DPA422-426
Section List
Functional Block Diagram
....................................................................................................................................... 3
Pin Functional Description
...................................................................................................................................... 3
DPA-Switch Family Functional Description
............................................................................................................ 4
CONTROL (C) Pin Operation .................................................................................................................................... 4
Oscillator and Switching Frequency.......................................................................................................................... 5
Pulse Width Modulator & Maximum Duty Cycle ........................................................................................................ 5
Minimum Duty Cycle and Cycle Skipping ................................................................................................................. 6
Error Amplifier .......................................................................................................................................................... 6
On-chip Current Limit with External Programmability ................................................................................................ 6
Line Undervoltage Detection (UV) ............................................................................................................................. 6
Line Overvoltage Shutdown (OV) .............................................................................................................................. 6
Line Feed-Forward with DC
MAX
Reduction ................................................................................................................ 6
Remote ON/OFF ...................................................................................................................................................... 7
Synchronization........................................................................................................................................................ 7
Soft-Start ................................................................................................................................................................. 8
Shutdown/Auto-Restart ........................................................................................................................................... 8
Hysteretic Over-Temperature Protection ................................................................................................................... 8
Bandgap Reference ................................................................................................................................................. 8
High-Voltage Bias Current Source ............................................................................................................................ 8
Using Feature Pins
..................................................................................................................................................... 8
FREQUENCY (F) Pin Operation ................................................................................................................................ 8
LINE-SENSE (L) Pin Operation ................................................................................................................................. 9
EXTERNAL CURRENT LIMIT (X) Pin Operation ......................................................................................................... 9
Typical Uses of FREQUENCY (F) Pin
...................................................................................................................... 11
Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins
....................................................... 11
Application Examples
.............................................................................................................................................. 14
Key Application Considerations
.............................................................................................................................. 16
DPA-Switch Design Considerations ........................................................................................................................ 16
DPA-Switch Layout Considerations ........................................................................................................................ 18
Quick Design Checklist .......................................................................................................................................... 19
Design Tools .......................................................................................................................................................... 20
Product Specifications and Test Conditions
.......................................................................................................... 21
Typical Performance Characteristics
.................................................................................................................. 27
Part Ordering Information
....................................................................................................................................... 30
Package Outlines
.................................................................................................................................................... 31
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Rev. T 12/12
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