LM3444 datasheet(6/27 Pages) TI1

Part #	LM3444

Description	AC-DC Offline LED Driver

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Manufacturer	TI1 [Texas Instruments]

Direct Link	http://www.ti.com

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6 / 27 page

-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

0

50

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

0

25

50

75

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

0

25

50

75

100 125 150

TEMPERATURE (°C)

LINE VOLTAGE (VAC)

300k

250k

200k

150k

100k

50k

0

80

90

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

80

90

100

110

120

130

140

14 Series connected LEDs

10 Series connected LEDs

LM3444

SNVS682D – NOVEMBER 2010 – REVISED DECEMBER 2015

www.ti.com

6.6 Typical Characteristics

Figure 1. fSW vs Input Line Voltage

Figure 2. Efficiency vs Input Line Voltage

Figure 3. VCC UVLO vs Temperature

Figure 4. Minimum On-Time (tON) vs Temperature

Figure 6. Normalized Variation in fSW Over VBUCK Voltage

Figure 5. Off Threshold (C11) vs Temperature

6

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