Texas Instruments SLVP089 Bedienungsanleitung

SLVP089 Synchronous Buck

Converter Evaluation Module

1998 Mixed-Signal Linear Products

User’s Guide

Printed in U.S.A.

07/98 SLVU001A

SLVP089 Synchronous Buck

Converter Evaluation Module

User’s Guide

Printed on Recycled Paper

Literature Number: SLVU001A

July 1998

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Related Documentation From Texas Instruments

iii

Read This First

Preface

Read This First

About This Manual

This user’s guide is a reference manual for the SLVP089 Synchronous Buck

ConverterEvaluationModuleusedtoevaluatetheperformanceoftheTL5001

PWMController. Thisdocumentprovides information to assistmanagersand

hardware engineers in application development.

How to Use This Manual

This manual provides the information and instructions necessary to design,

construct, operate, and understand the SLVP089. Chapter 1 describes and

lists the hardware requirements; Chapter 2 describes design considerations

andprocedures;andAppendixAcontainsthedatasheetfortheTL5001PWM

Controller

Related Documentation From Texas Instruments

The following books describe the TL5001 and related support tools. To obtain

acopyof anyoftheseTIdocuments,calltheTexasInstrumentsLiteratureRe-

sponseCenterat(800)477–8924.Whenordering,pleaseidentifythe bookby

its title and literature number.

TL5001 Pulse-Width-Modulation Control Circuits Data Sheet (Literature

number SLVS084C). It contains electrical specifications, available tem-

perature options, general overview of the device, and application in-

formation.

Designing with the TL5001C PWM Controller Application Report

(Literature number SLVA034).

If You Need Assistance

If You Need Assistance . . .

If you want to . .. Contact Texas Instruments at . . .

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about Texas Instruments

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for compliance with the limits of computing devices pursuant to subpart J of

part 15 of FCC rules, which are designed to provide reasonable protection

against radio frequency interference. Operation of this equipment in other en-

vironmentsmaycauseinterferencewithradiocommunications,inwhichcase

the user at his own expense will be required to take whatever measures may

be required to correct this interference.

Trademarks

TI is a trademark of Texas Instruments Incorporated.

Running Title—Attribute Reference

Chapter Title—Attribute Reference

Contents

1 Hardware 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Introduction 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Schematic 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Input/Output Connections 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Board Layout 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 Bill of Materials 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Test Results 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Design Procedure 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Introduction 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Operating Specifications 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Design Procedures 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.1 Duty Cycle Estimate 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.2 Output Filter 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.3 Power Switch 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.4 Synchronous Switch and Rectifier 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.5 Snubber Network 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.6 Controller Functions 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3.7 Loop Compensation 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference

Figures

1–1 Typical Synchronous Buck Converter 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2 Schematic Diagram 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–3 Input/Output Connections 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–4 Board Layout 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–5 Efficiency Vs Load 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–6 Power Switch Turn-On and Delay from Q2 Off 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–7 Power Switch Turn-Off and Delay to Q2 On 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–8 Inductor and Output Ripple 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 Power Stage Bode Plot 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Compensation Network 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Bode Plot 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 Output Response 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1–1 Bill of Materials 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2 Line/Load Regulation, 3.3-V (Total Variation) 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–3 Load Regulation and Ripple, 3.3-V (9-V Input) 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 Operating Specifications 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

Chapter Title—Attribute Reference

Hardware

The SLVP089 Synchronous Buck Converter Evaluation Module (SLVP089)

providesa method for evaluating theperformanceoftheTL5001pulse-width-

modulation(PWM)controller.Thedevicecontainsallofthecircuitrynecessary

to control a switch-mode power supply in a voltage-mode configuration. This

manual explains how to construct basic power conversion circuits including

the design of the control chip functions and the basic loop. This chapter in-

cludes the following topics:

Topic Page

1.1 Introduction 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Schematic 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Input/Output Connections 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Board Layout 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 Bill of Materials 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Test Results 1–8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

Introduction

1-2

1.1 Introduction

Synchronous buck converters provide the smaller size and higher efficiency

required by electronic equipment, particularly portable battery-operated

equipment. The synchronous buck converter reduces power losses

associated with a standard buck converter by substituting a power MOSFET

for the commutating diode. This reduces the typical 0.5-V to 1-V diode drop

to 0.3 V or less and increases system efficiency by up to 10 percent.

Continuous-current mode is desirable and is used in this EVM for the low

peak-to-average current ratio. Figure 1–1 shows a typical synchronous buck

converter.

Figure 1–1.Typical Synchronous Buck Converter

Controller

CR1

Transistor Q1 is the power switch and Q2 is the synchronous switch. A diode

inparallelwithQ2 allowsinductorcurrentflowduringthe deadtimewhenboth

transistors are turned off. If dead time is not present in this configuration, high

transient shoot-through currents will flow during the transition when one tran-

sistor is turning on and the other is turning off, usually resulting in destruction

of the power stage switches.

TheSLVP089evaluationmodulewillsupplyanominal3.3-Voutputoveraload

rangefrom0to3Ausingadcinputvoltageof5.5 Vto12V.Fullload efficiency

is typically 90 percent.

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