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ADP3197 Datasheet(PDF) 2 Page - Analog Devices |
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ADP3197 Datasheet(HTML) 2 Page - Analog Devices |
2 / 32 page ADP3197 Rev. 0 | Page 2 of 32 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ............................................. 8 Test Circuits....................................................................................... 9 Theory of Operation ...................................................................... 10 Start-Up Sequence...................................................................... 10 Phase Detection Sequence......................................................... 10 Master Clock Frequency............................................................ 11 Output Voltage Differential Sensing ........................................ 11 Output Current Sensing ............................................................ 11 Active Impedance Control Mode............................................. 11 Current Control Mode and Thermal Balance ........................ 11 Voltage Control Mode................................................................ 12 Current Reference ...................................................................... 12 Enhanced PWM Mode .............................................................. 12 Delay Timer................................................................................. 12 Soft Start ...................................................................................... 12 Current Limit, Short-Circuit, and Latch-Off Protection ...... 13 Dynamic VID.............................................................................. 13 Power-Good Monitoring........................................................... 13 Output Crowbar ......................................................................... 14 Output Enable and UVLO ........................................................ 14 Thermal Monitoring .................................................................. 14 Typical Application Circuit....................................................... 16 Applications Information .............................................................. 17 Setting the Clock Frequency..................................................... 17 Soft Start Delay Time................................................................. 17 Current-Limit Latch-Off Delay Times .................................... 17 Inductor Selection ...................................................................... 18 Current Sense Amplifier............................................................ 18 Inductor DCR Temperature Correction ................................. 19 Output Offset .............................................................................. 20 COUT Selection ............................................................................. 20 Power MOSFETs......................................................................... 21 Ramp Resistor Selection............................................................ 22 COMP Pin Ramp ....................................................................... 23 Current-Limit Setpoint.............................................................. 23 Feedback Loop Compensation Design.................................... 23 CIN Selection and Input Current di/dt Reduction.................. 25 Thermal Monitor Design .......................................................... 25 Shunt Resistor Design................................................................ 25 Tuning the ADP3197 ................................................................. 26 Layout and Component Placement ......................................... 27 Outline Dimensions ....................................................................... 29 Ordering Guide .......................................................................... 29 REVISION HISTORY 5/07—Revision 0: Initial Version |
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