AP8801
500mA LED STEP-DOWN CONVERTER
Typical Characteristics (T A = +25°C, V IN = 60V, L =68μH unless otherwise stated.)
10
8
6
4
2
0
-2
-4
-6
-8
-10
100
95
90
85
80
75
70
65
60
55
50
6
12
18
24
30
36
42
48
6
12
18
24
30
36
42
48
700
SUPPLY VOLTAGE (V)
Figure. 8 LED Current vs. Input Voltage
100
SUPPLY VOLTAGE (V)
Figure. 9 Efficiency vs. Input Voltage
90
600
80
500
400
300
200
100
0
70
60
50
40
30
20
10
0
6
12
18
24
30
36
42
48
6
12
18
24
30
36
42
48
SUPPLY VOLTAGE (V)
Figure. 10 Switching Frequency vs. Input Voltage
Figure. 12 Steady State Waveforms
SUPPLY VOLTAGE (V)
Figure. 11 Duty Cycle vs. Input Voltage
Figure.13 Start-Up Showing LED Current Soft -Start
AP8801
Document number: DS31765 Rev. 7 - 2
5 of 14
www.diodes.com
June 2012
? Diodes Incorporated
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