LM3444_15 Datasheet, PDF (6/27 Pages) Texas Instruments – AC-DC Offline LED Driver

LM3444
SNVS682D – NOVEMBER 2010 – REVISED DECEMBER 2015
6.6 Typical Characteristics
300k
250k
7 LEDs in Series (V_O = 24.5V)
200k
150k
100k
50k
0
80
C11 = 2.2 nF, R3 = 348 k:
90 100 110 120 130 140
LINE VOLTAGE (V_AC)
Figure 1. f_SW vs Input Line Voltage
8.0
UVLO (V_CC) Rising
7.5
7.0
UVLO (V_CC) Falling
6.5
6.0
-50 -25 0 25 50 75 100 125 150
TEMPERATURE (°C)
Figure 3. V_CC UVLO vs Temperature
1.29
1.28
1.27
OFF Threshold at C11
1.26
1.25
-50 -30 -10 10 30 50 70 90 110130150
TEMPERATURE (°C)
Figure 5. Off Threshold (C11) vs Temperature
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95.0
14 Series connected LEDs
90.0
85.0
10 Series connected LEDs
80.0
75.0
80
90 100 110 120 130 140
LINE VOLTAGE (V_AC)
Figure 2. Efficiency vs Input Line Voltage
200.0
190.0
180.0
170.0
160.0
150.0
-50 -25 0 25 50 75 100 125 150
TEMPERATURE (°C)
Figure 4. Minimum On-Time (t_ON) vs Temperature
1.50
Series
connected LEDs
1.25
3 LEDs
1.00
5 LEDs
0.75
7 LEDs
0.50
9 LEDs
0.25
0
50
100
150
200
V_BUCK (V)
Figure 6. Normalized Variation in f_SW Over V_BUCK Voltage
6
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