An Integrated Driver With Bang-Bang Dead-Time Control and Charge Sharing Bootstrap Circuit for GaN Synchronous Buck Converter
Journal
IEEE Transactions on Power Electronics
Journal Volume
37
Journal Issue
8
Pages
9503-9514
Date Issued
2022
Author(s)
Abstract
This article proposes a high-frequency integrated gate driver for gallium nitride (GaN) synchronous buck converter. The proposed adaptive bang-bang dead-time control minimizes dead-time at any load condition. Thus, it mitigates the excessive power loss caused by GaN device reverse conduction in high-frequency applications. The proposed charge sharing bootstrap circuit ensures sufficient gate overdrive voltage with reduced chip area. Fabricated in a TSMC 0.25-μm BCD process, the driver integrated circuit enabled GaN-based buck converter to operate at 10 MHz switching frequency with minimal dead-time to as low as 0.4 ns under light load and heavy load conditions. Compared with fixed dead-time control, the proposed work improves around 5% efficiency under heavy load condition. The fully integrated bootstrap circuit with 100 and 60 pF (HV) capacitor obtained the lower than 0.6 V driving voltage drop with only 45% capacitance and around half of the voltage drop compared with a conventional bootstrap circuit. Besides, the proposed driver successfully tackled the parasitic ringing and dead-time overcharging issues in the GaN converter. © 1986-2012 IEEE.
Subjects
Bang-bang control; bootstrap circuit; buck converter; dead-time; driver; gallium nitride (GaN)
SDGs
Other Subjects
Bang bang control systems; Capacitance; DC-DC converters; Gallium nitride; Time delay; Timing circuits; Voltage control; Bang-bang; Bang-Bang control; Bootstrap circuits; Buck converters; Charge sharing; Dead time; Delay; Driver; Time control; III-V semiconductors
Type
journal article