An accurate average inductor current limit method for peak current mode buck DC-DC converters

Yufei Sun; Yanzhao Ma; Kai Cui; Song Fang; Yue Yin; Xiaoya Fan

doi:10.1587/elex.17.20200047

An accurate average inductor current limit method for peak current mode buck DC-DC converters

Yufei Sun, Yanzhao Ma, Kai Cui, Song Fang, Yue Yin, Xiaoya Fan

School of Microelectronics

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

An accurate programmable average inductor current limit method for buck DC-DC converters with peak current mode (PCM) control is presented. A Gm-C filter is used to sense the voltage drop across a current sensing resistor in series with the inductor. Then, the voltage drop is converted into a current signal by a voltage-to-current (V2I) converter. The converted current signal is superposed on the output of the error amplifier to adjust the peak inductor current. The buck converter has been designed with 0.18μm BCD process. The current limit value is designed 1A/2A for the sensing resistor of 50mΩ/25mΩ, respectively. When the the equivalent load resistance steps from 10Ω to 2.5Ω/1.67Ω, the simulation results show that the average inductor current increases from 500mA to 0.9A/1.8A for the sensing resistor of 50mΩ/25mΩ, respectively.

Original language	English
Journal	IEICE Electronics Express
Volume	17
Issue number	6
DOIs	https://doi.org/10.1587/elex.17.20200047
State	Published - 2020

Keywords

Average inductor current feedback
Current limit
Gm-C filter

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10.1587/elex.17.20200047

Cite this

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title = "An accurate average inductor current limit method for peak current mode buck DC-DC converters",

abstract = "An accurate programmable average inductor current limit method for buck DC-DC converters with peak current mode (PCM) control is presented. A Gm-C filter is used to sense the voltage drop across a current sensing resistor in series with the inductor. Then, the voltage drop is converted into a current signal by a voltage-to-current (V2I) converter. The converted current signal is superposed on the output of the error amplifier to adjust the peak inductor current. The buck converter has been designed with 0.18μm BCD process. The current limit value is designed 1A/2A for the sensing resistor of 50mΩ/25mΩ, respectively. When the the equivalent load resistance steps from 10Ω to 2.5Ω/1.67Ω, the simulation results show that the average inductor current increases from 500mA to 0.9A/1.8A for the sensing resistor of 50mΩ/25mΩ, respectively.",

keywords = "Average inductor current feedback, Current limit, Gm-C filter",

author = "Yufei Sun and Yanzhao Ma and Kai Cui and Song Fang and Yue Yin and Xiaoya Fan",

year = "2020",

doi = "10.1587/elex.17.20200047",

language = "英语",

volume = "17",

journal = "IEICE Electronics Express",

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T1 - An accurate average inductor current limit method for peak current mode buck DC-DC converters

AU - Sun, Yufei

AU - Ma, Yanzhao

AU - Cui, Kai

AU - Fang, Song

AU - Yin, Yue

AU - Fan, Xiaoya

PY - 2020

Y1 - 2020

N2 - An accurate programmable average inductor current limit method for buck DC-DC converters with peak current mode (PCM) control is presented. A Gm-C filter is used to sense the voltage drop across a current sensing resistor in series with the inductor. Then, the voltage drop is converted into a current signal by a voltage-to-current (V2I) converter. The converted current signal is superposed on the output of the error amplifier to adjust the peak inductor current. The buck converter has been designed with 0.18μm BCD process. The current limit value is designed 1A/2A for the sensing resistor of 50mΩ/25mΩ, respectively. When the the equivalent load resistance steps from 10Ω to 2.5Ω/1.67Ω, the simulation results show that the average inductor current increases from 500mA to 0.9A/1.8A for the sensing resistor of 50mΩ/25mΩ, respectively.

AB - An accurate programmable average inductor current limit method for buck DC-DC converters with peak current mode (PCM) control is presented. A Gm-C filter is used to sense the voltage drop across a current sensing resistor in series with the inductor. Then, the voltage drop is converted into a current signal by a voltage-to-current (V2I) converter. The converted current signal is superposed on the output of the error amplifier to adjust the peak inductor current. The buck converter has been designed with 0.18μm BCD process. The current limit value is designed 1A/2A for the sensing resistor of 50mΩ/25mΩ, respectively. When the the equivalent load resistance steps from 10Ω to 2.5Ω/1.67Ω, the simulation results show that the average inductor current increases from 500mA to 0.9A/1.8A for the sensing resistor of 50mΩ/25mΩ, respectively.

KW - Average inductor current feedback

KW - Current limit

KW - Gm-C filter

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DO - 10.1587/elex.17.20200047

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An accurate average inductor current limit method for peak current mode buck DC-DC converters

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Keywords

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