207037 FCQ 1/29/07 7:50 AM Page 3 Power Conversion Conversion & Line Filter Applications Applications Issue L February 2007CONTENTS Introduction Design Software....................................................37 General Properties..................................1 Thermal Aging Considerations..............................38 Tolerances..............................................4 DC Application Notes Physical Properties Graphic Design Aid................................41 Toroidal Cores........................................5 Core Selection Examples........................52 Composite Cores...................................14 DC Inductor Table..................................53 E Cores..................................................15 E Core Gapping......................................54 EH Cores, EM Cores.............................19 Effects of Ripple on DC Chokes.............56 E Core Bobbins, Toroidal Core Caps....20 AC Application Notes Bus Bar, U Cores...................................21 Power Factor Core Loss Calculations.....58 Pot Core Assemblies..............................22 60 Hz Filter Inductor..............................60 Bobbin Assemblies.................................23 Core Selection Example..........................62 Plain Cores.............................................24 60 Hz Inductor Table..............................63 Magnetic Characteristics Winding Table......................................................64 Magnetization Curves.............................25 Packaging Size and Weights.................................66 Curve Fit Formulas.................................28 Glossary................................................................67 Core Losses.............................................29 Additional Literature.............................................68 Sales Contacts.......................................................69 Copyright 2007, Micrometals Inc., Issue L, Printed February 2007 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. INTRODUCTION Iron powder as a core material has been widely used in RF applications for years. The distributed air gap properties inher- ent 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. 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. TEL. (714) 970-9400 MICROMETALS FAX (714) 970-0400