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A Low EMI DC-DC Buck Converter with a Triangular Spread-Spectrum Mechanism

Author

Listed:
  • Jing-Yuan Lin

    (Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan)

  • Yi-Chieh Hsu

    (Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan)

  • Yo-Da Lin

    (Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan)

Abstract

In this paper, a triangular spread-spectrum mechanism is proposed to suppress the electromagnetic interference (EMI) of a DC-DC buck converter. The proposed triangular spread-spectrum mechanism, which is implemented in the chip, can avoid modifying the printed circuit board of switching regulators. In addition, a lower ripple of output voltage of switching regulators and a better system stability can be realized by the inductive DC resistance (DCR) current sensing circuit. The chip is fabricated by using TSMC 0.18-μm 1P6M CMOS technology. The chip area including PADs is 1.2 × 1.15 mm 2 . The input voltage range is 2.7~3.3 V and the output voltage is 1.8 V. The maximum load current is 700 mA. The off-chip inductor and capacitor are 3.3 μH and 10 μF, respectively. The experimental results demonstrate that the maximum spur of the proposed DC-DC buck converter with the triangular spread-spectrum mechanism improves to 14dBm. Moreover, the transient recovery time of step-up and step-down loads are both 5 μs. The measured maximum efficiency is 94% when the load current is 200 mA.

Suggested Citation

  • Jing-Yuan Lin & Yi-Chieh Hsu & Yo-Da Lin, 2020. "A Low EMI DC-DC Buck Converter with a Triangular Spread-Spectrum Mechanism," Energies, MDPI, vol. 13(4), pages 1-13, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:4:p:856-:d:321117
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    Cited by:

    1. Deniss Stepins & Aleksandrs Sokolovs & Janis Zakis & Ouseph Charles, 2023. "Wireless Battery Chargers Operating at Multiple Switching Frequencies with Improved Performance," Energies, MDPI, vol. 16(9), pages 1-18, April.
    2. Dobroslav Kováč & Tibor Vince & Matej Bereš & Ján Molnár & Jozef Dziak & Patrik Jacko & Irena Kováčová, 2022. "A Universal PSpice Simulation Model of a Switched Buck Voltage Regulator," Energies, MDPI, vol. 15(21), pages 1-19, November.

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