AL8805W5-7 datasheet(5/16 Pages) DIODES

Part #	AL8805W5-7

Description	HIGH EFFICIENCY 30V 1A BUCK LED DRIVER

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Manufacturer	DIODES [Diodes Incorporated]

Direct Link	http://www.diodes.com

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5 / 16 page

AL8805

HIGH EFFICIENCY 30V 1A BUCK LED DRIVER

AL8805

Document number: DS35030 Rev. 1 - 2

5 of 16

www.diodes.com

September 2010

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

VIN = 12V

1LED

RSET = 150mΩ

L = 68µH

ILED

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

0%

20%

40%

60%

80%

100%

PWM Duty Cycle

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

LED Current Error

Figure 7. ILED vs PWM duty cycle

0

50

100

150

200

250

300

0

5

10

15

20

25

30

VIN (V)

VCTRL = Open

VSET = VIN

TA = 25°C

Figure 8. SW RDS(ON) vs input voltage

100

150

200

250

300

350

400

-40

-15

10

35

60

85

110

Ambient Temperature (°C)

VCTRL = Open

VSET = VIN = 12V

F

igure 9. SW RDS(ON) vs temperature

VSENSE

VSW

80

85

90

95

100

105

110

115

120

125

130

02

468

Time (µs)

-2

0

2

4

6

8

10

12

14

16

18

RSET = 150mΩ

L = 68µH

VIN = 12V

1LED Load

Figure 10. SW Output switching characteristics

ILED

VSW

VCTRL

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0

50

100

150

200

Time (µs)

0

2

4

6

8

10

12

14

16

18

20

RSET = 150mΩ, L = 68µH, VIN = 12V, 1 LED Load, TA = 25°C

Duty Cycle = 5%

Figure 11. PWM dimming

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

6

9

12

15

18

21

24

27

30

Input voltage (V)

L = 33µH

RS = 150mΩ

TA = 25°C

2 LED

Figure 12. Duty cycle vs Input voltage

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