ADD5203 데이터 시트보기 (PDF) - Analog Devices

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ADD5203

8-String, White LED Driver with SMBus and PWM Input for LCD Backlight Applications

Analog Devices 

ADD5203

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Circuit Diagram ................................................................................ 3

Specifications..................................................................................... 4

Step-Up Switching Regulator Specifications............................. 4

LED Current Regulation Specifications .................................... 4

SMBus Specifications ................................................................... 5

General Specifications ................................................................. 6

Absolute Maximum Ratings............................................................ 7

Thermal Resistance ...................................................................... 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Typical Performance Characteristics ............................................. 9

REVISION HISTORY

5/10—Revision 0: Initial Version

Theory of Operation ...................................................................... 11

Current-Mode, Step-Up Switching Regulator Operation..... 11

Internal 3.3 V Regulator ............................................................ 11

Boost Converter Switching Frequency.................................... 11

Dimming Frequency (fPWM) ...................................................... 11

Current Source............................................................................ 11

Dimming Control Interface ...................................................... 11

PWM Dimming Mode .............................................................. 12

Safety Features ............................................................................ 12

SMBus Interface.......................................................................... 13

SMBus Register Description ..................................................... 15

External Component Selection Guide..................................... 17

Layout Guidelines....................................................................... 18

Typical Application Circuits ......................................................... 20

Outline Dimensions ....................................................................... 23

Ordering Guide .......................................................................... 23

Rev. 0 | Page 2 of 24

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