Multiloop control for fast transient DC–DC converter

A novel ac coupled feedback (ACCF) is proposed to alternatively realize fast transient response while inherently controlling the start-up in-rush current of a dc-dc switching converter. The proposed ACCF is modified from a conventional capacitor multiplier and connected between the outputs of the co...

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Main Authors: Zhou, Mi, Sun, Zhuochao, Low, Qiong Wei, Siek, Liter
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/143241
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1432412020-09-03T09:18:47Z Multiloop control for fast transient DC–DC converter Zhou, Mi Sun, Zhuochao Low, Qiong Wei Siek, Liter School of Electrical and Electronic Engineering VIRTUS, IC Design Centre of Excellence Engineering::Electrical and electronic engineering Current Mode DC-DC Converter A novel ac coupled feedback (ACCF) is proposed to alternatively realize fast transient response while inherently controlling the start-up in-rush current of a dc-dc switching converter. The proposed ACCF is modified from a conventional capacitor multiplier and connected between the outputs of the converter and the transconductance. With this supplemental feedback, the transient response has been significantly improved due to the gain-boosting effect around the compensator's midband. Moreover, the ACCF circuit assists to manage the ramping speed of the output voltage during power-up, thereby eliminating the bulky soft-start circuit. The new controller is very simple to implement and occupies a tiny footprint on-chip. A buck converter with the proposed scheme has been fabricated using the 0.18-μm standard CMOS process with an active silicon area of 0.573 mm 2 . Measurement results show that the output voltage rises linearly for a soft-start period of 1.05 ms according to the designed slope. Excellent load transient responses are achieved under different load current steps; the output voltage overshoot/undershoot of 60 mV settles down within 10 μs for a load variation from 50 μA to 1 A in 1 μs. Moreover, the proposed converter maintains both excellent load and line regulations of 0.018 mV/mA and 0.0056 mV/mV, respectively. Agency for Science, Technology and Research (A*STAR) Economic Development Board (EDB) Nanyang Technological University Accepted version The authors would like to thank the NTU-A∗STAR Silicon Technologies Centre of Excellence, Singapore, EDB, Singapore, and Maxim Integrated, Singapore, for their technical support. 2020-08-14T06:18:04Z 2020-08-14T06:18:04Z 2018 Journal Article Zhou, M., Sun, Z., Low, Q. W., & Siek, L. (2019). Multiloop control for fast transient DC–DC converter. IEEE Transactions on Very Large Scale Integration (VLSI) Systems, 27(1), 219-228. doi:10.1109/TVLSI.2018.2869430 1063-8210 https://hdl.handle.net/10356/143241 10.1109/TVLSI.2018.2869430 2-s2.0-85053628223 1 27 219 228 en IEEE Transactions on Very Large Scale Integration (VLSI) Systems © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: https://doi.org/10.1109/TVLSI.2018.2869430. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering
Current Mode
DC-DC Converter
spellingShingle Engineering::Electrical and electronic engineering
Current Mode
DC-DC Converter
Zhou, Mi
Sun, Zhuochao
Low, Qiong Wei
Siek, Liter
Multiloop control for fast transient DC–DC converter
description A novel ac coupled feedback (ACCF) is proposed to alternatively realize fast transient response while inherently controlling the start-up in-rush current of a dc-dc switching converter. The proposed ACCF is modified from a conventional capacitor multiplier and connected between the outputs of the converter and the transconductance. With this supplemental feedback, the transient response has been significantly improved due to the gain-boosting effect around the compensator's midband. Moreover, the ACCF circuit assists to manage the ramping speed of the output voltage during power-up, thereby eliminating the bulky soft-start circuit. The new controller is very simple to implement and occupies a tiny footprint on-chip. A buck converter with the proposed scheme has been fabricated using the 0.18-μm standard CMOS process with an active silicon area of 0.573 mm 2 . Measurement results show that the output voltage rises linearly for a soft-start period of 1.05 ms according to the designed slope. Excellent load transient responses are achieved under different load current steps; the output voltage overshoot/undershoot of 60 mV settles down within 10 μs for a load variation from 50 μA to 1 A in 1 μs. Moreover, the proposed converter maintains both excellent load and line regulations of 0.018 mV/mA and 0.0056 mV/mV, respectively.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Zhou, Mi
Sun, Zhuochao
Low, Qiong Wei
Siek, Liter
format Article
author Zhou, Mi
Sun, Zhuochao
Low, Qiong Wei
Siek, Liter
author_sort Zhou, Mi
title Multiloop control for fast transient DC–DC converter
title_short Multiloop control for fast transient DC–DC converter
title_full Multiloop control for fast transient DC–DC converter
title_fullStr Multiloop control for fast transient DC–DC converter
title_full_unstemmed Multiloop control for fast transient DC–DC converter
title_sort multiloop control for fast transient dc–dc converter
publishDate 2020
url https://hdl.handle.net/10356/143241
_version_ 1681057314302328832