Ferrites and accessories
ETD 54/28/19
Core and accessories
Series/Type:
B66395, B66396
September 2006, December 2008
7f
fÁRspp
Date:
©
EPCOS AG 2006. Reproduction, publication and dissemination of this data sheet, enclosures
hereto and the information contained therein without EPCOS’ prior express consent is prohibited.
ETD 54/28/19
Core
■
To IEC 61185
■
For SMPS transformers with optimum
B66395
weight/performance ratio at small volume
■
Delivery mode: single units
Magnetic characteristics
(per set)
Σl/A
l
e
A
e
A
min
V
e
= 0.45 mm
–1
= 127 mm
= 280 mm
2
= 280 mm
2
= 35600 mm
3
27,8
_
0,4
19,8+0,8
19,3
_
0,8
19,3
_
0,8
Approx. weight
180 g/set
40,1+2,2
54,5±1,3
FEK0065-W
Ungapped
Material
N27
N87
N97
A
L
value
nH
4200 +30/–20%
4450 +30/–20%
4600 +30/–20%
μ
e
1510
1600
1650
P
V
W/set
< 6.66 (200 mT, 25 kHz, 100 °C)
Ordering code
B66395G0000X127
< 21.00 (200 mT, 100 kHz, 100 °C) B66395G0000X187
< 18.00 (200 mT, 100 kHz, 100 °C) B66395G0000X197
Gapped
Material
g
mm
N27,
N87
0.20
±0.02
1.00
±0.05
1.50
±0.05
2.00
±0.05
A
L
value
approx.
nH
1377
393
287
229
μ
e
Ordering code
** = 27 (N27)
**
= 87 (N87)
B66395G0200X1**
B66395G1000X1**
B66395G1500X1**
B66395G2000X1**
496
141
103
82
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).
Please read
Cautions and warnings
and
Important notes
at the end of this document.
2
09/06
ETD 54/28/19
Core
Calculation factors
(for formulas, see
“E cores: general information”)
Material
Relationship between
air gap – A
L
value
K1 (25 °C)
N27
N87
Validity range:
393
393
K2 (25 °C)
–0.779
–0.779
Calculation of saturation current
K3 (25 °C)
658
630
K4 (25 °C)
–0.847
–0.796
K3 (100 °C) K4 (100 °C)
615
603
–0.865
–0.873
B66395
K1, K2: 0.10 mm < s < 3.50 mm
K3, K4: 140 nH < A
L
< 1390 nH
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
09/06
ETD 54/28/19
Accessories
Coil former
Material:
GFR polyterephthalate (UL 94 V-0, insulation class to IEC 60085:
H max. operating temperature 180 °C), color code black
Rynite FR 530
®
[
E41938 (M)
]
, E I DUPONT DE NEMOURS & CO INC
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 Data Book 2007, chapter “Processing notes, 2.1”
Yoke
Material:
Coil former
Sections
1
A
N
mm
2
315.6
l
N
mm
96
A
R
value
μΩ
10.5
Pins
22
B66396W1022T001
B66396A2000X000
Yoke
Pin 1
marking
61.4 max.
39.4 max.
36.8 min.
B66396
Stainless spring steel (0.4 mm)
Ordering code
Yoke (ordering code per piece, 2 are required)
Coil former
61.6 max.
39.15 min.
22 max.
19.8 min.
4.5±0.5
46 max.
ø1
ø1.6+0.15
Hole arrangement
View in mounting direction
45.72
11 x 5.08 = 55.88
ø3.4+0.15
(for fixing with sheet-steel screw
DIN 7971-St 2.9 x 6.5-C)
FEK0416-T-E
Please read
Cautions and warnings
and
Important notes
at the end of this document.
4
12/08
Ferrites and accessories
Cautions and warnings
Mechanical stress and mounting
Ferrite cores have to meet mechanical requirements during assembling and for a growing number
of applications. Since ferrites are ceramic materials one has to be aware of the special behavior
under mechanical load.
As valid for any ceramic material, ferrite cores are brittle and sensitive to any shock, fast changing
or tensile load. Especially high cooling rates under ultrasonic cleaning and high static or cyclic loads
can cause cracks or failure of the ferrite cores.
For detailed information see Data Book 2007, chapter “General – Definitions, 8.1”.
Effects of core combination on A
L
value
Stresses in the core affect not only the mechanical but also the magnetic properties. It is apparent
that the initial permeability is dependent on the stress state of the core. The higher the stresses are
in the core, the lower is the value for the initial permeability. Thus the embedding medium should
have the greatest possible elasticity.
For detailed information see Data Book 2007, chapter “General – Definitions, 8.2”.
Heating up
Ferrites can run hot during operation at higher flux densities and higher frequencies.
NiZn-materials
The magnetic properties of NiZn-materials can change irreversible in high magnetic fields.
Processing notes
– The start of the winding process should be soft. Else the flanges may be destroid.
– To strong winding forces may blast the flanges or squeeze the tube that the cores can no more
be mount.
– To long soldering time at high temperature (>300 °C) may effect coplanarity or pin arrangement.
– Not following the processing notes for soldering of the J-leg terminals may cause solderability
problems at the transformer because of pollution with Sn oxyd of the tin bath or burned insulation
of the wire. For detailed information see Data Book 2007, chapter “Processing notes, 2.2”.
– The dimensions of the hole arrangement have fixed values and should be understood as a
recommendation for drilling the printed circuit board. For dimensioning the pins, the group of
holes can only be seen under certain conditions, as they fit into the given hole arrangement. To
avoid problems when mounting the transformer, the manufacturing tolerances for positioning the
customers’ drilling process must be considered by increasing the hole diameter.
5
09/06
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