Open AccessFixed‐frequency adaptive on‐time buck converter with ramp compensation
Author(s) -
Li QinQin,
Lai XinQuan,
Ye Qiang,
Yuan Bing
Publication year - 2016
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2015.0960
Subject(s) - buck converter , compensation (psychology) , control theory (sociology) , computer science , electrical engineering , engineering , voltage , psychology , artificial intelligence , control (management) , psychoanalysis
This study presents a fixed‐frequency adaptive on‐time buck converter with adaptive ramp compensation internally, which uses valley current‐mode control. The on‐time is obtained by feed forwarding input voltage and output voltage, which is easy to implement. The control method provides fast transient response, wide duty ratio and high efficiency for both heavy and light load. In a traditional adaptive on‐time buck converter, the output voltage ripple determines the moment when the main power metal oxide semiconductor field effect transistor is being turned on. Different from that way, this study proposes a new way by which the valley current flowing through the inductor determines the moment. This avoids the problem induced by insufficient output ripple when a low equivalent series resistance capacitor like ceramic output capacitor is used. An adequate and simple ramp compensation circuit is proposed to optimise its jitter performance for wide duty ratio applications.