DPA426 Power Integrations, DPA426 Datasheet - Page 2

• Manufacturer Part Number: DPA426
• Description: (DPA423 - DPA426) Highly Integrated DC-DC Converter ICs for Distributed Power Architectures
• Manufacturer: Power Integrations

Functional Block Diagram ......................................................................................................................................... 3
Pin Functional Description ........................................................................................................................................ 3
DPA-Switch Family Functional Description .............................................................................................................. 4
Using Feature Pins ...................................................................................................................................................... 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
Product Specifications and Test Conditions .......................................................................................................... 21
Typical Performance Characteristics ..................................................................................................................... 27
Part Ordering Information ........................................................................................................................................ 31
Package Outlines ...................................................................................................................................................... 32
2
DPA423-426
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 DC
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
FREQUENCY (F) Pin Operation ............................................................................................................................. 9
LINE-SENSE (L) Pin Operation .............................................................................................................................. 9
EXTERNAL CURRENT LIMIT (X) Pin Operation ................................................................................................... 9
DPA-Switch Design Considerations ...................................................................................................................... 17
DPA-Switch Layout Considerations ...................................................................................................................... 18
Quick Design Checklist ......................................................................................................................................... 19
Design Tools ......................................................................................................................................................... 19
K
1/04
MAX
Reduction .............................................................................................................. 7
Section List