A Level Shifter With Almost Full Immunity to Positive dv/dt for Buck Converters

Yunzhe Yang, Mo Huang, Sijun Du, Rui P. Martins, Yan Lu

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

High-frequency buck converters need a fast transition of switching nodes (high dv/dt). Such high dv/dt, especially the positive one, can cause malfunction of a conventional pulse-triggered active-coupled (PTAC) level shifter that is used to control the high-side NMOS switch. In this work, we first discuss the dv/dt immunity of conventional PTAC level shifters. Subsequently, we propose a new scheme to block the noise current during the dv/dt sequence, allowing an almost full immunity to the positive dv/dt. With this scheme, the maximum dv/dt is determined by how well the circuitry is protected from the overvoltage during the dv/dt sequence. We design a 20-V buck converter with this level shifter, fabricated in 180-nm BCD process. Experimental results show it works correctly under a 67-V/ns dv/dt.
Original languageEnglish
Pages (from-to)4595 - 4604
Number of pages10
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume70
Issue number11
DOIs
Publication statusPublished - 2023

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • buck converter
  • Buck converters
  • DC-DC converter
  • dv/dt immunity
  • High-voltage techniques
  • Latches
  • level shifter
  • Microelectronics
  • Switches
  • Transient analysis
  • Transistors

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