User manual

80 90 100 110 120 130 140
50
100
150
200
250
300
350
LED CURRENT (mA)
INPUT VOLTAGE (V
RMS
)
12 LEDs
10 LEDs
8 LEDs
80 90 100 110 120 130 140
4
5
6
7
8
P
OUT
(W)
INPUT VOLTAGE V
RMS
12 LEDs
10 LEDs
8 LEDs
80 90 100 110 120 130 140
74
76
78
80
82
84
EFFICIENCY (%)
INPUT VOLTAGE (V
RMS
)
12 LEDs
10 LEDs
8 LEDs
80 90 100 110 120 130 140
0.78
0.80
0.82
0.84
0.86
0.88
0.90
POWER FACTOR
INPUT VOLTAGE V
RMS
12 LEDs
10 LEDs
8 LEDs
www.ti.com Typical Performance Characteristics
5 Typical Performance Characteristics
T
J
=25°C and V
CC
=12V, unless otherwise specified.
Figure 3. Efficiency vs. Line Voltage Figure 4. Power Factor vs. Line Voltage
Figure 5. LED Current vs. Line Voltage Figure 6. Output Power vs. Line Voltage
Figure 7. SW FET Drain Voltage Waveform Figure 8. COFF Voltage (CH1), Inductor Current (CH4)
(V
IN
=120V
RMS
, 12 LEDs, I
LED
=181mA) (V
IN
=120V
RMS
, 12 LEDs, I
LED
=181mA)
3
SNOA559B–October 2011–Revised May 2013 AN-2127 LM3448 A19 Edison Retrofit Evaluation Board
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