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參數(shù)資料
| 型號(hào)： | AAT1231 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | Step-Up DC/DC Converters for White LED Backlight Applications |
| 中文描述： | 升壓型DC / DC轉(zhuǎn)換器，用于白光LED背光應(yīng)用 |
| 文件頁數(shù)： | 1/27頁 |
| 文件大?。?/td> | 1535K |
| 代理商： | AAT1231 |
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AAT1231/1231-1
Step-Up DC/DC Converters for
White LED Backlight Applications
1231.2007.01.1.2
1
SwitchReg
General Description
The AAT1231/1231-1 are high frequency, high effi-
ciency constant current boost converters capable of
24V maximum output voltage. Both devices are
ideal power solutions for backlight applications with
up to six white LEDs in series or up to twelve white
LEDs in a parallel/series configuration. The input
voltage is 2.7V to 5.5V for single-cell lithium-
ion/polymer (Li-ion) based portable devices.
The LED current is digitally controlled across a 6x
operating range using AnalogicTech’s Simple Serial
Control (S
2
Cwire) interface. Programmability
across 26 discrete current steps provides high reso-
lution, low noise, flicker-free, constant LED outputs.
In programming AAT1231 operation, LED brightness
increases based on the data received at the EN/SET
pin. In programming AAT1231-1 operation, LED
brightness decreases based on the data received at
the EN/SETpin. The SELlogic pin changes the feed-
back voltage between two programmable ranges.
The AAT1231 and the AAT1231-1 feature high current
limit and fast, stable transitions for stepped or pulsed
current applications. The high switching frequency (up
to 2MHz) provides fast response and allows the use
of ultra-small external components, including chip
inductors and capacitors. Fully integrated control cir-
cuitry simplifies design and reduces total solution size.
The AAT1231 and the AAT1231-1 offer a true load
disconnect feature which isolates the load from the
power source while in the OFF or disabled state. This
eliminates leakage current, making the devices ideal-
ly suited for battery-powered applications.
The AAT1231 and the AAT1231-1 are available in Pb-
free, thermally-enhanced 12-pin TSOPJW packages.
Features
Input Voltage Range: 2.7V to 5.5V
Maximum Continuous Output 24V @ 50mA
Drives 6 LEDs in Series, 12 LEDs in Parallel/
Series Configuration
— Constant LED Current with 6% Accuracy
Digital Control with S
2
Cwire Single Wire Interface
— 26 Discrete Steps
— No PWM Control Required
— No Additional Circuitry
Up to 82% Efficiency
Up to 2MHz Switching Frequency Allows
Small External Chip Inductor and Capacitors
Hysteretic Control
— No External Compensation Components
— Excellent Load Transient Response
— High Efficiency at Light Loads
Integrated Soft Start with No External Capacitor
True Load Disconnect Guarantees <1.0μA
Shutdown Current
Selectable Feedback Voltage Ranges for
High Resolution Control of Load Current
Short-Circuit, Over-Voltage, and Over-
Temperature Protection
12-Pin TSOPJW Package
-40°C to +85°C Temperature Range
Applications
Digital Still Cameras (DSCs)
Mobile Handsets
MP3 Players
PDAs and Notebook PCs
White LED Drivers
Typical Application
LIN
C
2
2.2μF
R
2
226k
Ω
R
3
12k
Ω
R
1
(R
BALLAST
)
30.1
Ω
C
1
2.2μF
L = 2.2μH
DS1
Capable of Driving
Six LEDs in Series
(see Applications Section)
OSRAM
LW M678
EN/SET
PGND
PVIN
AAT1231/
1231-1
SW
FB
SEL
Up to 24V/
50mA max
VIN
AGND
OVP
Li-Ion:
V
IN
= 2.7V to 4.2V
Enable/Set
Select
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT1231ITP-1-T1 | Step-Up DC/DC Converters for White LED Backlight Applications |
| AAT1231ITP-T1 | Step-Up DC/DC Converters for White LED Backlight Applications |
| AAT1232 | 24V 100mA Step-Up Converter |
| AAT1232IRN-T1 | 24V 100mA Step-Up Converter |
| AAT1232ITP-T1 | 24V 100mA Step-Up Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1231_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Step-Up DC/DC Converters for White LED Backlight Applications |
| AAT1231ITP | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Step-Up DC/DC Converters for White LED Backlight Applications |
| AAT1231ITP-1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Step-Up DC/DC Converters for White LED Backlight Applications |
| AAT1231ITP-1-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1231ITP-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
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