Data Sheet
WHITE LED STEP-UP CONVERTER
AP3019A
Typical Performance Characteristics
WLED forward voltage (VF) is 3.45V at IF=20mA, unless otherwise noted.
86
84
82
80
78
76
74
72
70
83
82
81
80
79
78
77
76
75
74
73
IOUT=20mA, 8 LEDs,TA=25OC
CIN=1µF, COUT=0.22µF, L=22µH
VIN=3.6V, IOUT=20mA, 8 LEDs
CIN=1µF, COUT=0.22µF, L=22µH
-50
-25
0
25
50
75
100
3.0
3.5
4.0
4.5
5.0
Junction Temperature (oC)
Input Voltage (V)
Figure 4. Efficiency vs. Junction Temperature
Figure 5. Efficiency vs. Input Voltage
350
86
85
84
83
82
81
80
79
78
77
76
300
250
200
150
100
50
VIN=3.6V, IOUT=20mA,TA=25OC
CIN=1µF, COUT=0.22µF, L=22µH
0
2
3
4
5
6
7
8
0
200
400
600
800
1000
LED's Number
Schottky Forward Drop (mV)
Figure 6. Efficiency vs. LED’s Number
Figure 7. Schottky Forward Current vs.
Schottky Forward Drop
Mar. 2010 Rev. 1.7
BCD Semiconductor Manufacturing Limited
6
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
