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PDF KB4314 Data sheet ( Hoja de datos )
| Número de pieza | KB4314 | |
| Descripción | Constant Current 1 Watt Boost White-LED Driver | |
| Fabricantes | Kingbor Technology | |
| Logotipo |  |
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Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB4314
High Efficiency, Constant Current
1 Watt Boost White-LED Driver
FEATURES
•Operating Voltage:1.8V~6.5V
•High Operating Frequency: 1.2MHz
•High Efficiency: Up to 92%
•High Output Voltage: Up to 30V(max)
•High Output Power: 1W
•Shutdown Current <1PA
•30V Output Over-voltage protection (min)
•Digital Dimming Control.
•Built-in Cycle-by Cycle Current-limiting.
•Built-in Soft-Start Function.
•0.105V Low Reference Voltage(+/-6.6%)
•Tiny SOT23-6 Package
APPLICATIONS
• LED Module
• LED Backlight for LCD Display (3.5”~6.5” )
• Constant Current Source!
DESCRIPTION
The KB4314 step-up converter drives white LEDs
with a constant current to provide backlight in cell
phones, PDAs, and other hand-held devices. It
features allowing series connection of the white
LEDs so that the LED currents are identical for
uniform brightness. An enable input can be pulsed
repeatedly to adjust LED’s brightness. The fast 1.2
MHz current-mode PWM control allows for smaller
capacitor and inductor. Fault condition protection
uses cycle-by-cycle current limiting to sense
maximum inductor current, thermal protection and
over-voltage protection. Also included soft-start
eliminates inrush current during start-up. The 0.105V
low reference voltage minimized the power loss
across the current-setting resistor.
The KB4314 is available in SOT23-6 packages/
SIMPLIFIED BLOC DIAGRAM
VIN
EN
FB
OVP
ON/OFF
Control
Logic / PWM
Dimming
Control
CTL
VREF(105mV)
+
-
VREF
0.105V
VBG
1.23V
Soft-Start
Control Logic
30V
VBG
+
Overvoltage
Protection
-
Current Limit
0.45A
+
-
N
CTL
GND
LX
REV: 1.0
1
1 page  
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
APPLICATION CIRCUIT
KB4314
High Efficiency, Constant Current
1 Watt Boost White-LED Driver
VIN1
3.3V to 6V
4.7uF
ON
OFF
PWM
Signal
10uH
1N5819
1uF
VIN LX
OVP
KB4314
EN FB
GND
8LEDs
5.6
Figure 1a. kB4314 Typical Application Circuit with 18mA 30V Output .
VIN
1.8V to 4.2V
2.2uF
ON
OFF
PWM
Signal
10uH
1N5817
1uF
VIN LX
OVP
KB4314
EN FB
GND
2LEDs
5.6
Figure 1b. kB4314 Typical Application Circuit with 18mA 7V Output .
REV: 1.0
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet KB4314.PDF ] | |
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