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

Journal article (2023)

Authors

Y. Yang Electronic Instrumentation - EEMCS , University of Macau
Mo Huang University of Macau
S. Du Electronic Instrumentation - EEMCS
Rui P. Martins University of Macau
Yan Lu University of Macau
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: © 2023 Y. Yang, Mo Huang, S. Du, Rui P. Martins, Yan Lu
DOI: https://doi.org/10.1109/TCSI.2023.3307869
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Published Date

2023

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

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.

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