Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB4314
High Efficiency, Constant Current
1 Watt Boost White-LED Driver
RECOMMENDED OPERATION CONDITIONS
Parameter
Power supply voltage
Operating temperature
Symbol
V
IN
Top
Min.
1.8
-30
Values
Typ.
+25
Max.
6.5
+85
Unit
V
ELECTRICAL CHARACTERISTICS
(V
IN
=2.5V, Ta=+25
, unless otherwise noted)
Parameter
Operating V
IN
Range
Symbol
Test Condition
V
IN
input Voltage
V
IN
V
IN
falling, 100mV hysteresis
No Switching , FB>0.2V
EN=0V
V
FB
=0.105V
V
OUT
Rising
EN=0V
2.5V< V
IN
<6.0V
Min.
1.8
Typ. Max. Units
-
6.5
V
V
uA
uA
V
uA
V
V
uA
%
MHz
%
ms
A
uA
uA
V
V
ms
ms
ms
Under Voltage Thershold
UVLO
Switch- Off Input Current
I
IN1
Shutdown Current
I
IN3
Feedback Reference (+/-6.6%) V
FB
FB Input Bias Current
I
FB
Over-voltage Threshold
V
OVP
Over-voltage Hysteresis
OVP Leakage Current
I
OVP
Output Voltage Line Regulation
Switching Frequency
Maximum Duty
Soft-Start charging time
Switching Current Limit
LX ON Resistance
LX Leakage Current
EN Input Current
EN Input Level
EN low Shutdown Delay
EN Low Cycle Time
EN High Cycle Time
f
OSC
D
MAX
t
SS
ILX
R
LX
I
Leakage
I
EN
V
IH
V
IL
t
CYCL
t
CYCH
1.4
1.5
1.6
-
100 350
-
-
1
0.098 0.105 0.112
-
-
1
28
30
32
2
-
-
1
-
1.0
-
0.05
-
-
-
-
1.5
-
0.05
0.05
0.1
1.2
90
0.2
0.45
0.40
-
-
-
-
4
-
1.4
-
-
-
1
1
-
0.4
4
4
V
IN
=3.0V,duty cycle=80% ,
V
IN
=2.5V, ILX =750mA
V
LX
=16V, EN=0V
EN=5V
Note(1)
Note(1)
Note(1): t
CYCL
and t
CYCH
are included rising time and falling time of PWM signal.
Recommended PCB Layout
REV: 1.0
3
KINGBOR [ KINGBOR TECHNOLOGY CO ]
