CONTENTS
Introduction ..............................................................................
TDK Ferrite Cores in Switching Power Supplies......................
Selected Items of Legend ........................................................
Material Characteristics ...........................................................
PART I
E Cores
...................................................................................
EI Cores ...................................................................................
EE and EF Cores .....................................................................
EE and EI Bobbins...................................................................
EER Cores ...............................................................................
EER Bobbins ...........................................................................
ETD and EC Cores ..................................................................
ETD and EC Bobbins...............................................................
Original TDK Cores................................................................
PQ Cores .................................................................................
PQ Bobbins..............................................................................
LP Cores and Bobbins .............................................................
EPC Cores ...............................................................................
EPC Bobbins and Accessories ................................................
EP Cores and Bobbins ............................................................
RM Cores
................................................................................
RM Cores.................................................................................
RM Bobbins .............................................................................
SMD Cores..............................................................................
SMD Cores and Bobbins .........................................................
ET, UU and FT Cores
.............................................................
ET and UU cores .....................................................................
FT Cores ..................................................................................
T Cores
...................................................................................
Toroidal Cores (For Common Mode Choke)............................
Toroidal Cores (For General Use) ...........................................
Technical Data
.......................................................................
EI Cores ...................................................................................
EE Cores .................................................................................
EER Cores ...............................................................................
ETD Cores ...............................................................................
PQ Cores .................................................................................
LP Cores ..................................................................................
RM Cores.................................................................................
EPC Cores ...............................................................................
Maximum Number of Turns on Bobbins..............................
Wire Table ...............................................................................
The information included in this book is subject to change without notice resulting from technical
developments and product improvements.
Specifications which provide more details for the proper and safe use of the described
product are available upon request.
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147
PART II
1
Introduction
Since its outset in 1935, in the wake of the invention of ferrite,
TDK has aimed to develop its world leading electronic technology
in both material development and production. This accumulated
expertise in fine structural control technology has resulted in high
performance ferrite components. These components have
recently been in greater demand for electronic equipment
requiring reduction in size and weight.
TDK Ferrite Division engineers have successfully explored
every avenue of high performance ferrites, aiming to produce self-
contained energy sources for microelectronic equipment.
To this end, TDK has developed high frequency power ferrite,
such as PC33,PC40,PC44,PC45,PC46,PC47 and PC50 that are
identifiable by their excellent magnetic characteristics. It is these
high reliability ferrite
components that have largely contributed to reducing the size
of switching power supplies and DC to DC Converters for micro-
electronic equipment.
Other TDK endeavors deserving mention are ferrite for EMI
filters and common mode chokes with excellent frequency
characteristics. Not only have TDK’s researchers overcome the
theoretical limiting value of the high µ material’s operating fre-
quency, but they have also succeeded in developing a new
material HS72 and HS10 those are characterized by its high
impedance at high frequencies.
In order for you to take full advantage of these and other
materials shown in this booklet, TDK has developed a range of
cores and accessories to meet the need for miniature high per-
formance switching power supplies and DC to DC Converters.
TDK offers a comprehensive range of materials and core shapes
to meet all of your power requirements.
3
TDK Ferrite Cores in Switching Power Supplies
(Single forward converter)
Common mode choke coil
Active filer choke coil
Main power transformer
Smoothing choke coil
AC input
EMI/RFI filter
PFC Active filter
Output rectifier
smoothing circuit
DC output
Auxiliary power
circuit
Power switch
circuit
Control circuit
Auxiliary power transformer
Drive Transformer
Current transformer
Notes: • LP and EPC cores are ideal for use in thin transformers.
• LP cores are available in .5 and .7 inches in height (when mounted).
• EP cores are available in .5 and .65 inches in height (when mounted).
4
Selected Items of Legend
C
1
=
Σ
Core constant mm
–1
Ｌ½就是变压器磁芯里磁
场所路过的长度。简单
说，½把两个Ｅ字磁芯面
对面的靠在一起，变成
一个＂日＂字½，ＬＥ就是
日字上面一个口的周
长。
A
Ae
e
Ve
Acp
Acp min.
Acw
Aw
w
t
W
D
H
Effective cross-sectional area, mm
2
Effective magnetic path length, mm
有效磁芯½积Ve=Ae*Le
Effective core volume mm
3
Cross-sectional center leg/pole area, mm
2
Minimum cross-sectional center pole area, mm
2
Cross-sectional winding area of core, mm
2
Cross-sectional winding area of bobbin, mm
2
Average length of turns around bobbin, mm
Minimum thickness of bobbin inside which core is placed, including flanges, mm
Bobbin-core assembly dimensions
Bobbin-core assembly dimensions
Bobbin-core assembly dimensions
H
D
W
W
D
H
5
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