Design of DC-DC buck converter with integrated over-current protection based on power AlGaN/GaN MIS-HEMT configuration

Summary form only given. In order to examine the feasibility of full wide-bandgap GaN-based converters in aerospace power conversion applications, this paper proposes a monolithic DC-DC buck converter design with integrated high-side gate driver and over-current protection based on AlGaN/GaN MIS-HEMT configuration. After model calibration of the DC and transient behaviors with fabricated normally-on and normally-off AlGaN/GaN MIS-HEMT devices, the DC-DC buck converter is simulated. The circuit converts the input 100 V down to an adjustable 10 V - 80 V range at 1 MHz switching frequency. The over-current protection function can properly protect the converter at a preset 1 A threshold within 1.2 μs. These results verify the performance of the proposed all-GaN DC-DC power converter design.