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Overview: The online seminar "Active Passives: Demystifying External components in Portable Power Systems" looks at external components used in switching regulators.
When considering passive components, a system designer often thinks of standard values with manufacturing tolerances which are typically +/-20% or +/-10% for inductors and capacitors. This is true in general, but in the actual application the component characteristics are much more complex. Hence the name "Active Passives". Applying dc bias to a ceramic capacitor, or current to an inductor, at a particular frequency changes the capacitance or inductance as well as the impedance. As switching frequencies go higher than 2MHz, extra care must be taken to control ac losses in inductors.
This seminar describes information that system designers and component procurement engineers can request from component manufacturers to improve the quality of switching regulator designs.
Length: 60 minutes
Published Date: December 2005
Topics covered in this online seminar include:
 Presenter: Mathew Jacob is an Applications Engineering Manager with National Semiconductor's Portable Power Group in Santa Clara, California. |
