RDR-257 12 W Non-isolated BUCK LED Driver Using LNK405EG 06-Jan-11
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Power Integrations
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Table of Contents
1 Introduction................................................................................................................. 4
2 Power Supply Specification ........................................................................................ 7
3 Schematic................................................................................................................... 8
4 Circuit Description ...................................................................................................... 9
5 PCB Layout ...............................................................................................................10
6 Bill of Materials ..........................................................................................................11
6.1 Electrical.............................................................................................................11
6.2 Optional OVP Circuit ..........................................................................................11
6.3 Mechanical .........................................................................................................12
7 Heat Sink Assembly ..................................................................................................13
8 Inductor Specification ................................................................................................14
8.1 Electrical Diagram ..............................................................................................14
8.2 Electrical Specifications......................................................................................14
8.3 Materials.............................................................................................................14
8.4 Inductor Build Diagram.......................................................................................14
9 Performance Data .....................................................................................................15
9.1 Efficiency ............................................................................................................15
9.2 Line and Load Regulation...................................................................................16
9.3 Power Factor ......................................................................................................17
9.4 THD....................................................................................................................18
9.5 Harmonics ..........................................................................................................19
9.6 Test Data............................................................................................................21
9.6.1 Test Data, 13 LED Load.............................................................................21
9.6.2 Test Data, 12 LED Load.............................................................................21
9.6.3 Test Data, 11 LED Load.............................................................................21
9.6.4 230 VAC, 50 Hz Harmonics Data, P
IN
= 14.529 W.....................................22
9.6.5 115 VAC, 60 Hz Harmonics Data, P
IN
= 13.96 W.......................................23
10 Waveforms ................................................................................................................24
10.1 Input Line Current...............................................................................................24
10.2 Drain Voltage and Current Normal Operation.....................................................25
10.3 Drain Voltage and Current Start-up Operation ...................................................26
10.4 Output Current, Normal Condition, V
OUT
~ 36 V .................................................27
10.5 Output Current Ripple, V
OUT
~ 36 V....................................................................28
10.6 Output Current and Voltage at Power-up, Power-down .....................................29
10.7 Output Short .......................................................................................................30
10.8 Open Load/LED Condition..................................................................................30
11 Thermal Measurements.............................................................................................31
11.1 Thermal Test Set-up...........................................................................................31
11.2 Thermal Test Results .........................................................................................31
12 Conducted EMI Measurements .................................................................................32
12.1 Conducted EMI Test Set-up ...............................................................................32
12.1.1 Configuration A: Solder Side of Driver Facing Grounded T8 Fixture..........32
12.1.2 Configuration B: Component Side of Driver Facing Grounded T8 Fixture..33
12.2 Conducted EMI Test Results..............................................................................34
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