A 48-to-1 V, 5-A Low-Frequency Step-Down Converter With Bidirectional Recycle Converter for Ripple Cancellation and Transient Acceleration

IEEE Transactions on Power Electronics 2026

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Authors: Ching-Tao Hsu, Yu-Tse Shih, M.L. Liu, Wei-Yao Wan, Ming-Che Tu, Ke‐Horng Chen, Xi Zhu, Ying-Hsi Lin, Shian-Ru Lin, Tsung-Yen Tsai
DOI: 10.1109/tpel.2026.3670020
Cited by: 0
References: 20

Abstract

This work proposes a low-frequency double step-down (DSD) converter integrated with a GaN-based high-frequency recycle converter. The proposed architecture ensures a sufficiently long on-time of 400 ns while achieving effective output ripple suppression, reducing ripple to 6 mV—an 11× improvement over conventional designs. Leveraging high switching frequency and enhanced inductor slew capability, the converter delivers fast transient response. For a 1-A to 5-A load step, the output exhibits a 69-mV undershoot with a 907-ns recovery time; conversely, a 5-A to 1-A step results in a 74-mV overshoot and an 848-ns recovery time, corresponding to 8.2 mV/A performance. The proposed system achieves a peak efficiency of 96.51%.

Fields of Study & Subjects

Advanced DC-DC Converters Analog and Mixed-Signal Circuit Design Advanced Power Amplifier Design

Publication details

Journal / source
IEEE Transactions on Power Electronics
Volume
41
Issue
9
Pages
14566–14578
Publication date
3 March 2026
Language
EN