Iec 60424 5 2009

IEC 60424 5 Edition 1 0 2009 02 INTERNATIONAL STANDARD Ferrite cores – Guide on the l imits of surface irregularities – Part 5 Planar cores IE C 6 0 4 2 4 5 2 0 0 9 (E ) ® THIS PUBLICATION IS COPYRIGH[.]

IEC 60424- 5

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Fer it e cores – Guide on t he l mit s of sur ace ir egularit ies –

Part 5: Planar- cores

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IEC 60424- 5

Edit io 1.0 2 0 -0

Fer it e cores – Guide on t he l mit s ofsur ace ir egularit ies –

Part 5: Planar- cores

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ELECT ROT ECHNICAL

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ICS 2 10 10

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IS N 2-8 18- 0 2-6

® R egistered t rademark f t he International Electrotec hnical Com ision

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CONTENTS

FOREWORD

3 1 Sco e 5

2 Normative referen es 5

3 Limits of s rf ace ir eg larities 6

3.1 Chips an rag ed ed es

6 3.1.1 Chips an rag ed ed es on the matin s races (se Fig res 1, 2 an 3) 6

3.1.2 Chips an rag ed ed es on other s races 7

3.2 Crac s .10 3.3 Flas 10 3 4 Pul -out 1

0 Fig re 1 – Chip location for planar EL-core 6

Fig re 2 – Chip location f or low profi e E-core 6

Fig re 3 – Chip location f or low profi e ER-core 6

Fig re 4 – Crac s an pul -out location for planar EL-core 10 Fig re 5 – Crac s an pul -out location for low profie E-core .1

Fig re 6 – Crac s an pul -out location for low profie ER-core .1

Fig re 7 – Referen e dimen ion f or EL-core .1

Fig re 8 – Ref eren e dimen ion f or E-core 12 Fig re 9 – Ref eren e dimen ion f or ER-core .13 Ta le 1 – Alowa le are s of c ips in mm 2 for planar EL-core 7

Ta le 2 – Alowa le are s of c ips in mm 2 for low profi e E-core 8

Ta le 3 – Alowa le are s of c ips in mm 2 for low profi e ER-core .8

Ta le 4 – Are an len th referen e for vis al in p ction 9

Ta le 5 – Limits of crac s f or planar EL-core .12

Ta le 6 – Limits of crac s for low profi e E-core .13

Ta le 7 – Limits of crac s f or low profi e ER-core .14

INTERNATIONAL ELECTROTECHNICAL COMMISSION

Part 5: Planar-cores

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International Stan ard IEC 6 4 4-5 has b en pre ared by IEC tec nical commite 51:

Mag etic comp nents an f er ite materials

The text of this stan ard is b sed on the f ol owin doc ments:

Ful inf ormation on the votin for the a proval of this stan ard can b fou d in the re ort on

votin in icated in the a ove ta le

This publcation has b en drafted in ac ordan e with the ISO/IEC Directives, Part 2

A l st of al p rts of the IEC 6 4 4 series, u der the general title Ferit e c res – Guid e o th

The commite has decided that the contents of this publ cation wi remain u c an ed u ti

the maintenan e res lt date in icated on the IEC we site u der "htp:/we store.iec.c " in

the data related to the sp cific publ cation At this date, the publ cation wi b

• with rawn,

• re laced by a revised edition, or

A bi n ual version of this publ cation may b is ued at a later date

FERRITE CORES –

Part 5: Planar-cores

This p rt of IEC 6 4 4 gives g idan e on al owa le lmits of s r ace ir eg larities a pl ca le

to planar cores in ac ordan e with the relevant generic sp cif i ation defined in IEC 6 4 4-1

The relation b twe n the main dimen ion of planar E-, ER- an EL-cores difer fom those

of stan ard cores For example, the width of planar cores is larger whi e the total heig t is

mu h smal er Also the thic nes of the leg is in most cases smaler than comp red to

stan ard cores Therefore the con ept of fixed referen e dimen ion to determine the len th

of crac lmits yield crac len th whic are not ac e ta le f or this typ of core This p rt of

IEC 6 4 4 fol ows another con e t whic relates the crac len th to dimen ion of the

s rf ace on whic the crac oc urs

Also the con e t to determine the maximum are of c ips b sed on the total matin s rf ace

f ai s in the case of planar cores The outer leg of planar cores are mu h thin er than those of

stan ard cores whic makes overla pin an gluin mu h more dif fic lt A sin le c ip of

maximum size on the outer leg may ris the fu ctional ty of the core set Therefore this

stan ard u es as a referen e the matin s rf ace on whic the c ip oc urs

Win in s of planar cores are often PCB’s whic are glued to the in er s rf aces of the planar

core For this re son the in er s r aces of the planar cores ne d to have a b t er q al ty than

the in er s r aces of stan ard cores This was taken into ac ou t by red cin the maximum

al owa le are of pul outs in the in er s races

This stan ard is con idered as a sectional sp cification u eful in the negotiation b twe n

f er ite core man facturers an u ers a out s race ir eg larities

The f ol owin ref eren ed doc ments are in isp n a le for the a pl cation of this doc ment

For dated ref eren es, only the edition cited a pl es For u dated referen es, the latest edition

of the referen ed doc ment (in ludin an amen ments) a pl es

IEC 6 4 4-1, F erit e c res – Guid e o th limits of sura e ire ularities – Part 1: Ge eral

sp cific t io

IEC 6 317-9, Fer ite c res – Dime sio s – P art 9: P la ar-c res

3 Limits of surf ac ir e ularities

3.1.1 Chips a d ra ge e ge on the mating s rfa e (s e Figure 1, 2 a d 3)

C1′ Mat in s ra e

R ag e e g s

C1

IEC 30/0

Figure 1 – Chip loc tion f or pla ar EL-core

C2 Mat in s ra e

R ag e e g s

C1 C1′

IEC 3610

Fig re 2 – Chip loc tion f or low pro le E-core

Wire slot are C2 Mat in s ra e

R ag e e g s

C1

C1′

IEC 362/0

Figure 3 – Chip loc tion f or low prof ile ER-core

Are s of the c ips located on the matin s rf aces (C1 an C1’ ir eg larities in Fig res 1, 2

an 3) s al not ex e d the f ol owin l mits:

– the c mulative are of the c ips s al b les than 4 % of the relevant matin s rf ace The

matin s r ace of e c outer leg an centre p st is con idered se arately; the alowa le

are s are rou ded to the fig res in Ta le 4 (Are an len th referen e for vis al

in p ction) an the minimum al owa le are is taken as 0,5 mm

2

to b distin uis a le to

– the total are of al c ips on al matin s r aces s al not ex e d the value given for

“overal c ip in on the matin s race” in Ta les 1, 2 or 3;

– the total len th of the rag ed ed es s al b les than 2 % of the p rimeter of the

relevant matin s rf ace

3.1.2 Chips a d ra ge e ge on other s rfa e

– the al owa le c ip in are s are doubled as comp red to the l mits f or the whole matin

s r aces (se Ta le 1 f or planar EL-corers, Ta le 2 f or low prof ile E-cores, Ta le 3 f or low

profie ER-cores);

– the total len th of the rag ed ed es s al b les than 2 % of the p rimeter of the smal er

adjoinin s race;

– c ips an rag ed ed es are not ac e ta le on the rid e of the clampin reces are ;

– c ips an rag ed ed es are not ac e ta le on the in er ed es of wire slot are

(C2 ir eg larity in Fig res 2 an 3)

The core sizes given in Ta les 1, 2 an 3 cor esp n to the cores defined in IEC 6 317-9,

an are an len th ref eren e f or vis al in p ction are given in Ta le 4

Table 1 – Al owable are s of c ips in mm

2

f or pla ar EL-core

Core siz

surfa e of o e o ter

leg

surfa e of c ntre

p st

Overal chip in o

matin surf ac

Other surf ac s

Table 2 – Al owable are s of c ips in mm

2

f or low profi e E-core

Core siz

surfa e of o e o ter

leg

surfa e of c ntre

p st

Overal chip in o

matin surf ac

Other surf ac s

Table 3 – Al owable are s of c ips in mm

2

f or low profi e ER-core

Core siz

surfa e of o e o ter

leg

surfa e of c ntre

p st

Overal chip in o

matin surf ac

Other surf ac s

Table 4 – Are a d le gth refere c f or vis al inspe tion

Surfa e

0,5 mm

2

1,0 mm

2

1,5 mm

2

2,0 mm

2

2,5 mm

2

3,0 mm

2

3,5 mm

2

4,0 mm

2

4,5 mm

2

5,0 mm

2

6,0 mm

2

7,0 mm

2

8,0 mm

2

9,0 mm

2

10,0 mm

2

Surfa e

12,5 mm 2

15,0 mm 2

17,5 mm 2

2 ,0 mm 2

2 ,0 mm 2

3 ,0 mm 2

3 ,0 mm 2

4 ,0 mm 2

4 ,0 mm 2

5 ,0 mm 2

Ec ele 1:1

3.2 Cra k

Dif ferent crac s are s own in Fig res 4, 5 an 6 In prin iple thre diff erent typ s of crac s

can b distin uis ed

a) Crac s whic are p ral el to the mag etic flu p th (S1, S2, S5, S5’, S5’ ) These

crac s are mag etical y not critical The maximum len th of a sin le crac is 3 % (1/3)

of the dimen ion of the relevant s rf ace whic is p ral el to the crac In the case of

multiple crac s the maximum c mulative len th doubles

b) Crac s whic are p rp n ic lar to the mag etic f l x p th (S3, S3’, S3’ , S4, S4’)

These crac s are mag etical y critical They may red ce the relative cros section of

the mag etic flu or ad an ad itional air ga into the mag etic circ it The maximum

total len th of crac s is 2 % (1/5) of the dimen ion of the relevant s rf ace whic is

p ral el to the crac

c) Crac s whic go f rom one ed e to another ed e (S6) These crac s may cau e

c ip in d rin the o eration in the circ it The lo se p rticles may cau e

malfu ction in the circ it Therefore this typ of crac is not ac e ta le in an case

The l mits for crac s are given in Ta les 5, 6 an 7

3.3 Fla h

There s al b no flas exten in fom the core into the wire slot

3.4 Pul -out

The pul -outs are a pl ca le only f or the in er s rf ace where the PCB is se ted (as s own in

Fig res 4, 5 an 6)

For planar EL-cores, low profi e E-cores an low profi e ER-cores, the c mulative are of pul

-outs of the core s al b les than 2 % of the total resp ctive s race are

Pul-o t

S1

S3

S2

S5

S4

S5′

S4′

S3″

S5″

S6

IEC 363/0

Fig re 4 – Cra k a d pul -out loc tion f or pla ar EL-core

S4

S5

S2

S1

S3

S5′

S3″

S5″

S4′

Pul-o t

S6

S3′

IEC 364/0

Figure 5 – Cra k a d pul -out loc tion f or low profi e E-core

S2

S5

S1

S4

S3″

S5″

Pul-o t

S5′

S4′

S3

S6

IEC 365/0

Figure 6 – Cra k a d pul -out loc tion f or low profi e ER-core

R2 8 pla e

B

1

D

F

2

C

R

1 R

1

R

1

= F

2

2

IEC 366/0

Table 5 – Limits of cra k f or pla ar EL-core

T pe

1

Referenc dimensio

2

Limits f or sin le cra k Limits f or multiple cra ks

1

3 % ( /3) of ef ere c dim 6 % (2/3) of efere c dim

2

2 % ( /5) of ef ere c dim 2 % ( /5) of efere c dim

1

2 % ( /5) of ef ere c dim 2 % ( /5) of efere c dim

1 – D 2 % ( /5) of ref ere c dim 2 % ( /5) of efere c dim

1 – D 2 % ( /5) of ref ere c dim 2 % ( /5) of efere c dim

1

3 % ( /3) of ef ere c dim 6 % (2/3) of efere c dim

1

Se Fig re 4

2

Se Fig re 7

B

1

D

C

IEC 367/0