Diodes AP3041 - Manual (Page 8)

Data Sheet
Boost Controller for WLED Driver in Medium-sized LCD Panel AP3041
Oct. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
8
0 20 40 60 80 100
0
20
40
60
80
100
120
140
LED Current (mA
)
PWM Duty (%)
V
IN
=12V, V
PWM
=5V
f
PWM
=70Hz
f
PWM
=200Hz
f
PWM
=500Hz
f
PWM
=1kHz
f
PWM
=2kHz
0 40 80 120 160 200 240 280 320
0
100
200
300
400
500
600
700
800
900
1000
Frequency (kHz)
R
T
(k Ω )
V
IN
=12V
-50 -25 0 25 50 75 100 125 150
0.46
0.48
0.50
0.52
0.54
V
FB
(V
)
Temperature ( o C)
V
IN
=12V
-75 -50 -25 0 25 50 75 100 125 150
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
S
u
pply Cu
rr
en
t (mA)
Temperature ( O C)
V
IN
=12V
V
IN
=24V
Typical Performance Characteristics
Figure 4. LED Current vs. PWM Duty Figure 5. Frequency vs. R
T
Figure 6. V
FB
vs. Temperature Figure 7. Supply Current vs. Temperature