Kingbor Technology Co.,Ltd
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KB4317
High Efficiency, Constant Current
2 Watt Boost White-LED Driver
APPLICATION CIRCUIT
VIN1
2.4V to 6V
4.7uF
10uH
1N5819
LX
1uF
R=(VF-22V)/300uA
if VF=30V,R=27K
VIN2
2.4V to 6.0V
1uF
ON
OFF
PWM
Signal
VIN
OVP
8LEDs
KB4317
EN
GND
FB
I
LED
250
mV
R
SENSE
13.8
Figure 1a. kB4317 Typical Application Circuit with 18mA 8LEDs Output .
up to 30 LEDs
10uH
VIN
3.6V to 6.0V
4.7uF
1N5817
LED1
10uF
LED30
VIN
LX
OVP
X10
ON
OFF
PWM
Signal
KB4317
EN
GND
FB
I
LED
250
mV
R
SENSE
2.2
Figure 1b. kB4317 for 8
”
Panel LED Back light unit . (10V 113mA)
REV: 1.0
5