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Texas Instruments SLVP089 manual Introduction

Models: SLVP089

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Introduction

2.1 Introduction

The SLVP089 is a dc-dc synchronous buck converter module that provides a 3.3-V output at up to 3 A with an input voltage range of 5.5 V to 12 V. The PWM controller is a TL5001 operating at a nominal frequency of 100 kHz. The TL5001 is configured for a maximum duty cycle of 100 percent and has short- circuit protection built in. The synchronous power stage consists of a PMOS switch and an NMOS synchronous rectifier.

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Texas Instruments SLVP089 manual Introduction

Contents

ConSLVverterP089SynchronousEvaluationModuleBuck Mixed-Signal Linear ProductsUser’s Guide 1998SLVU001A Printed in U.S.A07/98 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 InstrumentsTrademarks If You Need AssistanceFCC Warning 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 SchematicInput/Output Connections 1.3 Input/Output ConnectionsFigure 1-3. Input/Output Connections 1.4 Board Layout Figure 1-4. Board LayoutBoard Layout Hardware1-5Bill of Materials 1.5 Bill of MaterialsTable 1-1. Bill 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 = 12Figure 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 Filter+ 3 W 2.3.4 Synchronous Switch and Rectifier2.3.5 Snubber Network 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