Kingbor Technology Co.,Ltd
KB4317
TEL:(86)0755-26508846 FAX:(86)0755-26509052
High Efficiency, Constant Current
2 Watt Boost White-LED Driver
RECOMMENDED OPERATION CONDITIONS
Parameter
Symbol
Values
Typ.
ѧ
Unit
Min.
2.3
Max.
6.5
Power supply voltage
Operating temperature
VIN
Top
V
к
-30
+25
+85
ELECTRICAL CHARACTERISTICS
(VIN=2.5V, Ta=+25к, unless otherwise noted)
Parameter
Operating V IN Range
Symbol
Test Condition
VIN input Voltage
Min. Typ. Max. Units
VIN
2.3
-
6.5
1.6
V
Under Voltage Thershold
Switch- Off Input Current
Shutdown Current
UVLO VIN falling, 100mV hysteresis 1.4
1.5
V
uA
uA
V
IIN1
IIN3
No Switching , FB>0.3V
EN=0V
-
-
100 350
1
-
Feedback Reference (+/-5%)
FB Input Bias Current
Over-voltage Threshold
Over-voltage Hysteresis
OVP Leakage Current
VFB
IFB
0.238 0.25 0.262
VFB =0.105V
VOUT Rising
-
17
-
22
5
1
25
uA
V
VOVP
V
uA
IOVP
EN=0V
2.5V< VIN <6.0V
-
-
-
1
-
Output Voltage Line Regulation
0.1
%
Switching Frequency
Maximum Duty
fOSC
DMAX
tSS
1.0
1.2
90
1.4 MHz
-
0.05
-
-
%
ms
A
Soft-Start charging time
Switching Current Limit
0.2
0.75
I
VIN=3.0V,duty cycle=80% ,
-
LX
VIN =2.5V, I
LX
=750mA
Ө
LX ON Resistance
LX Leakage Current
EN Input Current
RLX
ILeakage
IEN
-
-
0.40
-
1
VLX =16V, EN=0V
EN=5V
-
-
uA
uA
V
-
1
VIH
VIL
1.5
-
-
-
0.4
EN Input Level
-
V
EN low Shutdown Delay
EN Low Cycle Time
EN High Cycle Time
4
ms
ms
ms
tCYCL
tCYCH
Note(1)
Note(1)
0.05
0.05
4
4
Note(1): tCYCL and tCYCH are included rising time and falling time of PWM signal.
Recommended PCB Layout
REV: 1.0
3
KINGBOR [ KINGBOR TECHNOLOGY CO ]
