A New GaN-Based Device, P-Cascode GaN HEMT, and Its Synchronous Buck Converter Circuit Realization

Chih-Chiang Wu, Ching-Yao Liu, Guo-Bin Wang, Yueh-Tsung Shieh, Wei-Hua Chieng and Edward Yi Chang
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Chih-Chiang Wu: Mechanical and Mechatronics Systems Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
Ching-Yao Liu: Department of Mechanical Engineering, College of Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Guo-Bin Wang: Department of Mechanical Engineering, College of Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Yueh-Tsung Shieh: Department of Mechanical Engineering, College of Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Wei-Hua Chieng: Department of Mechanical Engineering, College of Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Edward Yi Chang: Department of Material Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan

Energies, 2021, vol. 14, issue 12, 1-23

Abstract: This paper attempts to disclose a new GaN-based device, called the P-Cascode GaN HEMT, which uses only a single gate driver to control both the D-mode GaN and PMOS transistors. The merit of this synchronous buck converter is that it can reduce the circuit complexity of the synchronous buck converter, which is widely used to provide non-isolated power for low-voltage and high-current supply to system chips; therefore, the power conversion efficiency of the converter can be improved. In addition, the high side switch using a single D-mode GaN HEMT, which has no body diode, can prevent the bi-directional flow and thus reduce the power loss and cost compared to a design based on a series of two opposite MOSFETs. The experiment shows that the proposed P-Cascode GaN HEMT efficiency is above 98% when it operates at 500 kHz with 6 W output. With the input voltage at 12 V, the synchronous buck converter provides an adjustable regulated output voltage from 1.2 V to 10 V while delivering a maximum output current of 2 A.

Keywords: synchronous buck converter; single gate driver; D-mode GaN HEMT; P-Cascode GaN HEMT (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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