DER-120
22 W Triple Output Flyback – DPA424R
October 26, 2005
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
PCB Layout............................................................................................................................8
Bill Of Materials......................................................................................................................9
6.1
Triple Output Flyback Converter.....................................................................................9
7
Transformer Specification....................................................................................................10
7.1
Electrical Specifications................................................................................................10
Materials.......................................................................................................................10
Transformer Build Diagram...........................................................................................11
Transformer Construction.............................................................................................11
7.2
7.3
7.4
8
9
Transformer Spreadsheets ..................................................................................................12
Performance Data................................................................................................................13
9.1
9.2
9.2.1
9.2.2
Cross Regulation Matrix ...............................................................................................13
Regulation ....................................................................................................................14
LINE ......................................................................................................................14
LOAD.....................................................................................................................15
10
Waveforms.......................................................................................................................16
10.1 Drain Voltage, Normal Operation..................................................................................16
10.2 Output Voltage Start-up Profile.....................................................................................17
10.3 Load Transient Response (0.75 A to 2 A Load Step) ...................................................18
10.4 Output Ripple Measurements.......................................................................................19
10.4.1 Ripple Measurement Technique............................................................................19
10.4.2 Measurement Results at 48 VDC..........................................................................20
11
Control Loop Measurements............................................................................................21
11.1 Maximum Load.............................................................................................................21
11.2 Minimum Load..............................................................................................................22
12
Revision History ...............................................................................................................24
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