ADM1041AARQZ Просмотр технического описания (PDF) - Analog Devices

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ADM1041AARQZ

Secondary-Side Controller with Current Share and Housekeeping

Analog Devices 

ADM1041A

TABLE OF CONTENTS

General Description ......................................................................... 3

Sample Application Circuit Description ................................... 3

Specifications..................................................................................... 6

Absolute Maximum Ratings.......................................................... 13

Thermal Characteristics ............................................................ 13

ESD Caution................................................................................ 13

Pin Configuration and Function Descriptions........................... 14

Terminology ................................................................................ 16

Theory of Operation ...................................................................... 18

Power Management.................................................................... 18

Gain Trimming and Configuration ......................................... 18

Differential Remote Sense Amplifier....................................... 19

Set Load Voltage ......................................................................... 19

Load Overvoltage (OV) ............................................................. 19

Local Voltage Sense .................................................................... 19

Local Overvoltage Protection (OVP) ...................................... 19

Local Undervoltage Protection (UVP) .................................... 19

False UV Clamp.......................................................................... 19

Voltage Error Amplifier............................................................. 20

Main Voltage Reference ............................................................. 20

Current-Sense Amplifier ........................................................... 20

Current Sensing .......................................................................... 21

Current-Transformer Input ...................................................... 21

Current-Sense Calibration ........................................................ 21

Current-Limit Error Amplifier................................................. 21

Overcurrent Protection ............................................................. 22

Current Share .............................................................................. 22

Current-Share Offset.................................................................. 22

ISHARE Drive Amplifier ................................................................ 22

Differential Sense Amplifier ..................................................... 22

REVISION HISTORY

7/05—Revision 0: Initial Version

ISHARE Error Amplifier................................................................. 22

ISHARE Clamp ................................................................................ 22

SHARE_OK Detector ................................................................ 23

Pulse/ACSENSE2............................................................................. 24

Pulse ............................................................................................. 24

ACSENSE.......................................................................................... 24

OrFET Gate Drive ...................................................................... 25

Oscillator and Timing Generators ............................................... 27

Logic I/O and Monitor Pins...................................................... 27

SMBus Serial Port....................................................................... 30

Microprocessor Support............................................................ 30

Broadcasting................................................................................ 30

SMBus Serial Interface............................................................... 30

General SMBus Timing ............................................................. 31

SMBus Protocols for RAM and EEPROM.............................. 33

SMBus Read Operations ........................................................... 35

SMBus Alert Response Address (ARA) .................................. 36

Support for SMBus 1.1............................................................... 36

Layout Considerations............................................................... 36

Power-Up Auto-Configuration ................................................ 36

Extended SMBus Addressing.................................................... 37

Backdoor Access......................................................................... 37

Register Listing ............................................................................... 38

Detailed Register Descriptions ..................................................... 39

Manufacturing Data................................................................... 48

Microprocessor Support ................................................................ 49

Test Name Table.............................................................................. 51

Outline Dimensions ....................................................................... 53

Ordering Guide .......................................................................... 53

Rev. 0 | Page 2 of 56

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