DER-98

41W (53W pk) DVR

September 12, 2005

Page 2 of 30

Power Integrations

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Table Of Contents

1

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

2

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

3

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

4

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

5

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

5.1

Input EMI Filtering .................................................................................................. 7

5.2

TOPSwitch Primary................................................................................................ 7

5.3

Outputs................................................................................................................... 7

5.4

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

5.5

Output OV Protection ............................................................................................. 7

6

PCB Layout ................................................................................................................... 8

7

Bill Of Materials ............................................................................................................. 9

8

Transformer Specification ........................................................................................... 11

8.1

Electrical Diagram ................................................................................................ 11

8.2

Electrical Specifications ....................................................................................... 11

8.3

Materials............................................................................................................... 12

8.4

Transformer Build Diagram .................................................................................. 12

8.4.1

WD#3 Copper Foil build diagram: ................................................................. 13

8.4.2

WDG#4 & #5 Copper Foil build diagram: ...................................................... 13

8.5

Transformer Construction..................................................................................... 14

8.6

Transformer Spreadsheets................................................................................... 15

9

Performance Data ....................................................................................................... 18

9.1

Line and Load Regulation .................................................................................... 18

9.2

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

9.3

Overvoltage Protection......................................................................................... 19

10

Thermal Performance .............................................................................................. 20

11

Control Loop Measurements.................................................................................... 21

11.1

110 VAC Maximum Continuous Load .................................................................. 21

11.2

230 VAC Maximum Continuous Load .................................................................. 21

12

Waveforms............................................................................................................... 22

12.1

Drain Voltage and Current, Normal Operation ..................................................... 22

12.2

Output Voltage Start-up Profile ............................................................................ 22

12.3

Drain Voltage Start-up Profile............................................................................... 23

13

Output Ripple Measurements .................................................................................. 24

13.1.1

Ripple Measurement Technique ................................................................... 24

13.1.2

Measurement Results ................................................................................... 25

14

Conducted EMI ........................................................................................................ 28

14.1

230V High Line EMI ............................................................................................. 28

15

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