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AT1312B 데이터시트 PDF




Aimtron Technology에서 제조한 전자 부품 AT1312B은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 AT1312B 기능
기능 High Efficiency Constant Current White-LEDs Driver
제조업체 Aimtron Technology
로고 Aimtron Technology 로고


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AT1312B 데이터시트, 핀배열, 회로
www.DataSheet4U.com
AT1312A/B/C
Preliminary Product Information
High Efficiency, Constant Current
White-LEDs Driver
Feature
•Operating Voltage:2.5V to 6.0V.
•High Operating Frequency: 1MHz
•High Output Voltage: Up to 16V/23V/28V
•Shutdown Current <1µA
•16V/23V/28V Output Over-Voltage Protection
•Digital Dimming Control.
•Built-in Cycle-by Cycle Current-Limiting.
•Built-in Soft-Start Function.
•0.2V Low Reference Voltage
•Tiny SOT-26 Package
Application
Description
The AT1312A/B/C 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 1.0
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.
• LED Module
• Compact Back Light Module
• Constant Current Source
The AT1312A/B/C is available in 6-pin SOT-26
packages.
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/23/2006 REV:1.1
1




AT1312B pdf, 반도체, 판매, 대치품
AT1312A/B/C
Preliminary Product Information
High Efficiency, Constant Current
White-LEDs Driver
Electrical Characteristics
Parameter
Symbol
(VIN=2.5V, Ta=+25, unless otherwise noted)
Test Condition
Min. Typ. Max. Units
Operating V IN Range
Under Voltage Thershold
Switch- Off Input Current
Shutdown Current
Feedback Reference
FB Input Bias Current
VIN
UVLO
IIN1
IIN3
VFB
IFB
Over-voltage Threshold
VOVP
Over-voltage Hysteresis
OVP Leakage Current
IOVP
Output Voltage Line Regulation
Switching Frequency
Maximum Duty
Soft-Start charging time
fOSC
DMAX
tSS
Switching Current Limit
ILX
LX ON Resistance
LX Leakage Current
EN Input Current
EN Input Level
EN low Shutdown Delay
RLX
ILeakage
IEN
VIH
VIL
VIN input Voltage
2.5 - 6.0 V
VIN falling, 100mV hysteresis 2.1 2.2 2.3 V
No Switching
- 100 120 µA
EN=0V
- - 1 µA
0.190 0.2 0.210 V
VFB =0.2V
VOUT Rising
VOUT Rising
VOUT Rising
(AT1312A)
(AT1312B)
(AT1312C)
- - 1 µA
- 28 - V
- 23 25 V
- 16 18 V
2V
EN=0V
2.5V< VIN <6.0V
- - 1 µA
- 0.1 - %
- 1 - MHz
- 90 - %
0.05 0.5 - ms
VIN=3.0V,duty cycle=80% ,
(AT1312A)
VIN=3.0V,duty cycle=80% ,
(AT1312B)
VIN=3.0V,duty cycle=80% ,
(AT1312C)
- 400 - mA
- 300 - mA
- 200 - mA
VIN =2.5V, ILX =200mA
- 0.3 - Ω
VLX =16V/23V/28V, EN=0V
EN=5V
0.1V hysteresis
-
-
2.0
-
-
-
5 µA
1 µA
-V
- - 0.8 V
- 4 - ms
EN Low Cycle Time
EN High Cycle Time
Thermal Shutdown
tCYCL
tCYCH
*1
*1
0.05 -
0.05 -
- 120
5
5
-
ms
ms
*1: tCYCL and tCYCH are included rising time and falling time of PWM signal.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/23/2006 REV:1.1
4

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AT1312B 전자부품, 판매, 대치품
Ch1:FB
AT1312A/B/C
Preliminary Product Information
High Efficiency, Constant Current
White-LEDs Driver
Ch2:EN
Ch1:FB : 200mV/div , Ch2:ENABLE: 2V/div ,0.2mS/div
PWM Dimming Control Using the EN Pin
Ch1:IIN
Ch2:FB
Ch3:EN
Ch1:IIN : 200mA/div , Ch2:FB: 100mV/div , Ch3:ENABLE:2V/div ,0.5mS/div
Start-Up Waveform
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
2/23/2006 REV:1.1
7

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