04-Oct-2005
EP-85 6 V, 330 mA Low Cost Charger
Table of Contents
1
2
3
4
Introduction.................................................................................................................4
Power Supply Specification ........................................................................................6
Schematic...................................................................................................................7
Circuit Description.......................................................................................................7
4.1
Input and EMI Filtering.........................................................................................7
LinkSwitch-LP Feedback .....................................................................................7
Primary Clamp and Transformer Construction ....................................................8
Output Rectification and Filtering.........................................................................8
Optional Components..........................................................................................8
4.2
4.3
4.4
4.5
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................................................................................12
Design Spreadsheet ..........................................................................................14
7.2
7.3
7.4
7.5
8
Performance Data.....................................................................................................16
8.1 Efficiency ...........................................................................................................16
8.1.1
8.2
8.3
Active Mode CEC Measurement Data........................................................16
No-Load Input Power.........................................................................................17
Regulation .........................................................................................................17
9
10
Thermal Performance ...............................................................................................18
Waveforms............................................................................................................20
10.1 Drain Voltage and Current, Normal Operation...................................................20
10.2 Output Voltage Start-Up Profile, Battery Load...................................................21
10.3 Drain Voltage and Current Start-Up Profile........................................................22
10.4 Output Ripple Measurements............................................................................23
10.4.1 Ripple Measurement Technique.................................................................23
10.4.2 Measurement Results.................................................................................24
11
12
13
Conducted EMI .....................................................................................................25
AC Line Surge.......................................................................................................27
Revision History ....................................................................................................28
Important Note:
Although this board is designed to satisfy 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.
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