DER-96

10 W VoIP

September 12, 2005

Page 2 of 33

CONFIDENTIAL

Power Integrations

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

www.powerint.com

Table Of Contents

1

Introduction................................................................................................................. 4

2

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

3

Schematic................................................................................................................... 6

4

Circuit Operation ........................................................................................................ 7

4.1

General ............................................................................................................... 7

4.2

Description .......................................................................................................... 7

5

BOM ........................................................................... Error! Bookmark not defined.

6

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

7

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

8

Transformer Specification......................................................................................... 14

8.1

Transformer Winding......................................................................................... 14

8.2

Electrical Specifications..................................................................................... 14

8.3

Materials............................................................................................................ 14

8.4

Transformer Build Diagram ............................................................................... 15

8.5

Transformer Construction.................................................................................. 15

8.5.1

WD#3 Copper Foil build diagram: .............................................................. 16

9

Inductor Specification ............................................................................................... 17

9.1

Inductor Winding ............................................................................................... 17

9.2

Electrical Specifications..................................................................................... 17

9.3

Materials............................................................................................................ 17

9.4

Inductor Footprint Diagram................................................................................ 18

9.5

Inductor Construction ........................................................................................ 18

10

Performance ......................................................................................................... 19

10.1

Efficiency........................................................................................................... 19

10.2

Regulation vs. Load........................................................................................... 20

10.3

Regulation vs. Load........................................................................................... 21

10.4

Raw Performance Data ..................................................................................... 22

10.5

Thermal Performance........................................................................................ 24

11

Waveforms............................................................................................................ 25

11.1

Drain Current and Voltage................................................................................. 25

11.2

Output Transient Load Response ..................................................................... 26

11.3

Output Ripple Voltage ....................................................................................... 27

11.4

Output Voltage Start-up Profile ......................................................................... 28

12

Conducted EMI ..................................................................................................... 30

12.1

230V High Line EMI .......................................................................................... 30

13

Radiated EMI scans.............................................................................................. 31

14

Revision History .................................................................................................... 32