© 2012 Fairchild Semiconductor Corporation

2

FEBFL7730_L20L008B • Rev.1.1.1

Table of Contents

1. Introduction............................................................................................................................... 3

1.1.

General Description........................................................................................................ 3

1.2.

Features .......................................................................................................................... 3

1.3.

Internal Block Diagram.................................................................................................. 4

2. General Specifications .............................................................................................................. 5

3. Photographs............................................................................................................................... 6

4. Printed Circuit Board ................................................................................................................ 7

5. Schematic.................................................................................................................................. 8

6. Bill of Materials ........................................................................................................................ 9

7. Transformer and Winding Specifications ............................................................................... 11

8. Performance of Evaluation Board........................................................................................... 12

8.1.

Startup .......................................................................................................................... 12

8.2.

Operation Waveforms .................................................................................................. 12

8.3.

Constant Current Regulation........................................................................................ 13

8.4.

Open/Short-LED Protections ....................................................................................... 14

8.5.

Dimming Operation...................................................................................................... 15

8.6.

System Efficiency ........................................................................................................ 18

8.7.

Power Factor and Total Harmonic Distortion .............................................................. 19

8.8.

Operating Temperature ................................................................................................ 21

8.9.

Electromagnetic Interference (EMI) ............................................................................ 22

9. Revision History ..................................................................................................................... 23