"Designing for EMC can help
ensure that radiated H-fields
from magnetic components are
minimal and do not cause any
disturbances on nearby power
lines or boards."
Bhanu Prakash Villuri
Lead Project Engineer,
Stanley Black & Decker, Inc.
Equipped with the knowledge of the noise characteristics and the necessary impedance,
designers can then make an appropriate selection of magnetics for achieving EMC compliance.
A magnetic component that is designed with EMC applications in mind often features detailed
measured curves in its datasheet to define its behavior over frequency. Trends such as impedance
and attenuation versus frequency are paramount to the design and selection of magnetic
components for EMC.
Bourns helps designers achieve EMC compliance by doing the following:
• Providing components with well-documented impedance and attenuation versus
frequency curves
• Working directly with customers to help them figure out the correct magnetic
components needed for their specific type of EMC
• Balancing design-related trade-offs such as performance and cost versus area
15 I Magnetic Components for EMC Compliance
For a magnetic component to perform well as a filter or common
mode choke, it needs to have a high impedance over a wide
frequency range. This is the key for magnetics in EMC applications.
Cathal Sheehan
Senior Technical Market Manager, Bourns, Inc.
