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Open AccessArticle

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

Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
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Author to whom correspondence should be addressed.
Energies 2020, 13(4), 856; https://doi.org/10.3390/en13040856
Received: 27 December 2019 / Revised: 8 February 2020 / Accepted: 14 February 2020 / Published: 15 February 2020
(This article belongs to the Special Issue Integration of Power Management Systems)
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 mm2. 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. View Full-Text
Keywords: constant on-time control; electromagnetic interference; spread-spectrum mechanism; buck converter constant on-time control; electromagnetic interference; spread-spectrum mechanism; buck converter
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Lin, J.-Y.; Hsu, Y.-C.; Lin, Y.-D. A Low EMI DC-DC Buck Converter with a Triangular Spread-Spectrum Mechanism. Energies 2020, 13, 856.

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