DER-53

105C Dual Output Cook top Power Supply

April 20, 2005

Page 2 of 27

Power Integrations

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Table Of Contents

1

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

2

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

3

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

4

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

4.1

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

4.2

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

4.3

Output Rectification ............................................................................................. 7

4.4

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

5

PCB Layout ................................................................................................................ 9

6

Bill Of Materials ........................................................................................................ 10

7

Transformer Specification......................................................................................... 12

7.1

Electrical Diagram ............................................................................................. 12

7.2

Electrical Specifications..................................................................................... 12

7.3

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

7.4

Transformer Build Diagram ............................................................................... 13

7.5

Transformer Construction.................................................................................. 13

7.6

Bobbin Drawing ................................................................................................. 14

7.7

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

8

Performance Data .................................................................................................... 17

8.1

Efficiency........................................................................................................... 17

8.2

Minimum Load Input Power............................................................................... 17

8.3

Regulation ......................................................................................................... 18

8.3.1

Load ........................................................................................................... 18

8.3.2

Line ............................................................................................................ 18

9

Thermal Performance............................................................................................... 19

10

Waveforms............................................................................................................ 20

10.1

Drain Voltage and Current, Normal Operation .................................................. 20

10.2

Output Voltage Start-up Profile ......................................................................... 20

10.3

Drain Voltage and Current Start-up Profile........................................................ 21

10.4

Load Transient Response (75% to 100% Load Step) ....................................... 21

10.5

Output Ripple Measurements............................................................................ 22

10.5.1

Ripple Measurement Technique ................................................................ 22

10.5.2

Measurement Results ................................................................................ 23

11

Control Loop Measurements................................................................................. 24

11.1

85 VAC Input..................................................................................................... 24

11.2

265 VAC Input................................................................................................... 24

12

Conducted EMI ..................................................................................................... 25

13

Revision History .................................................................................................... 26