PCB integrated inductors for low power DC/DC converter
Authors:
- M. DuffyMDM. Duffy
- T. O'DonnellT. O'Donnell
- P. McCloskeyPMP. McCloskey
- S.C.O. MathunaSMS.C.O. Mathuna
- 22 July 2003
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Electronics
- Vol. 18 (4) , 937-945
Abstract
This paper discusses the use of printed circuit board (PCB) integrated inductors for low power DC/DC buck converters. Coreless, magnetic plates and closed core structures are compared in terms of achievable inductance, power handling and efficiency in a footprint of 10 /spl times/ 10 mm/sup 2/. The magnetic layers consist of electroplated NiFe, so that the process is fully compatible with standard PCB process. Analytic and finite element method (FEM) methods are applied to predict inductor performance for typical current waveforms encountered in a buck converter. Conventional magnetic design procedures are applied to define optimum winding and core structures for typical inductor specifications. A 4.7 /spl mu/H PCB integrated inductor with dc current handling of up to 500 mA is presented. This inductor is employed in a 1.5 W buck converter using a commercial control integrated circuit (IC). The footprint of the entire converter measures 10 /spl times/ 10 mm/sup 2/ and is built on top of the integrated inductor to demonstrate the concept of integrated passives in power electronic circuits to achieve ultra flat and compact converter solutions.Keywords
This publication has 9 references indexed in Scilit:
- PCB integrated inductors for low power DC/DC converter2003
- Low temperature fabrication and characterization of integrated packaging-compatible, ferrite-core magnetic devices2002
- Design study and fabrication techniques for high power density microtransformers2002
- MCM-L integrated transformers for low power applications2002
- High-power-density MHz-switching monolithic DC-DC converter with thin-film inductor2002
- A low-profile power converter using printed-circuit board (PCB) power transformer with ferrite polymer compositeIEEE Transactions on Power Electronics, 2001
- High inductance planar transformersSensors and Actuators A: Physical, 2000
- Calculation of self- and mutual impedances in planar sandwich inductorsIEEE Transactions on Magnetics, 1997
- Design of microfabricated transformers and inductors for high-frequency power conversionIEEE Transactions on Power Electronics, 1996