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Low cost implementation of filterless class D audio amplifier with constant switching frequency

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5 Author(s)
Hyoung-sik Kim ; Sch. of Electr. Eng. & Comput. Sci., Kyungpook Nat. Univ., Taegu ; Sung-wook Jung ; Hwan-mok Jung ; Jang-kyoo Shin
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A new and simple configuration of filterless class D audio amplifier is proposed in this paper. The proposed filterless class D audio amplifier provides the advantages of both low total system cost and generation of synchronized 3-level pulse-width modulated (PWM) output. Moreover, as a result of hysteresis window variation, a close to constant switching frequency of PWM output is obtained. The proposed filterless class D audio amplifier is verified by the PSpice simulation and prototype circuit experiment

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IEEE Transactions on Consumer Electronics  (Volume:52 ,  Issue: 4 )