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2004 Sep 01
2
Ferroxcube
EC cores and accessories
EC70
CORE SETS
Effective core parameters
SYMBOL
PARAMETER
VALUE
UNIT
Σ(I/A)
core factor (C1)
0.514
mm−1
Ve
effective volume
40100
mm3
Ie
effective length
144
mm
Ae
effective area
279
mm2
Amin
minimum area
211
mm2
m
mass of core half
≈ 127
g
handbook, halfpage
MGC407
34.5
0.15
16.4 0.4
44.5 1.2
71.7 max
16.4
0.4
22.75
0.45
Fig.1 EC70 core half.
Dimensions in mm.
Core halves
AL measured in combination with an non-gapped core half, unless stated otherwise.
Note
1.
Measured in combination with an equal gapped core half (symmetrical air gap).
Properties of core sets under power conditions
GRADE
AL
(nH)
µ
e
AIR GAP
(
µm)
TYPE NUMBER
3C81
250
± 3%(1)
≈ 102
≈ 1830
EC70-3C81-E250
315
± 3%(1)
≈ 130
≈ 1370
EC70-3C81-E315
400
± 3%(1)
≈ 165
≈ 1020
EC70-3C81-E400
630
± 5%
≈ 256
≈ 580
EC70-3C81-A630
1000
± 10%
≈ 406
≈ 320
EC70-3C81-A1000
≥ 4000
≥ 1620
≈ 0
EC70-3C81
3C90
250
± 3%(1)
≈ 102
≈ 1830
EC70-3C90-E250
315
± 3%(1)
≈ 130
≈ 1370
EC70-3C90-E315
400
± 3%(1)
≈ 165
≈ 1020
EC70-3C90-E400
630
± 5%
≈ 256
≈ 580
EC70-3C90-A630
1000
± 10%
≈ 406
≈ 320
EC70-3C90-A1000
3900
± 25%
≈ 1580
≈ 0
EC70-3C90
GRADE
B (mT) at
CORE LOSS (W) at
H= 250 A/m;
f = 25 kHz;
T = 100
°C
f = 25 kHz;
= 200 mT;
T = 100
°C
f= 100 kHz;
= 100 mT;
T=100
°C
3C81
≥330
≤ 8.2
−
3C90
≥330
≤ 4.9
≤ 5.1
B
ˆ
B
ˆ
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