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KB4313 데이터시트 PDF




Kingbor Technology에서 제조한 전자 부품 KB4313은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 KB4313 기능
기능 Constant Current 12 Watt Boost White-LED Driver
제조업체 Kingbor Technology
로고 Kingbor Technology 로고


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KB4313 데이터시트, 핀배열, 회로
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




KB4313 pdf, 반도체, 판매, 대치품
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB4313
High Efficiency, Constant Current
12 Watt Boost White-LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS
ˌˇ
ˌ˅
ˌ˃
ˋˋ
ˋˉ
ˋˇ
ˋ˅
ˋ˃
ˊˋ
ˊˉ
˅
Efficiency vs. Vin (4 LED)
L:SR0302 D:RB501-40
˜̂ː˄˃˃̀˔ʿʳ˟ː˅˅̈˛
˜̂ː˄˃˃̀˔ʿʳ˟ː˄˃̈˛
˜̂ː˄˃˃̀˔ʿ˟ːˉˁˋ̈˛
ˆˇˈ
Vin (V)
ˉ
ˌˇ
ˌ˅
ˌ˃
ˋˋ
ˋˉ
ˋˇ
ˋ˅
ˋ˃
˅
Efficiency vs. Vin (3 LED)
L:SR0302 D:RB501-40
˜̂ː˄˃˃̀˔ʿʳ˟ː˅˅̈˛
˜̂ː˄˃˃̀˔ʿʳ˟ː˄˃̈˛
˜̂ː˄˃˃̀˔ʿ˟ːˉˁˋ̈˛
ˆ ˇˈ
Vin (V)
ˉ
˄˃˃
ˌˈ
ˌ˃
ˋˈ
ˋ˃
ˊˈ
ˊ˃
ˈ˃
Conversion Efficiency
L:SR0302 D:RB501-40
ˇ˟˘˗̆ʿʳ˟ː˅˅̈˛ʿ˩˼́ːˆ˩
ˆ˟˘˗̆ʿ˟ː˅˅̈˛ʿ˩˼́ːˆ˩
ˉ˃ ˊ˃ ˋ˃ ˌ˃
LED CURRENT(mA)
˄˃˃
CH1:EN CH3:FB
CH1:LX CH3:VOUT Ripple CH4:ILX
Switching Transient Waveform
CH1:EN CH3:FB CH4:IIN
PWM Dimming Control Using the EN Pin
REV: 2.0
Start-Up Waveform
4

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KB4313 전자부품, 판매, 대치품
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB4313
High Efficiency, Constant Current
12 Watt Boost White-LED Driver
Function Description
The KB4313 is a high efficiency and constant current DC-DC converter IC which is designed primarily
for use in LED module applications. The output voltage of the step-up converter can be set from Vin to
16V with external sense resistor. The device suits to drive series-connected LEDs and provides even
illumination by sourcing the same output current through each LED. KB4313 also consists of a logic
shutdown , cycle-by-cycle current-limited , soft-start functions.
Logic control input or PWM duty cycle control allows easy adjustment of LEDs brightness and on/off
control. The average LED current is proportionable the duty-cycle of the PWM signal. Typical PWM
frequency should be between 100Hz and 1kHz.
The boost converter operates in current-mode PWM and a constant frequency of 1.5 MHz. Depending
on duty cycle of each switching cycle can regulate output voltage. On the rising edge of the internal
clock , the control and driver logic block sets internal flip-flop when the output voltage is too low,
which turns on the N-MOS. The external inductor current ramps up linearly, storing energy in a
magnetic filed. Once peak current of inductor over trans-conductance output level , the N-MOS turns
off, the flip-flop resets, and external schottky diode turns on. This forces the current through the
inductor to ramp back down, transferring the energy stored in the magnetic field to the output capacitor
and LEDs. To reduce external component amount , the device will be built-in internal loop
compensation.
ʳ
Enable Control
Digital logic of EN provides an electrical ON/OFF control of the power supply. Connecting this pin to
ground or to any voltage less than 0.5V and sustain the level over 4ms will completely turn off the
regulator. In this state, current drain from the input supply is less than 1uA, the internal reference, error
amplifier, comparators, and biasing circuitry turn off . If holding time of low level is less than 3ms on
this pin, then the device only shutdown driver logic block.
ʳ
Dimming Control
Digital logic of EN also provides LEDs brightness control by applying a PWM signal on EN pin. With
this way, the LEDs operate with either zero or full current . The average LED current is proportional to
the duty-cycle of the PWM signal. Typical PWM frequency should be between 100Hz and 1kHz.
Output current is given by:
I LED
200mV u TON PWM ʳ
RSENSE u TS PWM
Where:
TON-PWM : On time of PWM signal
TS-PWM : A cycle time of PWM signal
If dimming control is not required , EN works as a simple on/off control. Drive EN high to enable the
device , or drive EN low for shutdown.
ʳ
REV: 2.0
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