A hybrid inductor‐current sensor with fast response and high accuracy using online calibration for high‐frequency BUCK DC‐DC converters

Author:

Yuan Wentai1ORCID,Xie Weitao1,Chen Zhijian1,Lin Xiaoling2,Tang Xian3,Zheng Yanqi1ORCID

Affiliation:

1. School of Microelectronics South China University of Technology Guangzhou China

2. The Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China

3. Graduate School at Shenzhen Tsinghua University Shenzhen China

Abstract

AbstractThis paper introduces a hybrid inductor‐current sensor with fast response and high accuracy using online calibration for 25 MHz BUCK DC‐DC converter. The proposed inductor‐current sensor combines the high accuracy of the senseFET sensing method with the lossless and real‐time response characteristics of the RC filter technique. Comparing to exist techniques, the proposed calibration scheme can make filter coefficient converge even in unsteady state, which improve its effectiveness in practical application. Moreover, the proposed inductor‐current sensor utilizes sample‐based senseFET‐based current sensing to offer calibration reference, which avoid the use of high bandwidth amplifier. Digital current balance control is seamlessly integrated into the 25 MHz 2‐phase digital adaptive time‐controlled (AOT) BUCK DC‐DC converter through the utilization of the proposed hybrid inductor‐current sensor. The 2‐phase BUCK DC‐DC converter is implemented in a standard 0.18‐µm CMOS process. After online calibration, proposed hybrid inductor‐current sensor outputs a full‐wave waveform with high accuracy and low propagation delay of only 9 ns in post‐layout simulation.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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