al8805 Diodes, Inc., al8805 Datasheet - Page 6

• Manufacturer Part Number: al8805
• Description: High Efficiency 30v 1a Buck Led Driver
• Manufacturer: Diodes, Inc.

Typical Performance Characteristics Continued
AL8805
Document number: DS35030 Rev. 1 - 2
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
100%
800
700
600
500
400
300
200
100
98%
96%
94%
92%
90%
88%
86%
84%
82%
80%
0
Figure 15. Switching frequency vs Input voltage
6
6
6
1 LED
2 LEDs
R
T
1 LED
R
T
L = 68µH
L = 68µH
Figure 17. 1A LED current vs input voltage
R
1 LED
A
S
A
S
L = 100µH
T
2 LEDs
S
= 25°C
2 LEDs
= 300mΩ
= 25°C
= 100mΩ
A
= 150mΩ
Figure 13. Efficiency vs Input voltage
= 25°C
3 LEDs
9
9
9
3 LEDs
3 LEDs
4 LEDs
12
12
12
4 LEDs
4 LEDs 5 LEDs
15
15
15
5 LEDs
Input voltage (V)
Input voltage (V)
Input voltage (V)
5 LEDs
18
18
18
6 LEDs
6 LEDs
21
21
6 LEDs 7 LEDs
21
7 LEDs
24
24
24
7 LEDs
8 LEDs
27
27
27
8 LEDs
8 LEDs
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30
30
30
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HIGH EFFICIENCY 30V 1A BUCK LED DRIVER
0.39
0.37
0.35
0.33
0.31
0.29
0.27
(T
0.75
0.65
0.55
0.8
0.7
0.6
A
Figure 14. 330mA LED current vs Input voltage
Figure 16. 670mA LED current vs Input voltage
6
= 25°C unless otherwise stated)
6
2 LEDs
1 LED
1 LED
R
T
L = 68µH
2 LEDs 3 LEDs 4 LEDs
A
S
R
T
L = 68µH
= 25°C
A
= 300mΩ
S
= 25°C
= 150mΩ
9
9
3 LEDs
12
12
4 LEDs
15
15
Input voltage (V)
Input voltage (V)
5 LEDs
18
18
5 LEDs
6 LEDs 7 LEDs 8 LEDs
21
21
6 LEDs
AL8805
© Diodes Incorporated
September 2010
24
24
7 LEDs 8 LEDs
27
27
30
30