EPR-16 - LinkSwitch 2.75 W Charger/Adapter
17-May-04
Table Of Contents
1
2
3
4
Introduction.................................................................................................................4
Power Supply Specification ........................................................................................5
Schematic...................................................................................................................7
Circuit Description ......................................................................................................8
4.1
Input Stage..........................................................................................................8
LinkSwitch Operation ..........................................................................................9
Transformer.......................................................................................................10
Clamp and Feedback Components...................................................................10
Output Stage .....................................................................................................11
4.2
4.3
4.4
4.5
5
6
7
PCB Layout ..............................................................................................................12
Bill Of Materials ........................................................................................................13
Transformer..............................................................................................................14
7.1
Transformer Winding.........................................................................................14
Electrical Specifications.....................................................................................14
Materials............................................................................................................15
Transformer Build Diagram ...............................................................................15
Transformer Construction..................................................................................16
7.2
7.3
7.4
7.5
8
9
Performance Data ....................................................................................................17
8.1
Line and Load Regulation..................................................................................17
Efficiency...........................................................................................................18
No-Load Input Power ........................................................................................18
8.2
8.3
Waveforms ...............................................................................................................19
9.1
9.1.1
9.1.2
Drain Voltage and Current Waveforms..............................................................19
90 VAC, Normal Operation.........................................................................19
265 VAC, Normal Operation.......................................................................19
9.2
9.3
9.4
Output Voltage Start-up Profile..........................................................................20
Load Transient Response (0.25 A to 0.5 A Load Step).....................................20
Output Ripple Measurements............................................................................21
9.4.1
Ripple Measurement Technique ................................................................21
Output Voltage Ripple ................................................................................22
Thermal Measurements ....................................................................................23
Conducted EMI..................................................................................................24
9.4.2
9.5
9.6
9.6.1
9.6.2
9.6.3
Optional Components With Artificial Hand .................................................25
Optional Components Without Artificial Hand ............................................25
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
Power Integrations
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