Analysis of switching frequency variation in self-oscillating class-D audio amplifiers

被引：0
|
作者：
Kim, Eunhwan [1 ]
Mo, Hyunsun [1 ]
Kim, Daejeong [1 ]
机构：
[1] Kookmin Univ, Grad Sch, Dept Elect Engn, Seoul 136702, South Korea
来源：
IEICE ELECTRONICS EXPRESS | 2014年 / 11卷 / 19期
关键词：
class-D amplifier; self-oscillation; delta-sigma modulation; modulation depth;
D O I：
10.1587/elex.11.20140779
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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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页数：6
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