Monolithic GaN-Based Driver and GaN Switch With Diode-Emulated GaN Technique for 50-MHz Operation and Sub-0.2-ns Deadtime Control

Abstract

In this article, the proposed monolithic gallium nitride (GaN)-based driver uses the diode-emulated technique to reduce reverse conduction through a meta-stable fast (MSF) comparator with sub-0.2-ns deadtime. In addition, an active bootstrap controller with a fast discharge loop is used to reduce parasitic effects to improve the driving capability, thereby increasing the switching frequency. Furthermore, the proposed gate driver with dual <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$dv/dt$ </tex-math></inline-formula> control can reduce the gate-ringing during turn-on/turn-off. Experimental results show that the GaN-based monolithic driver can achieve an operating frequency of 50 MHz and a slew rate of 120 V/ns. At 50 MHz, the conversion of 48-to-5 V can achieve a peak efficiency of 95.4% at the load current of 3.5 A.