ETD 54/28/19
Core
■
To IEC 62317-6
■
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
Approx. weight
180 g/set
Ungapped
Material A
L
value
nH
N27
N87
N97
μ
e
B
S
*
mT
320
320
320
P
V
W/set
Ordering code
4200 +30/–20% 1510
4450 +30/–20% 1600
4600 +30/–20% 1650
< 6.66 (200 mT, 25 kHz, 100 °C) B66395G0000X127
< 3.20 (100 mT, 100 kHz, 100 °C) B66395G0000X187
< 2.60 (100 mT, 100 kHz, 100 °C) B66395G0000X197
* H = 250 A/m; f = 10 kHz; T = 100 °C
Gapped
(A
L
values/air gaps examples)
Material
g
mm
N27,
N87
0.20
±0.02
0.50
±0.05
1.00
±0.05
1.50
±0.05
2.00
±0.05
A
L
value
approx.
nH
1377
670
393
287
229
μ
e
Ordering code
** = 27 (N27)
**
= 87 (N87)
B66395G0200X1**
B66395G0500X1**
B66395G1000X1**
B66395G1500X1**
B66395G2000X1**
496
240
141
103
82
The A
L
value in the table applies to a core set comprising one ungapped core (dimension g = 0 mm)
and one gapped core (dimension g > 0 mm).
Other A
L
values/air gaps and materials available on request ─ see Processing remarks on page 5.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
2
5/17
ETD 54/28/19
Accessories
Coil former
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 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
Stainless spring steel (0.4 mm)
Ordering code
Material:
B66396
Yoke (ordering code per piece, 2 are required)
Coil former
Yoke
Please read
Cautions and warnings
and
Important notes
at the end of this document.
4
5/17
Ferrites and accessories
Cautions and warnings
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 tempera-
ture 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, 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, chapter
“General - Definitions, 8.1”.
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.
Ferrite Accessories
EPCOS ferrite accessories have been designed and evaluated only in combination with EPCOS
ferrite cores. EPCOS explicitly points out that EPCOS ferrite accessories or EPCOS ferrite cores
may not be compatible with those of other manufacturers. Any such combination requires prior te-
sting by the customer and will be at the customer‘s own risk.
EPCOS assumes no warranty or reliability for the combination of EPCOS ferrite accessories with
cores and other accessories from any other manufacturer.
Processing remarks
The start of the winding process should be soft. Else the flanges may be destroyed.
– Too strong winding forces may blast the flanges or squeeze the tube that the cores can not be
mounted any more.
– Too long soldering time at high temperature (>300 °C) may effect coplanarity or pin arrange-
ment.
– Not following the processing notes for soldering of the J-leg terminals may cause solderability
problems at the transformer because of pollution with Sn oxyde of the tin bath or burned insula-
tion of the wire. For detailed information see chapter
“Processing notes”,
section 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.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
5
5/17
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