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AN4165 Datasheet(PDF) 2 Page - STMicroelectronics

Part # AN4165
Description  This document describes a 12 V - 1 A power supply set in non-isolated flyback topology
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4165 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
AN4165
2/37
Doc ID 023661 Rev 1
Contents
1
Adapter features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3
Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4
Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5
Testing the board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1
Typical waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6
Line/load regulation and output voltage ripple . . . . . . . . . . . . . . . . . . 13
7
Burst mode and output voltage ripple . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8
Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9
Light-load performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
10
Functional check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
10.1
Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
10.2
Overload protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
10.3
Feedback loop failure protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
11
Feedback loop calculation guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . 24
11.1
Transfer function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
11.2
Compensation procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
12
Thermal measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
13
EMI measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
14
Board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
15
Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31


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