IEICE Electronics Express
Online ISSN : 1349-2543
LETTER
Analysis of switching frequency variation in self-oscillating class-D audio amplifiers
Eunhwan KimHyunsun MoDaejeong Kim
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JOURNALS FREE ACCESS

2014 Volume 11 Issue 19 Pages 20140779

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Abstract

In this letter, a mathematical model in self-oscillating class-D audio amplifiers is proposed to describe the switching frequency variation as a fuction of the modulation depth. It is alleged in a very simple form which can be applied to any general structure adopting phase-shifting in the feedback filter, time delay of the loop, and the hysteresis window at the comparator. The main focus is set on the analysis of the phase-shifting filter which shows the least dependency on the modulation depth, which is not yet revealed.

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© 2014 by The Institute of Electronics, Information and Communication Engineers
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