Chin. J. Semicond. > 2007, Volume 28 > Issue 9 > 1477-1481

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Novel Driver for Class-D Audio Power Amplifier

Ye Qiang, Lai Xinquan, Dai Guoding, Wang Hui and Xu Luping

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Abstract: In order to improve driver efficiency,a high power supply in the design of class-D audio power amplifiers is needed to drive the high-side LDNMOS of H-bridges.A novel driver circuit is presented to solve this problem.A charge pump circuit is used in the design.With the operation of the chip,the power supply for the low-side LDNMOS transistor of the H-bridge is clamped at 5.5V by a charge pump capacitor,and the power supply for the high-side LDNMOS transistor of the H-bridge reaches 18.8V by a bootstrap capacitor.The bootstrapped power supply minimizes the number of high-voltage power-supply levels externally supplied to the system and improves the efficiency.A stereo class-D audio power amplifier with this circuit is implemented in a TSMC06BCD process.The results indicate that its efficiency could be as high as 89.67%,and the high-side and low-side RDSON is 320mΩ,PSRR is -62dB,and its THD is as low as 0.1%.This shows that the circuit works effectively.

Key words: class-D APAH-bridgecharge pumpbootstrapped capacitorefficiency

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    Received: 18 August 2015 Revised: 07 May 2007 Online: Published: 01 September 2007

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      Ye Qiang, Lai Xinquan, Dai Guoding, Wang Hui, Xu Luping. Novel Driver for Class-D Audio Power Amplifier[J]. Journal of Semiconductors, 2007, In Press. Ye Q, Lai X Q, Dai G D, Wang H, Xu L P. Novel Driver for Class-D Audio Power Amplifier[J]. Chin. J. Semicond., 2007, 28(9): 1477.Export: BibTex EndNote
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      Ye Qiang, Lai Xinquan, Dai Guoding, Wang Hui, Xu Luping. Novel Driver for Class-D Audio Power Amplifier[J]. Journal of Semiconductors, 2007, In Press.

      Ye Q, Lai X Q, Dai G D, Wang H, Xu L P. Novel Driver for Class-D Audio Power Amplifier[J]. Chin. J. Semicond., 2007, 28(9): 1477.
      Export: BibTex EndNote

      Novel Driver for Class-D Audio Power Amplifier

      • Received Date: 2015-08-18
      • Accepted Date: 2007-02-08
      • Revised Date: 2007-05-07
      • Published Date: 2007-08-31

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