EP-89 6.2 V, 322 mA Adapter

08-Nov-2005

Table Of Contents

1

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

2

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

3

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

4

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

4.1

Input Filter ...........................................................................................................7

4.2

LNK362 Primary ..................................................................................................7

4.3

Feedback.............................................................................................................8

5

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

6

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

7

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

7.1

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

7.2

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

7.3

Materials............................................................................................................11

7.4

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

7.5

Transformer Construction..................................................................................12

8

Design Spreadsheets ...............................................................................................13

9

Performance Data ....................................................................................................16

9.1

Efficiency ...........................................................................................................16

9.1.1

Active Mode Efficiency (CEC) Measurement Data.....................................16

9.2

No-load Input Power..........................................................................................17

9.3

Available Standby Output Power.......................................................................18

9.4

Regulation .........................................................................................................19

9.4.1

Load ...........................................................................................................19

9.4.2

Line ............................................................................................................20

10

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

11

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

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

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

11.3 Drain Voltage and Current Start-up Profile ........................................................23

11.4 Load Transient Response (75% to 100% Load Step) .......................................23

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

11.5.1

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

11.5.2

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

12

Line Surge.............................................................................................................26

13

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

14

Revision History ....................................................................................................28

Important Note:

Although this board has been designed to satisfy safety isolation requirements, the

engineering prototype has not been agency approved. Therefore, all testing should be

performed using an isolation transformer to provide the AC input to the prototype board.

Page 2 of 32

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