al8805 Diodes, Inc., al8805 Datasheet - Page 7

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

Typical Performance Characteristics (670mA LED current)
AL8805
Document number: DS35030 Rev. 1 - 2
-10%
10%
-10%
-2%
-4%
-6%
-8%
10%
8%
6%
4%
2%
0%
-2%
-4%
-6%
-8%
-10%
8%
6%
4%
2%
0%
10%
-2%
-4%
-6%
-8%
8%
6%
4%
2%
0%
Figure 18: LED current deviation vs Input voltage
Figure 20: LED current deviation vs Input voltage
Figure 22: LED current deviation vs Input voltage
6
6
1 LED
6
2 LEDs
1 LED
2 LEDs 3 LEDs
R
T
L = 100µH
2 LEDs 3 LEDs 4 LEDs
A
S
R
T
L = 68µH
= 25°C
A
= 150mΩ
S
1 LED
9
= 25°C
= 150mΩ
9
9
3 LEDs
12
12
12
4 LEDs
4 LEDs
15
15
15
Input voltage (V)
Input voltage (V)
Input voltage (V)
5 LEDs
5 LEDs
5 LEDs
18
18
18
6 LEDs
6 LEDs
6 LEDs
21
21
21
7 LEDs
7 LEDs
24
7 LEDs
24
24
R
T
L = 33µH
A
S
= 25°C
= 150mΩ
8 LEDs
8 LEDs
27
27
27
8 LEDs
www.diodes.com
30
30
30
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HIGH EFFICIENCY 30V 1A BUCK LED DRIVER
800
700
600
500
400
300
200
100
350
300
250
200
150
100
0
50
0
6
500
450
400
350
300
250
200
150
100
50
6
2 LEDs
Figure 19: Switching frequency vs Input voltage
Figure 21: Switching frequency vs Input voltage
Figure 23: Switching frequency vs Input voltage
R
T
1 LED
0
L = 33µH
1 LED
A
S
R
6
= 25°C
L = 100µH
TA = 25°C
= 150mΩ
2 LEDs 3 LEDs
1 LED
S
= 150mΩ
2 LEDs 3 LEDs 4 LEDs
9
R
T
L = 68µH
9
A
S
= 25°C
= 150mΩ
3 LEDs
9
12
12
(T
12
A
4 LEDs 5 LEDs
4 LEDs
= 25°C unless otherwise stated)
15
15
15
Input voltage (V)
Input voltage (V)
Input voltage (V)
5 LEDs
5 LEDs
18
18
18
6 LEDs
6 LEDs
6 LEDs
21
21
21
AL8805
7 LEDs
24
© Diodes Incorporated
7 LEDs
September 2010
24
7 LEDs
24
8 LEDs
27
8 LEDs
27
8 LEDs
27
30
30
30