NANOCRYSTALLINE/AMORPHOUS/DUST CHOKE COILSRELIABILITY TEST CONDITIONS (Environmental Testing)
The reliability of products are tested under the following conditions. (Not including some cut cores)

TEST TITLECOMPLIANT STANDARD

Vibration(Sinusoidal)

JISC
60068-2-6

Amplitude: 1.5mm
Frequency Range: 10-55Hz (1 minute/sweep cycle)
Test Duration: Total 6 hours (2 hours each per X・Y・Z axis)

Free Fall

JISC
60068-2-32

Three consecutive drops from 1m height onto veneer plywood (width 10mm)

ColdJISC
60068-2-1

Temperature: -25℃
500 hours

Dry Heat

JISC
60068-2-2

Temperature: 120℃
500 hours

Damp Heat,
Steady State

JISC
60068-2-3

Temperature: 55℃
Relative Humidity: 95%
Test Duration: 500 hours

Change ofTemperature

CONDITIONS

Temperature-25℃
Room Temperature+120℃
Room Temperature

JISC 0025

Conditioning Times
30 minutes
Less than 1 minute30 minutes
Less than 1 minute

CUSTOM DESIGN CONDITIONS◆ Fig.1 Relationship between Coil Volume and Energy
Product (Amount of energy that can be handled)

Nippon Chemi-Con's amorphous choke coils are available in awide variety of standard products, but we also offer custommade products upon request. Here, we will introduce how ourchoke coils are designed, with reference to various data listed
in the catalog.

1000

Energy ProductLnI nVofsw

[μH]
[A]
[V]
[ kHz ]L I

EI60

LNC211205G

EI50
EI40

LNC150905G
LNC130805G

EI30

10.1

Ferrite

EI25
EI22[mH・A2]

With reference to the graph of "Coil Volume and Energy
Product“(Fig. 1), select a core with a similar energy product.
The required energy product is calculated as below.

110100Coil Volume [cm ]1000

3⑤ Confirming the Winding

2Ln・In /1000

Check if the winding specifications set in ③ and ④ can be applied to thecore. When winding is possible, the winding space factor is 30% or less.
It is important to confirm the winding based on actual performance.

③ Determining the Number of Turns

The specifications of the selected cores are listed at thebeginning of each series. Find the inductance coefficient (ALvalue) from the core specification table and determine thenumber of turns (N).

Winding Space Factor =Ln /AL④ Determining Diameter of Winding(Winding Diameter)²x # of Turns x 100[%](Inner Diameter of Core Exterior)²

If winding is not possible, reselect larger core size or
choose from another series.

⑥ Calculation of Core Loss

As a guide, the current density is around 6 [A / mm²] withrespect to the effective value (Irms) of the current flowing
through the choke coil.
Irms
2A
3A
5A
8A
10 A

LNC191305G

10n・ n 2② Selection of Core

N=LNC462725G
LNC462715G
LNC372310G
LNC251510G
LNC221310G

Amorphous

100① Required Specifications for Choke Coil
Rated InductanceRated Current
Voltage across coil
Conversion Frequency

Number of cycles: 25

Calculate the magnetic flux density (△Bp-p, [mT]) from thevoltage across coil (Vo), the conversion frequency (fsw), andthe maximum duty (D [%]). Please refer to the core referencetable for the cross-sectional area of the core (Ae [cm²]).

Diameter

0.6mmφ0.8mm
1.0mm
1.3mm
1.0mmx2P

Bp-p = Vo・D/fsw/Ae/N×100
Based on the magnetic flux density, find the core loss per unit
weight from the Core Loss Characteristics graph of eachseries. Multiply this by the core weight to calculate core loss.

Product specifications in this catalog are subject to change without notice.Request our product specifications before purchase and/or use. Please use our products based on the information contained in this catalog and product specifications.

112

CAT. No. E1008Y 2024

NANOCRYSTALLINE/AMORPHOUS/DUST CHOKE COILSCHOKE COIL CHARACTERISTICS◆Characteristics comparison of magnetic materials

Foil strip

Product name

Amorphous
Silicon steel plate

Powersystem

Alloy dust
PowderferriteNormalPowder

CommonFe-Si-B

1.56- 5,000415- 150

Co-Fe-Ni-Si-B

0.6- 18,000

180-Fe-Si

1.3

- 800

700

- 20

Fe-Ni
(High Flux)

1.5

26 to 160

420

- 300

Fe-Si-Al(Sendust)

1.1

26 to 125

570

- 150

Fe-Si(Mega flax)

1.6

26 to 90

500

- 50

Fe-Si-B(Amorphous dust)

1.56

60 to 200

415

- 300

Mn-Zn

0.4

- 2,400

250

- 500

Ni-Zn

0.3

10 to 500350

- 1,000

Fe dustFoil strip Nanocrystalline
PowderComposition

ferriteFrequency
Characteristics(Reference)
[kHz]

Fe

1.0

75

770

- 20

Fe-Si-Br-Nb-Cu

1.23

15,000 to
31,000570- 1,000

Mn-Zn

0.5

5,000 to16,000130- 1,000◆Magnetic material map
1,000,000

100,000

Permeability

Material
shapeApplication

Saturation
MagneticCurie
magnetic
permeability point
flux density
μ(100[kHz]) Tc [°C]
Bs [mT]

Nanocrystalline
material

Co-basedamorphous

10,000Fe-basedamorphous

ferrite1,000

silicon steel
100

Alloy-based dust
Fe-Ni, Fe-Si-Al, Fe-Si

100.5

1.0

2.0

1.5

Saturation magnetic flux density [T]◆D.C. bias of normal mode choke coil

◆D.C. bias of amorphous choke coil●Temperature dependence : Core temperature 25, 100℃

1201000

Fe-based amorphous60amorphous
25℃

40

Ferrite
25℃

100Dustamorphous
100℃

200Permeability

80

FerriteFerrite
100℃
050

100

15020010250

0D.C. bias (relative value against rated current) lb [%]

800

1600

2400

3200

4000

4800

5600

6400

7200 8000

Superposed magnetic field Hb [A/m]Recommended Soldering Conditions◆SURFACE MOUNT TYPE

●Recommended soldering heat conditions

Peak

Temperature [℃]Time maintained above 230℃
PreheatPreheatTime maintained above 217℃

Time maintained Time maintainedabove 217℃
above 230℃

Peak temp.

Reflow number

30 sec. max.

245℃ max.

2 times or less

150 to 180℃
60 sec. max.
120 sec. max.

Reﬂow should be performed twice or less.
Please ensure that the coil became cold enough to the room temperature
before the second reﬂow.
Time◆RADIAL LEAD TYPE

●Recommended soldering heat conditions

Preheat: 110 to 150℃ 120 seconds max.
Flow soldering: 260+5℃ 10+1 seconds max. (Or hand soldering: 380±10°C 10±1 seconds max.)

Product specifications in this catalog are subject to change without notice.Request our product specifications before purchase and/or use. Please use our products based on the information contained in this catalog and product specifications.

113

CAT. No. E1008Y 2024

NANOCRYSTALLINE/AMORPHOUS/DUST

Relative inductance [%]100