DPA423-426
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 ..................................................................................................... 6
Minimum Duty Cycle and Cycle Skipping ............................................................................................................... 6
Error Amplifier ......................................................................................................................................................... 6
On-chip Current Limit with External Programmability ............................................................................................. 6
Line Under-Voltage Detection (UV) ........................................................................................................................ 6
Line Overvoltage Shutdown (OV) ........................................................................................................................... 7
Line Feed Forward with DCMAX Reduction .............................................................................................................. 7
Remote ON/OFF .................................................................................................................................................... 7
Synchronization ...................................................................................................................................................... 8
Soft-Start ................................................................................................................................................................ 8
Shutdown/Auto-Restart .......................................................................................................................................... 8
Hysteretic Over-Temperature Protection ................................................................................................................ 8
Bandgap Reference................................................................................................................................................ 8
High-Voltage Bias Current Source.......................................................................................................................... 8
Using Feature Pins...................................................................................................................................................... 9
FREQUENCY (F) Pin Operation............................................................................................................................. 9
LINE-SENSE (L) Pin Operation .............................................................................................................................. 9
EXTERNAL CURRENT LIMIT (X) Pin Operation ................................................................................................... 9
Typical Uses of FREQUENCY (F) Pin ...................................................................................................................... 12
Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins....................................................... 12
Application Examples ............................................................................................................................................... 15
Key Application Considerations .............................................................................................................................. 17
DPA-Switch Design Considerations...................................................................................................................... 17
DPA-Switch Layout Considerations ...................................................................................................................... 18
Quick Design Checklist......................................................................................................................................... 19
Design Tools ......................................................................................................................................................... 19
Product Specifications and Test Conditions .......................................................................................................... 21
Typical Performance Characteristics ..................................................................................................................... 27
Part Ordering Information ........................................................................................................................................ 31
Package Outlines ...................................................................................................................................................... 32
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