Datasheet

-50 -25 0 25 50 75 100 125 150
150
160
170
180
190
200
MIN ON-TIME (ns)
TEMPERATURE (°C)
-50 -25 0 25 50 75 100 125 150
200
220
240
260
280
300
BLDR RESISTOR ()
TEMPERATURE (°C)
80 90 100 110 120 130 140
140
160
180
200
220
240
LED CURRENT (mA)
INPUT VOLTAGE (V
RMS
)
8 LEDs
10 LEDs
12 LEDs
80 90 100 110 120 130 140
60
65
70
75
80
85
90
SWITCHING FREQUENCY (kHz)
INPUT VOLTAGE (V
RMS
)
8 LEDs
12 LEDs
10 LEDs
80 90 100 110 120 130 140
74
76
78
80
82
84
EFFICIENCY (%)
INPUT VOLTAGE (V
RMS
)
7 LEDs
9 LEDs
80 90 100 110 120 130 140
0.93
0.94
0.95
0.96
0.97
0.98
POWER FACTOR
INPUT VOLTAGE (V
RMS
)
9 LEDs
7 LEDs
LM3448
SNOSB51C –SEPTEMBER 2011–REVISED MAY 2013 www.ti.com
TYPICAL PERFORMANCE CHARACTERISTICS
T
J
= 25°C and V
CC
= 12V unless otherwise specified.
Efficiency vs. Input Line Voltage
(1)
Power Factor vs. Input Line Voltage
(1)
Figure 3. Figure 4.
LED Current vs. Input Line Voltage
(2)
f
SW
vs. Input Line Voltage
(2)
Figure 5. Figure 6.
Min On-Time (t
ON
) vs. Temperature BLDR Resistor vs. Temperature
Figure 7. Figure 8.
(1) Data used for this plot taken from Design #3.
(2) Data used for this plot taken from Design #2.
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