TY - JOUR
T1 - Digital V2Constant ON-Time Control Buck Converter with Adaptive Voltage Positioning and Automatic Calibration Mechanism
AU - Hu, Kai Yu
AU - Tsai, Chien Hung
AU - Tsai, Chien Wu
N1 - Funding Information:
Manuscript received July 9, 2020; revised September 6, 2020 and November 5, 2020; accepted November 13, 2020. Date of publication November 18, 2020; date of current version February 5, 2021. This work was supported in part by the Ministry of Science and Technology (MOST), R.O.C. Project MOST 108-2221-E-006-145-MY2 and 109-2622-8-006-017-TA and in part by the Chip Fabrication Services from Taiwan Semiconductor Research Institute (TSRI), R.O.C. Recommended for publication by Associate Editor M. Rodriguez. (Corresponding author: Kai-Yu Hu.) Kai-Yu Hu and Chien-Hung Tsai are with the Department of Electrical Engineering, National Cheng Kung University, Tainan City 701, Taiwan (e-mail: s972882@gmail.com; chtsai@ee.ncku.edu.tw).
Publisher Copyright:
© 1986-2012 IEEE.
PY - 2021/6
Y1 - 2021/6
N2 - This article presents a digital V2 constant on-time control buck converter with adaptive voltage positioning (AVP) and automatic closed-loop output impedance (Zoc) calibration for advanced system-on-a-chip processors. To ensure that the output voltage deviation remains within the desired range, the system is equipped with AVP. For an optimal AVP design, the system includes a second-order digital inductor current sensor for deriving a constant Zoc within a wide bandwidth. A detailed system-level analysis was performed to design the proposed control architecture. Considering the inevitable variation and aging of power stage components, the system is equipped with an online real-time Zoc calibration mechanism established to ensure the performance of AVP control. A prototype chip was fabricated using a 90-nm complementary metal-oxide-semiconductor (CMOS) process. The digital controller was fully realized using a standard cell library. Under a 0.9-A load transient, the measured output voltage could be adequately constrained within a specified 1.1-V and 110-mV AVP window.
AB - This article presents a digital V2 constant on-time control buck converter with adaptive voltage positioning (AVP) and automatic closed-loop output impedance (Zoc) calibration for advanced system-on-a-chip processors. To ensure that the output voltage deviation remains within the desired range, the system is equipped with AVP. For an optimal AVP design, the system includes a second-order digital inductor current sensor for deriving a constant Zoc within a wide bandwidth. A detailed system-level analysis was performed to design the proposed control architecture. Considering the inevitable variation and aging of power stage components, the system is equipped with an online real-time Zoc calibration mechanism established to ensure the performance of AVP control. A prototype chip was fabricated using a 90-nm complementary metal-oxide-semiconductor (CMOS) process. The digital controller was fully realized using a standard cell library. Under a 0.9-A load transient, the measured output voltage could be adequately constrained within a specified 1.1-V and 110-mV AVP window.
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U2 - 10.1109/TPEL.2020.3039061
DO - 10.1109/TPEL.2020.3039061
M3 - Article
AN - SCOPUS:85097191462
SN - 0885-8993
VL - 36
SP - 7178
EP - 7188
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 6
M1 - 9263387
ER -