EPR-34 – 12 V, 30 W, Universal Input

10-Feb-2004

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.........................................................................................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

7.6

Transformer Sources.........................................................................................12

8

Transformer Spreadsheets.......................................................................................13

9

Performance Data ....................................................................................................15

9.1

Efficiency ...........................................................................................................15

9.2

No-load Input Power..........................................................................................15

9.3

Regulation .........................................................................................................16

9.3.1

Load ...........................................................................................................16

9.3.2

Line ............................................................................................................16

9.4

Overload Power.................................................................................................17

10

Thermal Performance ...........................................................................................18

11

Waveforms............................................................................................................19

11.1 Drain Voltage and Current, Normal Operation...................................................19

11.2 Output Voltage Start-up Profile..........................................................................19

11.3 Drain Voltage and Current Start-up Profile ........................................................19

11.4 Load Transient Response (75% to 100% Load Step) .......................................20

11.5 Output Ripple Measurements............................................................................21

11.5.1

Ripple Measurement Technique ................................................................21

11.5.2

Measurement Results ................................................................................22

12

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

12.1 115 VAC Maximum Load...................................................................................23

12.2 230 VAC Maximum Load...................................................................................23

13

Conducted EMI .....................................................................................................24

14

AC Surge and 100 kHz Ring Wave Immunity .......................................................25

14.1 Common Mode Surge, 1.2/50 µs.......................................................................25

14.2 Differential Mode Surge, 1.2/50

µs ....................................................................26

14.3 Common Mode, 100 kHz Ring Wave ................................................................26

14.4 Differential Mode, 100 kHz Ring Wave..............................................................26

15

Revision History ....................................................................................................27

Page 2 of 28

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