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List of Figures
1 Demo Board ................................................................................................................. 4
2 LED Current vs. Line Voltage (using TRIAC Dimmer) ................................................................. 4
3 Efficiency vs. Line Voltage................................................................................................. 5
4 Power Factor vs. Line Voltage ............................................................................................ 5
5 LED Current vs. Line Voltage ............................................................................................. 5
6 Output Power vs. Line Voltage............................................................................................ 5
7 SW FET Drain Voltage Waveform (V
IN
= 120V
RMS
, 9 LEDs, I
LED
= 228mA).......................................... 5
8 FLTR2 Waveform (V
IN
= 120V
RMS
, 9 LEDs, I
LED
= 228mA) ............................................................. 5
9 LINE – CISPR/FCC Class B Peak Scan................................................................................. 6
10 NEUTRAL – CISPR/FCC Class B Peak Scan .......................................................................... 6
11 LINE – CISPR/FCC Class B Average Scan............................................................................. 6
12 NEUTRAL – CISPR/FCC Class B Average Scan ...................................................................... 6
13 EN-61000-3 Class C Limits................................................................................................ 6
14 Forward phase circuit at full brightness .................................................................................. 7
15 Forward phase circuit at 90° firing angle................................................................................. 7
16 Forward phase circuit at 150° firing angle ............................................................................... 7
17 Reverse phase circuit at full brightness.................................................................................. 8
18 Reverse phase circuit at 90° firing angle ................................................................................ 8
19 Reverse phase circuit at 150° firing angle ............................................................................... 8
20 Top Side - Thermal Scan .................................................................................................. 9
21 Bottom Side - Thermal Scan............................................................................................. 10
22 Device Pin-Out............................................................................................................. 11
23 Wiring Connection Diagram.............................................................................................. 12
24 Top View.................................................................................................................... 12
25 Bottom View................................................................................................................ 13
26 Evaluation Board Schematic............................................................................................. 14
27 Direct Line-Injection Circuit............................................................................................... 15
28 FLTR2 Waveform with No Dimmer ..................................................................................... 15
29 Typical Operation of FLTR2 Pin ........................................................................................ 16
30 DCM Flyback Current Waveforms ...................................................................................... 17
31 Switch Node Ringing...................................................................................................... 20
32 TVS Diode Clamp ......................................................................................................... 20
33 Bias Supply Circuits....................................................................................................... 21
34 Auxiliary Winding Bias Circuit............................................................................................ 21
35 COFF Current Source Circuit ............................................................................................ 23
36 TRIAC Holding Circuit .................................................................................................... 24
37 OVP Circuit................................................................................................................. 24
38 Input EMI Filter............................................................................................................. 25
39 Inrush Current Spike ...................................................................................................... 26
40 Evaluation Board Schematic............................................................................................. 32
41 Top Layer................................................................................................................... 36
42 Bottom Layer............................................................................................................... 36
List of Tables
1 Pin Description 16 Pin Narrow SOIC ................................................................................... 11
2 Test Points ................................................................................................................. 12
3 Bill of Materials............................................................................................................. 33
2
AN-2090 LM3448 -120VAC, 6W Isolated Flyback LED Driver SNOA554C–October 2011–Revised May 2013
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