1997 Nov 21

2

Philips Components

Product specification

EFD cores and accessories

EFD25

CORES

Effective core parameters

SYMBOL

PARAMETER

VALUE

UNIT

Σ(I/A)

core factor (C1)

1.00

effective volume

3300

effective length

57.0

mm

effective area

58.0

minimum area

55

m

mass of core half

≈8g

Fig.1 EFD25 core half.

Dimensions in mm.

handbook, halfpage

MGC342

11.4

0.2

18.7 0.6

25 0.65

9.3

0.25

12.5

0.15

5.2

0.15

0.6

9.1

0.2

Core halves

Gapped cores are available on request. Clamping force 40

±20 N.

Properties of core sets under power conditions

GRADE

(nH)

µ

e

AIR GAP

(

µm)

TYPE NUMBER

3C30

1800

±25%

≈1450

≈0

EFD25-3C30

3C85

2200

±25%

≈1780

≈0

EFD25-3C85

3C90

2200

±25%

≈1780

≈0

EFD25-3C90

3F3

2000

±25%

≈1600

≈0

EFD25-3F3

3F4

1000

±25%

≈800

≈0

EFD25-3F4

GRADE

B (mT) at

CORE LOSS (W) at

H = 250 A/m;

f = 25 kHz;

T = 100

°C

f=25kHz;

= 200 mT;

T = 100

°C

f = 100 kHz;

= 100 mT;

T = 100

°C

f = 400 kHz;

=50mT;

T = 100

°C

f = 1 MHz;

=30mT;

T = 100

°C

f = 3 MHz;

=10mT;

T = 100

°C

3C30

≥360

≤0.35

≤0.38

−−

−

3C85

≥320

≤0.50

≤0.60

−−

−

3C90

≥330

≤0.35

≤0.38

−−

−

3F3

≥315

−≤0.38

≤0.66

−−

3F4

≥300

−−

−

≤0.70

≤1.10

B

ˆ

B

ˆ

B

ˆ

B

ˆ

B

ˆ