DPA426 データシートの表示（PDF） - Power Integrations, Inc

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DPA426

Highly Integrated DC-DC Converter ICs for Power over Ethernet & Telecom Applications

Power Integrations, Inc 

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 DCMAX 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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