DER-37
16W Adapter using TOP245P
April 27, 2004
Table Of Contents
1
2
3
4
Introduction.................................................................................................................4
Power Supply Specification........................................................................................5
Schematic...................................................................................................................6
Circuit Description ......................................................................................................7
4.1
4.2
4.3
Input EMI Filtering...............................................................................................7
Output Rectification.............................................................................................7
Output Feedback.................................................................................................7
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
7.2
7.3
7.4
7.4.1
SHLD Build diagram...................................................................................13
7.5
Transformer Construction..................................................................................14
8
Common Mode Choke .............................................................................................15
8.1
Electrical Diagram .............................................................................................15
Electrical Specifications.....................................................................................15
Materials............................................................................................................15
Common Mode Choke Build Diagram...............................................................16
8.2
8.3
8.4
9
10
Transformer Spreadsheets.......................................................................................17
Performance Data.................................................................................................18
10.1 Efficiency...........................................................................................................18
10.2 No-load Input Power..........................................................................................19
10.3 Regulation.........................................................................................................19
10.3.1 Load...........................................................................................................19
10.3.2 Line ............................................................................................................20
10.4 Over Power Protection ......................................................................................20
10.5 Leakage Current ...............................................................................................20
11
Thermal Performance...........................................................................................21
11.1 Thermal measurements at max ambient...........................................................21
11.2 Thermal margin test ..........................................................................................21
12
Waveforms............................................................................................................22
12.1 Drain Voltage and Current, Normal Operation ..................................................22
12.2 Output Voltage Start-up Profile .........................................................................22
12.3 Drain Voltage and Current Start-up Profile........................................................23
12.4 Load Transient Response (75% to 100% Load Step) .......................................23
12.5 Output Ripple Measurements............................................................................24
12.5.1 Ripple Measurement Technique ................................................................24
12.5.2 Measurement Results ................................................................................25
13
Control Loop Measurements.................................................................................26
13.1 115 VAC Maximum Load ..................................................................................26
13.2 230 VAC Maximum Load ..................................................................................26
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