EPR-31 Datasheet, PDF (2/36 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-31 Multiple Output 180 W AC-DC Power

EPR-31 – Multi Output, 180 W, PC Main Power Supply
01-Feb-05
Table Of Contents
1 Introduction.................................................................................................... 3
2 Power Supply Specification ........................................................................... 4
3 Schematic...................................................................................................... 5
4 Circuit Description ......................................................................................... 8
5 PCB Layout ................................................................................................. 10
5.1 Assembly Diagram ............................................................................... 10
5.2 Top View .............................................................................................. 12
6 Bill Of Materials ........................................................................................... 14
6.1 Main Board Bill of Materials.................................................................. 14
6.2 Control Board Bill of Materials .............................................................. 16
7 Transformer Specification............................................................................ 17
7.1 180 W Forward Transformer ................................................................ 17
7.1.1 Electrical Diagram ......................................................................... 17
7.1.2 Electrical Specifications................................................................. 17
7.1.3 Materials........................................................................................ 17
7.1.4 Transformer Build Diagram ........................................................... 18
7.1.5 Transformer Construction.............................................................. 18
7.2 10 W PC Standby Transformer ............................................................ 20
7.2.1 Electrical Diagram ......................................................................... 20
7.2.2 Electrical Specifications................................................................. 20
7.2.3 Materials........................................................................................ 20
7.2.4 Transformer Build Diagram ........................................................... 21
7.2.5 Transformer Construction.............................................................. 21
7.3 Output Coupled Inductor ...................................................................... 22
7.3.1 Toroid Layout ................................................................................ 22
7.3.2 Electrical Diagram ......................................................................... 22
7.3.3 Inductances................................................................................... 22
7.4 Mag Amp Inductor ................................................................................ 23
7.4.1 Core Specifications ....................................................................... 23
7.4.2 Winding Instructions ...................................................................... 23
8 Transformer Spreadsheets .......................................................................... 24
9 Performance Data ....................................................................................... 27
9.1 Efficiency and Regulation ..................................................................... 27
10 Thermal Performance .............................................................................. 28
11 Waveforms............................................................................................... 29
12 Output Ripple Measurements .................................................................. 31
12.1 Ripple Measurement Technique........................................................... 31
12.2 Measurement Results .......................................................................... 32
13 Conducted EMI ........................................................................................ 33
14 Revision History ....................................................................................... 34
Important Note:
Although this circuit board has been designed to meet 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.
Power Integrations
Tel: [phone] Fax: [phone]
www.powerint.com
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