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PDF KB3417 Data sheet ( Hoja de datos )
| Número de pieza | KB3417 | |
| Descripción | Constant Current 2 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
KB4317
High Efficiency, Constant Current
2 Watt Boost White-LED Driver
FEATURES
•Operating Voltage:2.3V~6.5V
•High Operating Frequency: 1.2MHz
•High Efficiency: Up to 90%
•High Output Voltage: Up to 32V
•High Output Power: 2W
www.DataSheet4U.com
•Shutdown Current <1PA
•30V Output Over-voltage protection (min)
•Digital Dimming Control.
•Built-in Cycle-by Cycle Current-limiting.
•Built-in Soft-Start Function.
•0.25V Low Reference Voltage(+/-5%)
•Tiny SOT23-6 Package
DESCRIPTION
The KB4317 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 0.25V
low reference voltage minimized the power loss
across the current-setting resistor.
APPLICATIONS
The KB4317 is available in SOT23-6 packages/
• LED Module
• LED Backlight for LCD Display Vcc>3.6V(7 ”~8 ”)
• Constant Current Source!
SIMPLIFIED BLOC DIAGRAM
VIN
EN
FB
OVP
ON/OFF
Control
Logic / PWM
Dimming
Control
CTL
VREF(250mV)
+
-
VREF
0.25V
VBG
1.23V
Soft-Start
Control Logic
22V(300uA)
VBG
+
-
Overvoltage
Protection
Current Limit
0.75A
+
-
N
CTL
GND
LX
REV: 1.0
1
1 page  
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
APPLICATION CIRCUIT
KB4317
High Efficiency, Constant Current
2 Watt Boost White-LED Driver
www.DataSheet4U.com
VIN1
2.4V to 6V
4.7uF
VIN2
2.4V to 6.0V
1uF
ON
10uH
1N5819
1uF
LX
OVP
VIN
KB4317
R=(VF-22V)/300uA
if VF=30V,R=27K
8LEDs
OFF
PWM
Signal
EN FB
GND
I LED
250mVʳ
RSENSE
13.8
Figure 1a. kB4317 Typical Application Circuit with 18mA 8LEDs Output .
VIN
3.6V to 6.0V
4.7uF
10uH
1N5817
10uF
VIN LX
up to 30 LEDs
LED1 ΞΞ LED30
ON
OFF
PWM
Signal
OVP
KB4317
EN FB
GND
I LED
250mVʳ
RSENSE
ΞX1Ξ0
2.2
Figure 1b. kB4317 for 8” Panel LED Back light unit . (10V 113mA)
REV: 1.0
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet KB3417.PDF ] | |
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