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ADP1621 Scheda tecnica(PDF) 2 Page - Analog Devices |
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ADP1621 Scheda tecnica(HTML) 2 Page - Analog Devices |
2 / 32 page ADP1621 Rev. A | Page 2 of 32 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Typical Application Circuit ............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 Thermal Resistance ...................................................................... 5 ESD Caution.................................................................................. 5 Simplified Block Diagram ............................................................... 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 8 Theory of Operation ...................................................................... 12 Control Loop............................................................................... 12 Current-Sense Configurations.................................................. 12 Current Limit .............................................................................. 13 Undervoltage Lockout ............................................................... 13 Shutdown..................................................................................... 13 Soft Start ...................................................................................... 13 Internal Shunt Regulators.......................................................... 13 Setting the Oscillator Frequency and Synchronization Frequency .................................................................................... 13 Application Information: Boost Converter................................. 14 Duty Cycle ................................................................................... 14 Setting the Output Voltage........................................................ 14 Inductor Current Ripple............................................................ 14 Inductor Selection ...................................................................... 14 Input Capacitor Selection.......................................................... 15 Output Capacitor Selection....................................................... 15 Diode Selection........................................................................... 15 MOSFET Selection..................................................................... 16 Loop Compensation .................................................................. 16 Slope Compensation .................................................................. 17 Current Limit .............................................................................. 18 Light Load Operation ................................................................ 18 Recommended Component Manufacturers........................... 19 Layout Considerations................................................................... 20 Efficiency Considerations ............................................................. 21 Examples of Application Circuits................................................. 22 Standard Boost Converter—Design Example ........................ 22 Bootstrapped Boost Converter................................................. 23 SEPIC Converter Circuit ........................................................... 27 Low Voltage Power-Input Circuit ............................................ 27 LED Driver Application Circuits ............................................. 28 Related Parts.................................................................................... 30 Outline Dimensions ....................................................................... 31 Ordering Guide .......................................................................... 31 REVISION HISTORY 12/06—Rev. 0 to Rev. A Changes to Table 1............................................................................ 3 Changes to Table 2............................................................................ 5 Added Table 3.................................................................................... 5 Changes to Table 5.......................................................................... 19 Changes to Ordering Guide .......................................................... 31 7/06—Revision 0: Initial Version |
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