AL8805 datasheet(6/16 Pages) DIODES

6 / 16 page

AL8805

HIGH EFFICIENCY 30V 1A BUCK LED DRIVER

AL8805

Document number: DS35030 Rev. 1 - 2

6 of 16

www.diodes.com

September 2010

Typical Performance Characteristics Continued (TA = 25°C unless otherwise stated)

L = 100µH

RS = 150mΩ

A = 25°C

1 LED

2 LEDs

3 LEDs

4 LEDs

5 LEDs

6 LEDs

7 LEDs

8 LEDs

80%

82%

84%

86%

88%

90%

92%

94%

96%

98%

100%

Input voltage (V)

Figure 13. Efficiency vs Input voltage

1 LED

2 LEDs

3 LEDs

4 LEDs

5 LEDs

6 LEDs

7 LEDs 8 LEDs

0.27

0.29

0.31

0.33

0.35

0.37

0.39

Input voltage (V)

L = 68µH

RS = 300mΩ

TA = 25°C

Figure 14. 330mA LED current vs Input voltage

1 LED

2 LEDs

3 LEDs

4 LEDs

5 LEDs

6 LEDs

7 LEDs

8 LEDs

100

200

300

400

500

600

700

800

Input voltage (V)

L = 68µH

RS = 300mΩ

TA = 25°C

Figure 15. Switching frequency vs Input voltage

1 LED

2 LEDs

3 LEDs 4 LEDs

5 LEDs

6 LEDs 7 LEDs 8 LEDs

0.55

0.6

0.65

0.7

0.75

0.8

Input voltage (V)

L = 68µH

RS = 150mΩ

TA = 25°C

Figure 16. 670mA LED current vs Input voltage

1 LED

2 LEDs

3 LEDs

4 LEDs

5 LEDs

6 LEDs 7 LEDs

8 LEDs

0.80

0.85

0.90

0.95

1.00

1.05

1.10

1.15

1.20

Input voltage (V)

L = 68µH

RS = 100mΩ

TA = 25°C

Figure 17. 1A LED current vs input voltage

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