DER-112

20 W / 30 W Constant Current LED Backlight Driver

July 19, 2006

Page 2 of 17

Power Integrations

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Table Of Contents

1

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

2

Power Supply Specification ........................................................................................6

2.1

Board 1 (40 V Output)..........................................................................................6

2.2

Board 2 (60 V Output)..........................................................................................6

3

Schematic ...................................................................................................................7

3.1

Schematic of Board 1 (40 V Output) ....................................................................7

3.2

Schematic of Board 2 (60 V Output) ....................................................................8

4

BOM............................................................................................................................9

4.1

Bill of Materials – Board 1 (40 V) .........................................................................9

4.2

Bill of Materials – Board 2 (60 V) .......................................................................10

5

Layout .......................................................................................................................11

6

Performance .............................................................................................................12

6.1

Efficiency ...........................................................................................................12

6.2

Regulation vs. Load (40 V) ................................................................................13

6.3

Regulation vs. Load (60 V) ................................................................................14

7

Performance .............................................................................................................15

7.1

Raw Performance Data – 60V Board.................................................................15

7.2

Raw Performance Data – 40 V Board................................................................15

8

Revision History ........................................................................................................16

Important Note:

This board is designed to be non-isolated. However the outputs are high voltage so

please take the necessary safety precautions.

Design Reports contain a power supply design specification, schematic, bill of materials,

and transformer documentation. Performance data and typical operation characteristics

are included. Typically only a single prototype has been built.