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

Jing-Yuan Lin, Yi-Chieh Hsu and Yo-Da Lin
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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

Energies, 2020, vol. 13, issue 4, 1-13

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-?m 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 ?H and 10 ?F, 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 ?s. The measured maximum efficiency is 94% when the load current is 200 mA.

Keywords: constant on-time control; electromagnetic interference; spread-spectrum mechanism; buck converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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