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A fast transient response synchronous Buck converter with modified ripple-based control (MRBC) technique

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4 Author(s)
Yunwu Zhang ; Nat. ASIC Syst. Eng. Res. Center, Southeast Univ., Nanjing, China ; Jing Zhu ; Weifeng Sun ; Yangbo Yi

A new ripple controlled synchronous Buck converter featuring with improved transient response and low output voltage ripple is presented in this paper. The proposed modified ripple-based control (MRBC) technique adopting a novel ripple generate mechanism realizes the fast response ability by regulating the inductor current and output voltage through separate loops rapidly. In addition, a high-precision current sensor is utilized to form the current loop to improve the regulation accuracy. Meanwhile, the output voltage ripple is minimized by eliminating the requirement of a large ESR (equivalent series resistance) thanks to the introduced current loop. The proposed controller is implemented in a 0.5 μm BCD process of CSMC. Simulation results show that, during a 500 mA load current step change, the controller is able to regulate the output voltage to return to its nominal value within 2.6 μs with less than 50 mV overshoot/undershoot. The output voltage ripple is only 15 mV.

Published in:

Quality Electronic Design (ASQED), 2013 5th Asia Symposium on

Date of Conference:

26-28 Aug. 2013