EPR-34 Datasheet, PDF (2/28 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 34 - Single Output 30 W AC-DC Power Supply

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
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