DER-40

DVD/RW HDD PSU using TOP246Y

February 22, 2005

Page 2 of 30

Power Integrations

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

www.powerint.com

Table Of Contents

1

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

2

Photograph.................................................................................................................... 4

3

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

4

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

5

Circuit Description ......................................................................................................... 8

5.1

Input EMI Filtering .................................................................................................. 8

5.2

TOPSwitch Primary................................................................................................ 8

5.3

Outputs................................................................................................................... 8

5.4

Output Feedback.................................................................................................... 8

5.5

Rev 2 to Rev3 changes .......................................................................................... 9

6

PCB Layout ................................................................................................................. 10

7

Bill Of Materials ........................................................................................................... 11

8

Transformer Specification ........................................................................................... 13

8.1

Electrical Diagram ................................................................................................ 13

8.2

Electrical Specifications ....................................................................................... 13

8.3

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

8.4

Transformer Build Diagram .................................................................................. 14

8.4.1

WD#3 Copper Foil build diagram: ................................................................. 15

8.4.2

WDG#4 & #5 Copper Foil build diagram: ...................................................... 15

8.5

Transformer Construction..................................................................................... 16

8.6

Transformer Spreadsheets................................................................................... 17

9

Performance Data ....................................................................................................... 20

9.1

Regulation in DVD Recording Mode .................................................................... 20

9.2

Efficiency.............................................................................................................. 20

9.3

Standby Input Power ............................................................................................ 21

9.4

Peak Load Margin ................................................................................................ 21

10

Thermal Performance .............................................................................................. 22

11

Control Loop Measurements.................................................................................... 23

11.1

110 VAC Maximum Continuous Load .................................................................. 23

11.2

230 VAC Maximum Continuous Load .................................................................. 23

12

Waveforms............................................................................................................... 24

12.1

Drain Voltage Normal Operation .......................................................................... 24

12.2

Output Voltage Start-up Profile ............................................................................ 24

12.3

Drain Voltage Start-up Profile............................................................................... 26

13

Conducted EMI ........................................................................................................ 27

13.1

230V High Line EMI ............................................................................................. 27

13.2

110V Low Line EMI .............................................................................................. 28

14

Revision History....................................................................................................... 29