EPR-54 – LinkSwitch 2.75 W Low Cost Charger / Adapter
07-May-2004
Table Of Contents
1
2
3
4
Introduction.................................................................................................................4
Power Supply Specification ........................................................................................5
Schematic...................................................................................................................6
Circuit Description ......................................................................................................7
4.1
Input EMI Filtering ...............................................................................................7
LinkSwitch Primary and Output Feedback...........................................................7
Output Rectification.............................................................................................9
4.2
4.3
5
6
7
PCB Layout ................................................................................................................9
Bill Of Materials ........................................................................................................10
Transformer Specification.........................................................................................11
7.1
Electrical Diagram .............................................................................................11
Electrical Specifications.....................................................................................11
Materials............................................................................................................12
Transformer Build Diagram ...............................................................................13
Transformer Construction..................................................................................15
Transformer Bobbing Drawing...........................................................................16
7.2
7.3
7.4
7.5
7.6
8
9
Performance Data ....................................................................................................17
8.1
Efficiency...........................................................................................................17
No-load Input Power..........................................................................................18
Regulation .........................................................................................................19
8.2
8.3
8.3.1
Line and Load ............................................................................................19
8.4
Thermal Performance........................................................................................20
Waveforms ...............................................................................................................22
9.1
Drain Voltage and Current, Normal Operation...................................................22
Output Voltage Start-up Profile (Battery Load)..................................................22
Drain Voltage and Current Start-up Profile........................................................23
Load Transient Response (75% to 100% Load Step) .......................................24
Output Ripple Measurements............................................................................25
9.2
9.3
9.4
9.5
9.5.1
9.5.2
Ripple Measurement Technique ................................................................25
Ripple Measurement Results .....................................................................26
10
11
Conducted EMI .....................................................................................................27
Appendix A: EE16 Simple Construction................................................................29
11.1 Introduction........................................................................................................29
11.2 Schematic..........................................................................................................29
11.3 Bill of Materials..................................................................................................29
11.4 Transformer Specification..................................................................................31
11.4.1 Transformer Winding..................................................................................31
11.4.2 Electrical Specifications..............................................................................31
11.4.3 Transformer Build Diagram ........................................................................32
11.5 Performance Data .............................................................................................32
11.5.1 Efficiency....................................................................................................33
11.5.2 Line and Load Regulation ..........................................................................34
11.6 Conducted EMI..................................................................................................34
12
Revision History ................................................................................................36
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