EPR-16 Datasheet, PDF (2/36 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-16 2.75 W Charger/Adapter Using LNK501

EPR-16 - LinkSwitch 2.75 W Charger/Adapter
17-May-04
Table Of Contents
1 Introduction.................................................................................................................4
2 Power Supply Specification ........................................................................................5
3 Schematic...................................................................................................................7
4 Circuit Description ......................................................................................................8
4.1 Input Stage ..........................................................................................................8
4.2 LinkSwitch Operation ..........................................................................................9
4.3 Transformer.......................................................................................................10
4.4 Clamp and Feedback Components ...................................................................10
4.5 Output Stage .....................................................................................................11
5 PCB Layout ..............................................................................................................12
6 Bill Of Materials ........................................................................................................13
7 Transformer ..............................................................................................................14
7.1 Transformer Winding .........................................................................................14
7.2 Electrical Specifications.....................................................................................14
7.3 Materials............................................................................................................15
7.4 Transformer Build Diagram ...............................................................................15
7.5 Transformer Construction..................................................................................16
8 Performance Data ....................................................................................................17
8.1 Line and Load Regulation..................................................................................17
8.2 Efficiency ...........................................................................................................18
8.3 No-Load Input Power ........................................................................................18
9 Waveforms ...............................................................................................................19
9.1 Drain Voltage and Current Waveforms..............................................................19
9.1.1 90 VAC, Normal Operation.........................................................................19
9.1.2 265 VAC, Normal Operation.......................................................................19
9.2 Output Voltage Start-up Profile..........................................................................20
9.3 Load Transient Response (0.25 A to 0.5 A Load Step) .....................................20
9.4 Output Ripple Measurements............................................................................21
9.4.1 Ripple Measurement Technique ................................................................21
9.4.2 Output Voltage Ripple ................................................................................22
9.5 Thermal Measurements ....................................................................................23
9.6 Conducted EMI..................................................................................................24
9.6.1 Optional Components With Artificial Hand .................................................25
9.6.2 Optional Components Without Artificial Hand ............................................25
9.6.3 Optional Components Removed With Artificial Hand .................................26
10 Appendix A – EP-16 Enclosure Opening Procedures ..............................................27
10.1 Method 1 - Non-destructive ...............................................................................27
10.2 Method 2 - Destructive ......................................................................................27
11 Appendix B – LNK520P in the High-Side Configuration ..........................................28
11.1 Introduction........................................................................................................28
11.2 Comparison of LNK501 and LNK520 ................................................................28
11.3 Circuit Changes.................................................................................................29
11.4 Performance Data .............................................................................................30
11.4.1 Line and Load Regulation ..........................................................................30
11.4.2 Efficiency....................................................................................................31
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