207037_FCQ 1/29/07 7:50 AM Page 3 Power Conversion & Line Filter Applications Issue L February 2007 CONTENTS Introduction General Properties.

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Power Conversion & Line Filter Applications

Calculo De Transformadores

Issue L February 2007

CONTENTSIntroduction General Properties..................................1 Tolerances..............................................4 Physical Properties Toroidal Cores........................................5 Composite Cores...................................14 E Cores..................................................15 EH Cores, EM Cores.............................19 E Core Bobbins, Toroidal Core Caps....20 Bus Bar, U Cores...................................21 Pot Core Assemblies..............................22 Bobbin Assemblies.................................23 Plain Cores.............................................24 Magnetic Characteristics Magnetization Curves.............................25 Curve Fit Formulas.................................28 Core Losses.............................................29Copyright 2007, Micrometals Inc., Issue L, Printed February 2007

Design Software....................................................37 Thermal Aging Considerations..............................38 DC Application Notes Graphic Design Aid................................41 Core Selection Examples........................52 DC Inductor Table..................................53 E Core Gapping......................................54 Effects of Ripple on DC Chokes.............56 AC Application Notes Power Factor Core Loss Calculations.....58 60 Hz Filter Inductor..............................60 Core Selection Example..........................62 60 Hz Inductor Table..............................63 Winding Table......................................................64 Packaging Size and Weights.................................66 Glossary................................................................67 Additional Literature.............................................68 Sales Contacts.......................................................69

MICROMETALS, INC. established in 1951, is committed to supplying high quality iron powder cores to meet the needs of the electronics industry. As the technology has changed, new shapes, sizes and materials have been introduced to become industry standards.

MICROMETALS

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TEL. (714) 970-9400 FAX (714) 970-0400Iron powder as a core material has been widely used in RF applications for years. The distributed air gap properties inherent in iron powder cores also make them extremely well-suited for a variety of energy storage inductor applications. Iron powder is a cost-effective design alternative to molypermalloy powder (MPP), high flux, or sendust cores. It can also be used in place of ferrites and iron-alloy laminations requiring a gap. The iron powder cores described in this catalog are typically used for DC output chokes, differential-mode input chokes, power factor correction inductors, continuous-mode flyback inductors, light dimmer chokes and other EMI/ RFI applications.

INTRODUCTION

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WARRANTY

Parts are warranted to conform to the specifications in the latest issue of this catalog. Micrometals liability is limited to return of parts and repayment of price; or replacement of nonconforming parts. Notice of nonconformance must be made within 30 days after delivery. Before using these products, buyer agrees to determine suitability of the product for their intended use or application. Micrometals shall not be liable for any other loss or damage, including but not limited to incidental or consequential damages.

GENERAL MATERIAL PROPERTIESMaterial Mix No. -2 -8 -14 -18 -19 -26 -30 -34 -35 -40 -45 -52 Reference Permeability (0) 10 35 14 55 55 75 22 33 33 60 100 75 Material Density (g/cm3) 5.0 6.5 5.2 6.6 6.8 7.0 6.0 6.2 6.3 6.9 7.2 7.0 Relative Cost 2.7 5.0 3.6 3.4 1.7 1.0 1.4 1.5 1.4 1.0 2.6 1.2

INTRODUCTIONColor* Code Red/Clear Yellow/Red Black/Red Green/Red Red/Green Yellow/White Green/Gray Gray/Blue Yellow/Gray Green/Yellow Black/Black Green/Blue

* All Micrometals color codes are protected by US Trademark law. Formal registration numbers have been issued for the -8, -18, -26 and -52 color codes by the United States Patent and Trademark office.

CORE LOSS COMPARISON (mW/cm3) Material 60 Hz 1kHz 10kHz 50kHz 100kHz 500kHz Mix No. @5000G @1500G @500G @225G @140G @50G-2 -8 ** -14 -18 -19 -26 -30 -34 -35 -40 -45 -52 19 45 19 48 31 32 37 29 33 29 26 30 32 64 32 72 60 60 80 61 73 62 49 56 32 59 32 70 72 75 120 87 109 93 60 68 28 48 29 63 71 89 149 100 137 130 69 72 19 32 21 46 54 83 129 82 119 127 61 58 12 15 17 37 49 139 129 78 123 223 92 63

PERMEABILITY WITH DC BIAS HDC = 50 Oersteds %0 effective99 91 99 74 74 51 91 84 84 62 46 59 10.0 31.9 14.0 40.7 40.7 38.3 20.0 27.7 27.7 37.2 46.0 44.3

** Revised since last issue.

MATERIAL APPLICATIONSTypical Application Light Dimmer Chokes 60 Hz Differential-mode EMI Line Chokes DC Chokes: