Highly Integrated Gate Drivers for Si and GaN Power Transistors Intro Preface Contents Acronyms List of Abbreviations List of Symbols 1 Introduction 1.1 Motivation 1.2 Scope and Outline of This Book References 2 Fundamentals 2.1 Gate Drivers and Power Stages 2.1.1 Driver Configurations and Building Blocks 2.1.2 Gate Driver Output Stage 2.1.3 Basic Gate Driver Operation 2.1.4 Gate Loop Parasitics 2.1.5 Buffer Capacitor CDRV 2.1.6 Gate Driver Types 2.1.7 Efficiency of Resonant and Non resonant Gate Drivers 2.1.8 Power Transistor Switching Losses 2.2 Power Transistors and Applications 2.2.1 Silicon Transistors 2.2.2 GaN Transistor 2.2.3 GaN Versus Silicon Transistors 2.2.3.1 Losses 2.2.3.2 Safe Operating Area (SOA) 2.2.3.3 Gate Control 2.2.3.4 Applications 2.3 Gate Drive Schemes 2.3.1 Unipolar and Bipolar Gate Drive Scheme 2.3.2 Multi level Gate Drive Schemes and Active Gate Control 2.4 Gate Driver Supply and Signal Transmission 2.4.1 Isolated and Non isolated Gate Driver Supplies 2.4.2 Bootstrap Driver Supply 2.4.3 Signal Transmission 2.4.4 Combined Driver Supply and Signal Transmission 2.4.5 Coupling Currents Between Low Side and High Side Appendix A: Exemplary Gate Loop Inductance Values Appendix B: Losses Caused by Coss References 3 Gate Drivers Based on High Voltage Charge Storing (HVCS) 3.1 The Concept of HVCS 3.2 Circuit Options of a Gate Driver Output Stage Based on HVCS 3.3 Driver Implementation 3.3.1 Charge Pump Concept 3.3.2 Series Regulator 3.3.3 Level Shifters 3.3.3.1 Level Up Shifter 3.3.3.2 Level Down Shifter 3.3.4 Gate Driver Circuit 3.4 Further Applications of the Proposed Bootstrap Circuit 3.5 Bootstrap Capacitor Sizing 3.5.1 Sizing Equations 3.5.2 Sizing Equations for Stacked Bootstrap Capacitors 3.5.3 Sizing Example.