DER-98
41W (53W pk) DVR
September 12, 2005
Table Of Contents
1
2
3
4
5
Introduction ...................................................................................................................4
Photograph....................................................................................................................4
Power Supply Specification...........................................................................................5
Schematic .....................................................................................................................6
Circuit Description .........................................................................................................7
5.1
Input EMI Filtering..................................................................................................7
TOPSwitch Primary................................................................................................7
Outputs...................................................................................................................7
Output Feedback....................................................................................................7
Output OV Protection.............................................................................................7
5.2
5.3
5.4
5.5
6
7
8
PCB Layout...................................................................................................................8
Bill Of Materials .............................................................................................................9
Transformer Specification ...........................................................................................11
8.1
Electrical Diagram................................................................................................11
Electrical Specifications .......................................................................................11
Materials...............................................................................................................12
Transformer Build Diagram ..................................................................................12
8.2
8.3
8.4
8.4.1
8.4.2
8.5
8.6
WD#3 Copper Foil build diagram:.................................................................13
WDG#4 & #5 Copper Foil build diagram:......................................................13
Transformer Construction.....................................................................................14
Transformer Spreadsheets...................................................................................15
9
Performance Data .......................................................................................................18
9.1
9.2
9.3
Line and Load Regulation ....................................................................................18
Efficiency..............................................................................................................19
Overvoltage Protection.........................................................................................19
Thermal Performance..............................................................................................20
Control Loop Measurements....................................................................................21
10
11
11.1 110 VAC Maximum Continuous Load ..................................................................21
11.2 230 VAC Maximum Continuous Load ..................................................................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 Start-up Profile...............................................................................23
13
Output Ripple Measurements..................................................................................24
13.1.1 Ripple Measurement Technique ...................................................................24
13.1.2 Measurement Results...................................................................................25
Conducted EMI........................................................................................................28
14
14.1 230V High Line EMI .............................................................................................28
15
Revision History.......................................................................................................29
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