10 W, Multiple Output, Isolated Power Supply

05-Dec-2002

Table Of Contents

1

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

2

Power Supply Specification ........................................................................................4

3

Schematic...................................................................................................................5

4

Circuit Description ......................................................................................................6

5

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

6

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

7

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

7.1

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

7.2

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

7.3

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

7.4

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

7.5

Design Notes.....................................................................................................13

7.6

Transformer Sources.........................................................................................13

8

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

9

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

9.1

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

9.2

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

9.2.1

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

9.2.2

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

9.2.3

Cross-Regulation Table..............................................................................19

10

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

11

Waveform Scope Plots .........................................................................................21

12

Load Transient Response (75% to 100% Load Step) ...........................................22

13

Conducted EMI .....................................................................................................23

14

Surge Voltage .......................................................................................................25

14.1 Differential = Line-to-Line (L-N), 2

Ω Source Impedance. .................................25

14.2 Common Mode = Line-to-Ground (L-GND, N-GND), 12

Ω Source Impedance.25

15

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

Important Note:

Although the EP-18 is 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 28

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