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ADP3207 Datasheet(PDF) 2 Page - ON Semiconductor |
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ADP3207 Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 29 page ADP3207 Rev. 1 | Page 2 of 29 | www.onsemi.com TABLE OF CONTENTS Features...............................................................................................1 Applications .......................................................................................1 General Description..........................................................................1 Functional Block Diagram...............................................................1 Revision History................................................................................2 Specifications .....................................................................................3 Test Circuits .......................................................................................6 Absolute Maximum Ratings ............................................................7 ESD Caution ..................................................................................7 Pin Configuration and Function Descriptions .............................8 Typical Performance Characteristics............................................10 Theory of Operation.......................................................................11 Number of Phases .......................................................................11 Operation Modes ........................................................................11 Switch Frequency Setting...........................................................12 Output Voltage Differential Sensing ........................................12 Output Current Sensing .............................................................12 Active Impedance Control Mode .............................................13 Current Control Mode and Thermal Balance.........................13 Voltage Control Mode ................................................................13 Power-Good Monitoring ...........................................................13 Power-Up Sequence and Soft Start ...........................................14 Soft Transient...............................................................................14 Current-Limit, Short-Circuit, and Latch-Off Protection ......15 Changing VID on-the-Fly .........................................................15 Output Crowbar..........................................................................15 Reverse Voltage Protection ........................................................16 Output Enable and UVLO.........................................................16 Thermal Throttling Control......................................................16 Application Information ................................................................19 Setting the Clock Frequency for PWM Mode ........................19 Soft-Start and Current-Limit Latch-Off Delay Times ...........19 PWRGD Delay Timer ................................................................19 Inductor Selection.......................................................................19 COUT Selection..............................................................................21 Power MOSFETs .........................................................................22 Ramp Resistor Selection ............................................................23 Setting the Switching Frequency for RPM Mode Operation of Phase 1..........................................................................................23 Current-Limit Setpoint ..............................................................24 Feedback Loop Compensation Design ....................................24 CIN Selection and Input Current DI/DT Reduction.................25 Soft Transient Setting .................................................................25 Selecting Thermal Monitor Components................................25 Tuning Procedure for ADP3207 ...............................................25 Layout and Component Placement..........................................27 Outline Dimensions........................................................................29 Ordering Guide ...........................................................................29 REVISION HISTORY 02/08—Rev 1: Conversion to ON Semiconductor 1/06—Revision 0: Initial Version |
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