LM3444MM Datasheet, PDF (5/30 Pages) Texas Instruments – AC-DC Offline LED Driver

LM3444
www.ti.com
SNVS682C – NOVEMBER 2010 – REVISED MAY 2013
TYPICAL PERFORMANCE CHARACTERISTICS
300k
f_SW vs Input Line Voltage
250k
7 LEDs in Series (V_O = 24.5V)
200k
Efficiency vs Input Line Voltage
95.0
14 Series connected LEDs
90.0
150k
85.0
100k
50k
0
80
C11 = 2.2 nF, R3 = 348 k:
90 100 110 120 130 140
LINE VOLTAGE (V_AC)
Figure 3.
V UVLO_CC vs Temperature
8.0
UVLO (V_CC) Rising
7.5
7.0
UVLO (V_CC) Falling
6.5
10 Series connected LEDs
80.0
75.0
80
90 100 110 120 130 140
LINE VOLTAGE (V_AC)
Figure 4.
Min On-Time (t_ON) vs Temperature
200.0
190.0
180.0
170.0
160.0
6.0
-50 -25 0 25 50 75 100 125 150
TEMPERATURE (°C)
Figure 5.
Off Threshold (C11) 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 7.
150.0
-50 -25 0 25 50 75 100 125 150
TEMPERATURE (°C)
Figure 6.
Normalized Variation in f_SW over V_BUCK Voltage
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 8.
Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LM3444
Submit Documentation Feedback
5