EPR-33 Datasheet, PDF (2/32 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP 33 - 45 W LCD Monitor External Power Supply using TOP247Y (TOPSwitch-GX)

EPR-33 – 45 W External Adapter Supply
28-Mar-2003
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-GX 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 Specifications............................................................................................... 11
7.2 Materials...................................................................................................................... 11
7.3 Transformer Build Diagram.......................................................................................... 12
7.4 Transformer Construction............................................................................................ 12
7.5 Transformer Sources................................................................................................... 12
8 Transformer Spreadsheet ................................................................................................... 13
9 Performance Data............................................................................................................... 15
9.1 Efficiency..................................................................................................................... 15
9.2 No-load Input Power.................................................................................................... 16
9.3 Input Power at 0.5 W Load .......................................................................................... 16
9.4 Regulation ................................................................................................................... 17
9.4.1 Load .................................................................................................................... 17
9.4.2 Line ..................................................................................................................... 17
10 Thermal Performance...................................................................................................... 18
11 Waveforms...................................................................................................................... 19
11.1 Drain Voltage and Current, Normal Operation ............................................................. 19
11.2 Output Voltage Start-up Profile.................................................................................... 20
11.3 Drain Voltage and Current Start-up Profile .................................................................. 21
11.4 Load Transient Response (75% to 100% Load Step) .................................................. 22
11.5 Output Ripple Measurements ...................................................................................... 23
11.5.1 Ripple Measurement Technique .......................................................................... 23
11.5.2 Measurement Results.......................................................................................... 24
12 Control Loop Measurements ........................................................................................... 25
12.1 115 VAC Maximum Load............................................................................................. 25
12.2 230 VAC Maximum Load............................................................................................. 26
13 Conducted EMI ............................................................................................................... 27
14 AC Surge and 100 kHz Ring Wave Immunity .................................................................. 28
14.1 Common Mode Surge, 1.2/50 µsec................................................................................. 28
14.2 Differential Mode Surge, 1.2/50 µsec........................................................................... 28
14.3 Common Mode, 100 kHz Ring Wave........................................................................... 29
14.4 Differential Mode, 100 kHz Ring Wave ........................................................................ 29
15 Appendix ......................................................................................................................... 30
15.1 Input Cable Bill of Materials ......................................................................................... 30
15.2 Input Cable Assembly.................................................................................................. 30
15.3 Heat Sink Assembly .................................................................................................... 31
16 Revision History .............................................................................................................. 32
Power Integrations, Inc.
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