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A Novel Buck Converter with Constant Frequency Controlled Technique

Author

Listed:
  • Hsiao-Hsing Chou

    (Department of Electrical Engineering, National Penghu University of Science and Technology, Penghu 880011, Taiwan)

  • Hsin-Liang Chen

    (Department of Electrical Engineering, Chinese Culture University, Taipei 11114, Taiwan)

Abstract

This paper presents a buck converter with a novel constant frequency controlled technique, which employs the proposed frequency detector and adaptive on-time control (AOT) logic to lock the switching frequency. The control scheme, design concept, and circuit realization are presented. In contrast to a complex phase lock loop (PLL), the proposed scheme is easy to implement. With this novel technique, a buck converter is designed to produce an output voltage of 1.0–2.5 V at the input voltage of 3.0–3.6 V and the maximum load current of 500 mA. The proposed scheme was verified using SIMPLIS and MathCAD. The simulation results show that the switching frequency variation is less than 1% at an output voltage of 1.0–2.5 V. Furthermore, the recovery time is less than 2 μs for a step-up and step-down load transient. The circuit will be fabricated using UMC 0.18 μm 1P6M CMOS processes. The control scheme, design concept and circuit realization are presented in this paper.

Suggested Citation

  • Hsiao-Hsing Chou & Hsin-Liang Chen, 2021. "A Novel Buck Converter with Constant Frequency Controlled Technique," Energies, MDPI, vol. 14(18), pages 1-19, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5911-:d:637925
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    References listed on IDEAS

    as
    1. Myeong Woo Kim & Jae Joon Kim, 2021. "A PWM/PFM Dual-Mode DC-DC Buck Converter with Load-Dependent Efficiency-Controllable Scheme for Multi-Purpose IoT Applications," Energies, MDPI, vol. 14(4), pages 1-14, February.
    2. Pang-Jung Liu & Mao-Hui Kuo, 2021. "Adaptive On-Time Buck Converter with Wave Tracking Reference Control for Output Regulation Accuracy," Energies, MDPI, vol. 14(13), pages 1-14, June.
    3. Teuvo Suntio, 2018. "Dynamic Modeling and Analysis of PCM-Controlled DCM-Operating Buck Converters—A Reexamination," Energies, MDPI, vol. 11(5), pages 1-18, May.
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