 31 mm
A
e
A
= 31 mm
min
Ve= 1 460 mm
2
2
3
Approx. weight 7,2 g/set
Ungapped
B66417Core
Material A
nH
value
L
µ
e
A
nH
L1min
P
V
W/set
N49 910 + 30/– 20 % 1100 750 < 0,29
Ordering code
B66417-G-X149
(50 mT, 500 kHz, 100 °C)
N87 1200 + 30/– 20 % 1440 660 < 1,05
B66417-G-X187
(200 mT, 100 kHz, 100 °C)
Gapped
Material A
value
L
nH
N87 100
The A
± 10 % 120 0,49 B66417-U100-K187
± 10 % 193 0,25 B66417-U160-K187
160
value in the table applies to a core set comprising one ungapped core (dimension g = 0) and
L
µ
e
g
Ordering code
approx. mm
one gapped core (dimension g > 0).
Calculation factors (for formulas, see “E cores: general information”, page 382)
Material Relationship between
air gap – A
value
L
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
Validity range: K1, K2: 0,10 mm < s < 1,40 mm
K3, K4: 50 nH < A
< 410 nH
L
510 08/01
EFD 20/10/7
B66418Accessories
Coil former
Material: GFR thermosetting plastic; UL 94 V-0, insulation class to IEC 60085:
B66418-B: F max. operating temperature 155 °C; color code green
B66418-W: H max. operating temperature 180 °C; color code black
Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 °C, 2 s
Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350 °C, 3,5 s
Winding: see “Processing Notes”, page 157
Squared pins
Yoke
Material: Stainless spring steel (0,3 mm)
Coil former Ordering code
Sections A
mm
N
2
l
N
mm
A
µΩ
value
R
Pins
1 28,1 40,2 49,2 8 B66418-B1008-D1
B66418-W1008-D1
Yoke (ordering code per piece, 2 are required) B66418-B2000
Coil former Yoke
View A
20±0,2
_
0,1510,6
1234
Mounting holes
Montagelochung
85
Ansicht A
5,1
1,2
8765
Markierung für Stift 1
Marking of pin 1
1,7
10,4 max.
3,5±0,2
Duroplast
_
0,214,8
9,2+0,1
0,45
CuSn6, verzinnt
CuSn6, tinned
20,3 max.
_
3,9
9,5 0,2
ø1,3+0,1
17,5
14
5
3 x 5 = 15
_
0,214,8
13,2 min.
0,11,6
_
5,3
FEK0210-2
511 08/01
20,6
6,3 max.
18,7 min.
1,2
A
FEK0274-8
Loading...