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PDF KB4312 Data sheet ( Hoja de datos )
| Número de pieza | KB4312 | |
| Descripción | Constant Current Switching Regulator | |
| Fabricantes | Kingbor Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de KB4312 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB4312
Very Low
Cost
Tiny Package, High Performance, Constant Current
Switching Regulator for White LED
FEATURES
•Operating Voltage:2.5V~6.5V
•High Operating Frequency: 1.2MHz
•High Efficiency: Up to 92%
•High Output Voltage: Up to 28V(max)
•Shutdown Current <1PA
•18V Output Over-voltage protection (ADJ)
•Digital Dimming Control.
•Built-in Cycle-by Cycle Current-limiting.
•Built-in Soft-Start Function.
•0.24V Low Reference Voltage(+/-5%)
•Tiny SOT23 Package
APPLICATIONS
• LED Module
• LED Backlight for LCD Display (1” ~6.5 ” )
• Constant Current Source!
DESCRIPTION
The KB4312 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 0.24V
low reference voltage minimized the power loss
across the current-setting resistor.
The KB4312 is available in SOT23 packages /
SIMPLIFIED BLOC DIAGRAM
VIN
6
EN 4
ON/OFF
Control
Logic / PWM
Dimming
Control
CTL
VREF
0.240V
VBG
1.27V
Soft-Start
+
FB
OVP
3
5 17V
-
KB4312B FB=240mV
KB4312A FB=1.27V
VBG
+
Overvoltage
Protection
-
Control Logic
Current Limit
0.25A
+
-
N
CTL
2
GND
1 LX
REV: 3.2
1
1 page  
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
APPLICATION CIRCUIT
Vin=2.7~6V
10uH
VOUT=6~24V
KB4312
1uF
1N5819
1uF
1
LX
6 VCC OVP 5
KB4312B
PWM or ON/OFF
4 EN
FB 3
GND
2
240mV
Figure 1a.KB4312 For 2 to 6 LEDs Back Light Unit.(Step-Up)
20MA
Rset
12R~51R
Vin=2.7~6V
1uF
ON/OFF
BAT54s
1uF 3
1
2
10uH
1N5819
1
LX
5 VCC
FB 3
KB4312A
4 EN
GND
2
R1
510K
1.27V
R2
47K
2.2K
-10V
1uF 10V
10uF
VOUT +15V (15mA)
10uF
R1= (
VOUT
1.27V
-1 ) x R2
Vin=5~20V
1K 1uF
5.1V
1uF
ON/OFF
10uH
1uF 3
1
2
BAT54s
1uF
3
1
2
2.2K
1uF 10V
-10V
10uF
VOUT +15V(15mA)
1
LX
5 VCC
R1
510K
FB 3 1.27V
KB4312A
4 EN
GND
2
R2
47K
10uF
R1= (
VOUT
1.27V
-1 ) x R2
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet KB4312.PDF ] | |
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