al8805 Diodes, Inc., al8805 Datasheet - Page 8

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

Typical Performance Characteristics (1A LED current)
AL8805
Document number: DS35030 Rev. 1 - 2
-10%
-10%
10%
10%
-2%
-4%
-6%
-8%
-2%
-4%
-6%
-8%
-10%
8%
6%
4%
2%
0%
8%
6%
4%
2%
0%
10%
-2%
-4%
-6%
-8%
8%
6%
4%
2%
0%
6
Figure 24: LED current deviation vs Input voltage
6
Figure 26: LED current deviation vs Input voltage
Figure 28: LED current deviation vs Input voltage
6
1 LED
1 LED
1 LED
R
T
L = 33µH
2 LEDs
R
T
2 LEDs
A
L = 100µH
S
A
S
2 LEDs
R
T
= 25°C
= 100mΩ
L = 68µH
= 25°C
= 100mΩ
A
S
9
9
9
= 25°C
= 100mΩ
3 LEDs
3 LEDs 4 LEDs 5 LEDs
3 LEDs
12
12
12
4 LEDs 5 LEDs
4 LEDs
15
15
15
Input voltage (V)
Input voltage (V)
Input voltage (V)
5 LEDs 6 LEDs
18
18
18
6 LEDs
21
21
21
6 LEDs 7 LEDs 8 LEDs
7 LEDs 8 LEDs
24
24
7 LEDs
24
27
27
27
8 LEDs
www.diodes.com
30
30
30
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HIGH EFFICIENCY 30V 1A BUCK LED DRIVER
250
200
150
100
350
300
250
200
150
100
50
600
500
400
300
200
100
0
50
0
6
0
6
Figure 25: Switching frequency vs Input voltage
Figure 27: Switching frequency vs Input voltage
Figure 29: Switching frequency vs Input voltage
2 LEDs
6
1 LED
1 LED
R
T
L = 100µH
1 LED
A
S
2 LEDs
R
T
= 25°C
L = 33µH
= 100mΩ
2 LEDs
R
T
A
L = 68µH
S
A
S
= 25°C
= 100mΩ
9
= 25°C
= 100mΩ
9
(T
9
A
3 LEDs
= 25°C unless otherwise stated)
3 LEDs 4 LEDs
3 LEDs
12
12
12
4 LEDs 5 LEDs
4 LEDs
15
15
15
Input voltage (V)
Input voltage (V)
Input voltage (V)
5 LEDs
18
18
18
5 LEDs 6 LEDs 7 LEDs
6 LEDs
21
21
21
6 LEDs 7 LEDs
AL8805
7 LEDs
24
© Diodes Incorporated
September 2010
24
24
27
8 LEDs
27
27
8 LEDs
8 LEDs
30
30
30