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Fast‐transient DC‐DC converter using a high‐performance error amplifier with a rapid output‐voltage control technique
Author(s) -
Javed Khurram,
Yeo Jaejin,
Lee Jaeseong,
Roh Jeongjin
Publication year - 2017
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2329
Subject(s) - slew rate , buck converter , transient response , voltage , transient (computer programming) , amplifier , control theory (sociology) , electronic engineering , operational amplifier , computer science , engineering , cmos , electrical engineering , control (management) , artificial intelligence , operating system
Summary This letter presents a method for improving the transient response of DC‐DC converters. The proposed technique replaces the conventional error amplifier with a combination of two different amplifiers to achieve a high loop gain and high slew rate. In addition, a rapid output‐voltage control circuit is employed to further reduce the recovery time. The proposed technique was applied to a four‐phase buck converter, and the chip was implemented using a 0.18‐μm CMOS process. The switching frequency of each phase was set at 2 MHz. Using a supply voltage of 2.7–5.5 V and an output voltage of 0.6–1.5 V, the regulator provided up to 2‐A load current with maximum measured recovery time of only 6.2 and 6.5 μs for increasing and decreasing load current, respectively. Copyright © 2017 John Wiley & Sons, Ltd.