LM3444MM datasheet(5/30 Pages) TI

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-50 -30 -10 10 30 50 70 90 110130150

1.25

1.26

1.27

1.28

1.29

TEMPERATURE (°C)

OFF Threshold at C11

VBUCK (V)

1.50

1.25

1.00

0.75

0.50

0.25

100

150

200

3 LEDs

5 LEDs

7 LEDs

9 LEDs

Series

connected LEDs

8.0

7.5

7.0

6.5

6.0

-50

-25

100 125 150

UVLO (VCC) Rising

UVLO (VCC) Falling

TEMPERATURE (°C)

200.0

190.0

180.0

170.0

160.0

150.0

-50

-25

100 125 150

TEMPERATURE (°C)

LINE VOLTAGE (VAC)

300k

250k

200k

150k

100k

50k

100

110

120

130

140

C11 = 2.2 nF, R3 = 348 k:

7 LEDs in Series (VO = 24.5V)

LINE VOLTAGE (VAC)

95.0

90.0

85.0

80.0

75.0

100

110

120

130

140

14 Series connected LEDs

10 Series connected LEDs

LM3444

www.ti.com

SNVS682C – NOVEMBER 2010 – REVISED MAY 2013

TYPICAL PERFORMANCE CHARACTERISTICS

fSW vs Input Line Voltage

Efficiency vs Input Line Voltage

Figure 3.

Figure 4.

V UVLOCC vs Temperature

Min On-Time (tON) vs Temperature

Figure 5.

Figure 6.

Off Threshold (C11) vs Temperature

Normalized Variation in fSW over VBUCK Voltage

Figure 7.

Figure 8.

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