Capacitor-current-sensor calibration technique and application in a 4-phase buck converter with load-transient optimization

Szu Yu Huang, Kuan Yu Fang, Yi Wei Huang, Shih Hsiung Chien, Tai Haur Kuo

研究成果: Conference contribution

14 引文 斯高帕斯(Scopus)

摘要

For switching DC-DC converters, a large and rapid load-current transient ΔIload causes a large output voltage undershoot ΔVUS and long settling time ts if the transient responses are slow [1]. Since the output capacitor current ICo instantly reflects ΔIload, transient response optimization for minimizing ΔVUS and ts with given charging and discharging slopes of inductor current ILo can be achieved by obtaining an accurate ICo and well-controlling the ILo charging time tch and discharging time tdch [1]. However, ICo sensing accuracy is degraded if the output capacitor's impedance ZCo, comprising the capacitance CO, equivalent series resistance RESR and inductance LESL, varies with different output voltage VO, process variation, and/or PCB parasitics, leading to non-minimized ΔVUS and ts. An off-chip capacitor-current-sensor (CCS) calibration technique is reported in [2]; however, LESL is not considered, so the high-frequency information of ΔIload is inaccurately sensed when large and rapid ΔIload occurs. On the other hand, to well-control the tch and tdch of ILo, the transient-optimized feedback circuit reported in [1] minimizes ΔVUS and ts. However, optimization can be achieved only under fixed CO, output inductor LO, input voltage VIN, and VO.

原文English
主出版物標題2016 IEEE International Solid-State Circuits Conference, ISSCC 2016
發行者Institute of Electrical and Electronics Engineers Inc.
頁面228-229
頁數2
ISBN(電子)9781467394666
DOIs
出版狀態Published - 2016 二月 23
事件63rd IEEE International Solid-State Circuits Conference, ISSCC 2016 - San Francisco, United States
持續時間: 2016 一月 312016 二月 4

出版系列

名字Digest of Technical Papers - IEEE International Solid-State Circuits Conference
59
ISSN(列印)0193-6530

Other

Other63rd IEEE International Solid-State Circuits Conference, ISSCC 2016
國家United States
城市San Francisco
期間16-01-3116-02-04

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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