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Kingbor Technology - Constant Current 12 Watt Boost White-LED Driver

Numéro de référence KB4313
Description Constant Current 12 Watt Boost White-LED Driver
Fabricant Kingbor Technology 
Logo Kingbor Technology 





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KB4313 fiche technique
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB4313
High Efficiency, Constant Current
12 Watt Boost White-LED Driver
FEATURES
•Operating Voltage:2.4V~6.5V
•High Operating Frequency: 1.5MHz
•High Efficiency: Up to 95%
•High Output Voltage: Up to 34V(max)
•High Output Power: Up to 12W(Vin=12V)
•Shutdown Current <1PA
•16V Output Over-voltage protection (min)
•Digital Dimming Control.
•Built-in Cycle-by Cycle Current-limiting.
•Built-in Soft-Start Function.
•0.2V Low Reference Voltage(3%)
•Tiny SOT23-6 Package
APPLICATIONS
• LED Module
• LED Backlight for LCD Display(7~21)
• Constant Current Source!
• USB host
DESCRIPTION
The KB4313 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 1.5
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 0.2V
low reference voltage minimized the power loss
across the current-setting resistor.
The KB4313 is available in SOT23-6 packages /
SIMPLIFIED BLOC DIAGRAM
VIN
EN
FB
OVP
ON/OFF
Control
Logic / PWM
Dimming
Control
CTL
VREF(200mV)
+
-
VREF
0.2V
VBG
1.23V
Soft-Start
Control Logic
16V-20V(6.5uA)
VBG
+
-
Overvoltage
Protection
Current Limit
1.4A
+
-
N
CTL
GND
LX
REV: 2.0
1

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