Cores with distributed gap for output choke

MSC series

Toroidal cores of the MSC series with a distributed gap are made of a thin (18 ± 2 μm) amorphous iron-based AMAG202 ribbon. The distributed gap, obtained due to a special mode of thermomagnetic treatment, allows to obtain magnetic cores of minimum dimensions, helps to reduce losses, high manufacturability, and low cost.

With a high saturation induction (1.4 T) and a typical magnetic permeability of 290, magnetic cores have higher DC bias properties and require fewer winding turns compared to other competing materials such as ferrites, iron-based PMDs, sendast and permalloy. ...

MSC series small choke cores are a good solution for the implementation of miniature DC / DC converters for mobile devices, adapters, chargers, miniature car devices, hybrid integrated circuits, differential filter chokes, etc.

 

 

 

Dimensions and basic characteristics

MSC series

Core name

Dimensions *

in container
(without container)
(D-d-H)
(mm)

Aeff 2)

(mm2)

Leff 3)

(mm)

Veff 4)

(mm3)

m 5)

(g)

AL 6)

(μH / turn2)

± 20%

DCB 7)

(A × turn)

 

Low-profile cores in an aluminum container (μ = 280) *
MSCL0510

​​

4.7 - 1.9 - 1.4

(4.3 - 2.3 - 1.0)

 0.76 10.4 7.88 0.06 0.026 29.0
MSCL0620

6.4 - 2.6 - 2.4

(6.0 - 3.0 - 2.0)

 2.28 14.1 32.2 0.24 0.058 39.6
MSCL0715

6.8 - 2.6 - 1.9

(6.4 - 3.0 - 1.5)

 1.94 14.8 28.6 0.21 0.047 41.3
MSCL0725

6.9 - 2.5 - 3.0

(6.4 - 3.0 - 2.5)

 3.23 14.8 47.7 0.35 0.079 41.3
MSCL0815

8.4 - 3.6 - 1.9

(8.0 - 4.0 - 1.5)

 2.28 18.8 42.96 0.31 0.043 52.8
MSCL0830

8.5 - 3.5 - 3.5

(8.0 - 4.0 - 3.0)

 4.6 18.8 85.9 0.63 0.087 52.6
MSCL1020

10.7 - 4.3 - 2.5

(10.0 - 5.0 - 2.0)

 3.8 23.6 89.5 0.65 0.058 65.9
MSCL1030

10.8 - 4.3 - 3.6

(10.0 - 5.0 - 3.0)

 5.7 23.6 134.2 0.98 0.087 65.9

 

In an aluminum container (μ = 290) *
MSCL-12S-N

12.7 - 7.3 - 5.7

(12.0 - 8.0 - 5.0)

 7.60 31.4 238.6 1.74 0.088 87.9
MSCL-15A-N

15.8 - 9.2 - 5.8

(15.0 - 10.0 - 5.0)

 9.50 39.3 372.9 2.72 0.088 109.9
MSCL-15S-N

15.8 - 9.2 - 6.8

(15.0 - 10.0 - 6.0)

 11.4 39.3 447.4 3.27 0.105 109.9
MSCL-18A-N

18.8 - 11.1 - 5.8

(18.0 - 12.0 - 5.0)

 11.4 47.1 536.9 3.92 0.088 131.9
MSCL-18S-N

18.8 - 11.1 - 6.8

(18.0 - 12.0 - 6.0)

 13.7 47.1 644.3 4.70 0.105 131.9
MSCL-20A-N

20.8 - 11.1 - 5.8

(20.0 - 12.0 - 5.0)

 15.2 50.2 763.6 5.58 0.110 140.7
MSCL-20S-N

20.8 - 11.1 - 6.8

(20.0 - 12.0 - 6.0)

 18.2 50.2 916.4 6.69 0.132 140.7

 

In a plastic container (μ = 290) *
MSCB-12S-N

14.2 - 6.4 - 6.5

(12.0 - 8.0 - 4.5)

 6.8 31.4 214.8 1.57 0.079 87.9
MSCB-15A-N

16.9 - 10.0 - 6.5

(15.0 - 12.0 - 4.5)

 5.13 42.4 217.5 1.59 0.044 118.7
MSCB-15S-N

16.9 - 8.0 - 6.5

(15.0 - 10.0 - 4.5)

 8.55 39.3 335.6 2.45 0.079 109.9
MSCB-18S-N

20.0 - 10.2 - 6.6

(18.0 - 12.0 - 4.5)

 10.26 47.1 483.2 3.53 0.079 131.9
MSCB-20A-N

22.7 - 10.2 - 10.3

(20.0 - 12.5 - 8.0)

 22.80 51.0 1163.4 8.49 0.163 142.9

 

Paint coated (μ = 290) *
MSCP-12S-N

13.0 - 7.0 - 6.0

(12.0 - 8.0 - 5.0)

 7.60 31.4 238.6 1.74 0.088 87.9
MSCP-15A-N

16.0 - 9.0 - 6.0

(15.0 - 10.0 - 5.0)

 9.50 39.3 372.9 2.72 0.088 109.9
MSCP-15S-N

16.0 - 9.0 - 7.0

(15.0 - 10.0 - 6.0)

 11.4 39.3 447.4 3.27 0.105 109.9
MSCP-18A-N

19.0 - 11.0 - 6.0

(18.0 - 12.0 - 5.0)

 11.4 47.1 536.9 3.92 0.088 131.9
MSCP-18S-N

19.0 - 11.0 - 7.0

(18.0 - 12.0 - 6.0)

 13.7 47.1 644.3 4.70 0.105 131.9
MSCP-20A-N

21.0 - 11.0 - 6.0

(20.0 - 12.0 - 5.0)

 15.2 50.2 763.6 5.58 0.110 140.7
MSCP-20S-N

21.0 - 11.0 - 7.0

(20.0 - 12.0 - 6.0)

 18.2 50.2 916.4 6.69 0.132 140.7

Note:

  • 1) Dimensions of the core in the container. Ext. dia. - Int. dia. - Height. Accuracy ± 0.2 mm.
  • 2) Nominal effective cross-sectional area.
  • 3) Nominal values of the magnetic center line length.
  • 4) Nominal effective volume.
  • 5) Nominal weight without container. Tolerance ± 10%.
  • 6) Inductance factor. Rated at 100 kHz, lac × N = 20 mA and +25 °C.
  • 7) Maximum magnetomotive force (ampere-turns).
  • * Temperature range from –60 °C to +125 °C.

IMPORTANT: When using a wire with a diameter of more than 0.45 mm, in order to eliminate pressure on the magnetic material, we recommend using magnetic cores in a plastic container (MSCB).

 

​ Program for calculating output chokes

Application

  • Output chokes for switching power supplies
  • Flyback transformers
  • Input and output differential chokes
  • Power inductors
  • Chokes for AC / DC and DC / DC converters, adapters, chargers, mobile devices, etc.
  • Car electronics

 

Advantages

  • High saturation induction
  • High operating temperature
  • Significant reduction in component size
  • Low losses
  • Ability to work with higher bias current
  • Fewer turns due to higher permeability

 

Additional parameters and characteristics

Inductance versus displacement
Specific losses

The main characteristics of the material used

  • Material AMAG 202
  • Ribbon thickness: 18 ± 2 microns
  • Saturation induction, Вs (25 °C): 1,4 T
  • Curie temperature, Tc: 420 °C
  • Crystallization temperature: 530 °C
  • Operating temperature range: –60 °C to +125 °C
  • Density: 7.3 g/cm3
  • Maximum magnetic bias field: 35 Oe (2800 A/m) 

Design

The MSC series is available in three designs:

  • 1. The coiled ribbon core is impregnated and placed in a protective aluminum foil container (MSCL). The container has an insulating coating (chemical phosphate oxidation), rounded edges and is designed for direct wrapping. Be careful when winding with thick wire. A thin-walled container is small, but does not guarantee protection against mechanical pressure on the tape, which leads to a decrease in magnetic characteristics.
  • 2. Flame retardant plastic container (MSCB). A plastic container with a rigid structure and rounded edges provides reliable mechanical protection of the magnetic circuit from external influences while maintaining its properties, as well as the ability to apply winding with a large diameter wire.
  • 3. Coated with epoxy powder paint (MSCP).

Temperature range from –60 °C to +125 °C.

Recording example 

MSСL(B,P)-12S-N, где:

  • MS – MSTATOR;
  • C – purpose (choke);
  • L – aluminum container;
  • B – plastic container;
  • P – paint coating;
  • 12  – outer diameter, mm;
  • S – sectional designation;
  • N – heat treatment without magnetic field.