NDLI: Evaluation of Trench-Gate Bipolar-Mode JFETs Used as High-Side Transistors in Low-Voltage Buck Converters

Content Provider	IEEE Xplore Digital Library
Author	Yu Wu Bo Tian Dongqing Hu Sin, J.K.O. Baowei Kang
Copyright Year	2008
Description	Author affiliation: Dept. of Electron. Sci & Tech, Beijing Univ. of Technol., Beijing (Yu Wu; Bo Tian; Dongqing Hu)
Abstract	For the first time, power loss comparison between 20V-rated devices including a trench MOSFET and four kinds of trench-gate bipolar-mode JFETs (TB-JFETs) was carried out with the help of simulation based on static analysis and mixed-mode dynamic analysis using an inductive switching circuit. With at least 14% power loss improvement at 1 MHz and 19% at 2 MHz compared to that of the trench MOSFET, the calculation results have generated the confidence to take normally-on TB-JFETs, especially the one with buried oxide (BOX) to reduce the gate-drain capacitance $C_{GD}$ which can provide 6% more improvement at both 1 and 2 MHz, as competitive candidates to replace trench MOSFETs as a high-side switch in low-voltage high-frequency buck converters. Experimental data of $C_{GD}$ for normally-on JFETs with and without BOX agree to the simulated results and account for the extra improvement in dynamic loss provided by the device with BOX. On the other hand, the normally-off devices (with and without BOX) always perform the worst within the commonly used frequency range, which implies their uselessness.
Starting Page	127
Ending Page	130
File Size	167801
Page Count	4
File Format	PDF
ISBN	9781424415328
DOI	10.1109/ISPSD.2008.4538914
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	JFETs Buck converters Power MOSFET MOSFET circuits Switches Analytical models Circuit simulation Switching circuits Power generation Capacitance
Content Type	Text
Resource Type	Article

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