NDLI: Techniques of Dual-Path Error Amplifier and Capacitor Multiplier for On-Chip Compensation and Soft-Start Function

Content Provider	IEEE Xplore Digital Library
Author	Pang-Jung Liu Chih-Yao Hsu Yi-Hsiang Chang
Copyright Year	1986
Abstract	Techniques of a dual-path error amplifier and two capacitor multipliers for providing on-chip frequency compensation and soft-start function are proposed in this paper. The concept of the dual-path error amplifier is to use two currents to charge and discharge a compensation capacitor simultaneously. As a result, the equivalent capacitance is enlarged significantly with little additional power and silicon area. The dc-dc converter with the dual-path architecture also has great performance in transient response because the compensation capacitor is reduced significantly. For the soft-start function, the subtractive-type and time-average capacitor multipliers are used to relax the restriction of the capacitance and the charging current. Consequently, it is easy to integrate the soft-start capacitance into a chip and the output overshoot voltage can be suppressed. A prototype converter fabricated with TSMC 0.35-μm 2P4M CMOS process verifies the effectiveness of the techniques of a dual-path error amplifier and two capacitor multipliers. Experimental results demonstrate the converter stability, transient response, and soft-start function. The transient recovery time and transient ripple are less than 20 μs and 25 mV, respectively, for the load current swing from 50 to 500 mA. Moreover, the soft-start time is up to 8 ms. With the proposed techniques, the external pins of the dc-dc converters are minimized and their performance is improved significantly.
Sponsorship	IEEE Power Electronics Society
Starting Page	1403
Ending Page	1410
Page Count	8
File Size	1386520
File Format	PDF
ISSN	08858993
Volume Number	30
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitors Capacitance Delays System-on-chip Output feedback Voltage control Equations transient response Capacitor multiplier dc¿dc converter frequency compensation soft-start function
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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