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Texas Instruments SLVP089 6. Power Switch Turn-On and Delay from Q2 Off, Test Results, V Cc =

Models: SLVP089

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Image 16

Test Results

Figure 1–6. Power Switch Turn-On and Delay from Q2 Off

VCC = 12 V

IO = 1.5 A

Q1 DRAIN

5 V/DIV

Q2 GATE

5 V/DIV

20 ns/Div

Figure 1–7. Power Switch Turn-Off and Delay to Q2 On

VCC = 12 V

IO = 1.5 A

Q1 Drain

5 V/Div

Q2 Gate

5 V/Div

20 ns/Div

1-8

Page 16

Image 16

Texas Instruments SLVP089 manual 6. Power Switch Turn-On and Delay from Q2 Off, 7. Power Switch Turn-Off and Delay to Q2 On

Contents

ConSLVverterP089SynchronousEvaluationModuleBuck Mixed-Signal Linear ProductsUser’s Guide 199807/98 Printed in U.S.ASLVU001A SLVP089 Synchronous Buck Converter Evaluation Module User’s Guide Literature Number SLVU001A JulyIMPORTANT NOTICE How to Use This Manual Read This FirstAbout This Manual Related Documentation From Texas InstrumentsFCC Warning If You Need AssistanceTrademarks Contents 1.1 Introduction 1.2 Schematic 1.3 Input/Output Connections2.1 Introduction 2.2 Operating Specifications 2.3 Design Procedures 2.3.1 Duty Cycle Estimate 2.3.2 Output Filter 2.3.3 Power SwitchFigures TablesHardware ChapterPage Topic1.1 Introduction Figure 1-1. Typical Synchronous Buck Converter1.2 Schematic Figure 1-2. Schematic DiagramHardware SchematicFigure 1-3. Input/Output Connections 1.3 Input/Output ConnectionsInput/Output Connections 1.4 Board Layout Figure 1-4. Board LayoutBoard Layout Hardware1-5Table 1-1. Bill of Materials 1.5 Bill of MaterialsBill of Materials 1.6 Test Results Table 1-2. Line/Load Regulation, 3.3-V Total VariationTable 1-3. Load Regulation and Ripple, 3.3-V 9-V Input Figure 1-5. Efficiency Vs LoadFigure 1-6. Power Switch Turn-On and Delay from Q2 Off Figure 1-7. Power Switch Turn-Off and Delay to Q2 OnTest Results V CC =Figure 1-8. Inductor and Output Ripple Test ResultsHardware1-9 2-ACPage Design Procedure ChapterPage Topic2.1 Introduction 2.2 Operating Specifications Table 2-1. Operating SpecificationsOperating Specifications Design Procedure2.3 Design Procedures 2.3.3 Power Switch2.3.1 Duty Cycle Estimate 2.3.2 Output Filter2.3.5 Snubber Network 2.3.4 Synchronous Switch and Rectifier+ 3 W 2.3.6 Controller Functions 2.3.7 Loop Compensation1 mA 0.001Figure 2-1. Power Stage Bode Plot + DD V OFigure 2-2. Compensation Network Figure 2-3. Bode Plot Figure 2-4. Output Response