2.3

1.8

1.4

0.9

0.5

0.0

0.0

0.3

0.5

0.8

1.0

1.3

INPUT VOLTAGE (V)

1.7

1.4

1.0

0.7

0.3

0.0

0

14

28

42

56

70

7 LEDs

5 LEDs

3 LEDs

1 LED

INPUT VOLTAGE (V)

2.40

2.35

2.30

2.25

2.20

2.15

2.10

20

24

28

32

36

40

44

INPUT VOLTAGE (V)

2.5

2.4

2.3

2.2

2.1

2.0

20

32

44

56

68

80

INPUT VOLTAGE (V)

100

95

90

85

80

75

70

0

10

20

30

40

50

INPUT VOLTAGE (V)

100

95

90

85

80

75

70

0

20

40

60

80

300856b3

LM3409, LM3409HV, LM3409-Q1

SNVS602J – MARCH 2009 – REVISED MAY 2013

www.ti.com

Typical Performance Characteristics (continued)

LM3409 Efficiency vs. Input Voltage

LM3409HV Efficiency vs. Input Voltage

(1)

(2)

Figure 9.

Figure 10.

LM3409 LED Current vs. Input Voltage

LM3409HV LED Current vs. Input Voltage

(3)

(4)

Figure 11.

Figure 12.

Amplitude Dimming Using IADJ Pin

Normalized Switching Frequency vs. Input Voltage

Figure 13.

Figure 14.

(1)

The measurements were made using the Bill of Materials from Design #3 except the LM3409 was substituted for the LM3409HV.

(2)

The measurements were made using the Bill of Materials from Design #3.

(3)

The measurements were made using the Bill of Materials from Design #3 except the LM3409 was substituted for the LM3409HV.

(4)

The measurements were made using the Bill of Materials from Design #3.

6

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