AP8801
500mA LED STEP-DOWN CONVERTER
Typical Characteristics
0.9
1.256
0.8
1.254
0.7
0.6
1.252
0.5
1.250
0.4
0.3
1.248
0.2
1.246
0.1
0
1.244
0
5 10 15 20 25 30 35 40 45 50 55 60
-40 -25 -10 5
20 35 50 65 80 95 110 125
INPUT VOLTAGE (V)
Figure. 2 Supply Current (not switching) vs. Input Voltage
1.2
1.0
0.8
0.6
0.4
500
450
400
350
300
250
200
150
AMBIENT TEMPERATURE (°C)
Figure. 3 V CTRL vs. Ambient Temperature
100
0.2
50
0
-40 -25 -10 5
20 35 50 65 80 95 110 125
0
0
0.5
1.0
1.5
2.0
600
AMBIENT TEMPERATURE (C)
Figure. 4 R DS(ON) vs Ambient Temperature
800
R SET RESISTANCE ( Ω )
Figure. 5 LED Current vs. R SET
500
400
300
200
100
R SET = 0.56 Ω
R SET = 0.68 Ω
R SET = 1.33 Ω
700
600
500
400
300
200
100
0
0
0.5
1.0 1.5 2.0
2.5
0
0
0.5
1.0 1.5 2.0
2.5
CTRL VOLTAGE (V)
Figure. 6 LED Current vs. V CTRL
CTRL VOLTAGE (V)
Figure. 7 Switching Frequency vs. V CTRL
AP8801
Document number: DS31765 Rev. 7 - 2
4 of 14
www.diodes.com
June 2012
? Diodes Incorporated
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