A Robust High On-Duty Buck Converter Achieving a Peak Effective On-Duty of 0.976 With EMI Suppression

This article proposes a control method for buck converter used in a highly integrated system to ensure robust operation even when the converter operates with significantly high on-duty (D ON ). According to the D ON , the proposed controller automatically changes the operation mode between fixed swi...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2024-08, p.1-5
Main Authors: Oh, Young-Ju, Lee, Chan-Ho, Nam, Sang-Yun, Oh, Jun-Seok, Lee, Seok-Jun, Yang, Jun-Hyeok, Lee, Jaeseung, Hong, Sung-Wan
Format: Article
Language:English
Subjects:
Adaptive mode change
Buck converters
Electromagnetic interference
electromagnetic interference (EMI) suppression
Frequency conversion
high on-duty (D<sub xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">ON ) buck converter
integrated system
parasitic resistance
Semiconductor device measurement
Switches
Voltage control
Voltage measurement
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Summary:This article proposes a control method for buck converter used in a highly integrated system to ensure robust operation even when the converter operates with significantly high on-duty (D ON ). According to the D ON , the proposed controller automatically changes the operation mode between fixed switching frequency (f sw ) mode and fixed off-time (t OFF )mode. In the fixed t OFF mode, the controller dithers the f sw to suppress the electromagnetic interference (EMI). The proposed converter achieves maximum effective D ON of 0.976 at V DD 5 1.8 V, V O 5 1.7 V, and I O 5 500 mA. This converter also reduces switching harmonics by 10 dB in the fixed t OFF mode. The chip was fabricated in 130-nmprocess.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2024.3433576