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ADM1275-1ARQZ-R7 데이터시트(PDF) 2 Page - Analog Devices |
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ADM1275-1ARQZ-R7 데이터시트(HTML) 2 Page - Analog Devices |
2 / 48 page ADM1275 Data Sheet Rev. D | Page 2 of 48 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Applications Diagram ...................................................................... 1 General Description......................................................................... 1 Revision History ............................................................................... 3 Specifications..................................................................................... 4 Serial Bus Timing Characteristics.............................................. 7 Absolute Maximum Ratings............................................................ 8 Thermal Characteristics .............................................................. 8 ESD Caution.................................................................................. 8 Pin Configurations and Function Descriptions ........................... 9 Typical Performance Characteristics ........................................... 14 Functional Block Diagrams........................................................... 20 Theory of Operation ...................................................................... 21 Powering the ADM1275............................................................ 21 Current Sense Inputs.................................................................. 21 Current Limit Reference............................................................ 22 Setting the Current Limit (ISET) ............................................. 22 Soft Start ...................................................................................... 23 Foldback....................................................................................... 23 Timer............................................................................................ 24 Hot-Swap Retry Duty Cycle...................................................... 24 FET Gate Drive Clamps............................................................. 24 Fast Response to Severe Overcurrent ...................................... 25 Undervoltage and Overvoltage................................................. 25 ENABLE Input (ADM1275-3 Only)........................................ 25 Power Good................................................................................. 25 VOUT Measurement ................................................................. 26 FET Health .................................................................................. 26 Power Monitor ............................................................................ 26 PMBus Interface ............................................................................. 27 Device Addressing...................................................................... 27 SMBus Protocol Usage............................................................... 27 Packet Error Checking............................................................... 27 Partial Transactions on I2C Bus................................................ 27 SMBus Message Formats........................................................... 28 Group Commands ..................................................................... 29 Hot-Swap Control Commands................................................. 30 ADM1275 Information Commands........................................ 30 Status Commands ...................................................................... 30 GPO and Alert Pin Setup Commands .................................... 31 Power Monitor Commands ...................................................... 31 Warning Limit Setup Commands............................................ 32 PMBus Direct Format Conversion .......................................... 32 Voltage and Current Conversion using LSB values ............... 33 ADM1275 Alert Pin Behavior ...................................................... 34 Faults and Warnings .................................................................. 34 Generating an Alert ................................................................... 34 Handling/Clearing an Alert...................................................... 34 SMBus Alert Response Address ............................................... 35 Example Use of SMBus Alert Response Address................... 35 PMBus Command Reference........................................................ 36 OPERATION .............................................................................. 37 CLEAR_FAULTS........................................................................ 37 CAPABILITY.............................................................................. 37 VOUT_OV_WARN_LIMIT..................................................... 37 VOUT_UV_WARN_LIMIT..................................................... 37 IOUT_OC_WARN_LIMIT ...................................................... 37 IOUT_WARN2_LIMIT............................................................. 38 VIN_OV_WARN_LIMIT......................................................... 38 VIN_UV_WARN_LIMIT......................................................... 38 STATUS_BYTE .......................................................................... 38 STATUS_WORD........................................................................ 39 STATUS_VOUT......................................................................... 39 STATUS_IOUT .......................................................................... 39 STATUS_INPUT........................................................................ 40 STATUS_MFR_SPECIFIC........................................................ 40 READ_VIN................................................................................. 40 READ_VOUT............................................................................. 41 READ_IOUT .............................................................................. 41 PMBUS_REVISION .................................................................. 41 |
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