RDR-131 LED Driver – LNK306DN

7-Mar-07

Page 2 of 24

Power Integrations, Inc.

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

Table of Contents

1

Introduction...............................................................................................................3

2

Power Supply Specification ......................................................................................5

3

Circuit Diagram.........................................................................................................6

4

Circuit Description ....................................................................................................7

4.1

Configuration and Assembly Details..................................................................7

4.2

AC Input Rectification........................................................................................7

4.3

LinkSwitch-TN ...................................................................................................7

4.4

Output Feedback...............................................................................................7

5

Bill of Materials .......................................................................................................10

5.1

Filter Board Bill of Materials.............................................................................10

5.2

Converter Board Bill of Materials.....................................................................11

6

PI Xls

Design Spreadsheet.....................................................................................12

7

Performance ...........................................................................................................14

7.1

Efficiency .........................................................................................................14

7.2

Output Current Regulation Vs. Line Voltage....................................................15

7.3

Output VI Characteristic ..................................................................................15

8

Waveforms .............................................................................................................16

8.1

Drain Voltage and Current, Normal Operation.................................................16

8.2

Output Current and Voltage.............................................................................16

8.3

Drain Current and Bulk Capacitor Voltage.......................................................17

8.4

Startup Drain Current and Bulk Capacitor Voltage ..........................................17

8.5

Startup Output Voltage and Current ................................................................18

8.6

Fault Conditions ..............................................................................................18

9

Thermal Measurements..........................................................................................19

10 Conducted EMI.......................................................................................................20

10.1 Competitive Product EMI.................................................................................21

11 Revision History......................................................................................................22

Important Note:

This board has no safety isolation. Therefore, all testing should be performed using an

isolation transformer to provide the AC input to the prototype board.