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參數(shù)資料
| 型號(hào)： | AAT3156ISN-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications |
| 中文描述： | 高效率1x/1.5x/2x電荷泵白光LED應(yīng)用 |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大?。?/td> | 333K |
| 代理商： | AAT3156ISN-T1 |
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AAT3156
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
8
3156.2005.06.1.1
Functional Block Diagram
1X, 1.5X and 2X
Charge Pump
D/A
D/A
D/A
D/A
D/A
D/A
VIN
EN/SET
GND
D6
D5
D4
D3
D2
D1
VOUT
C1+
C1- C2+
C2-
Soft-Start
Control
1MHz
Oscillator
Voltage
Reference
AS
2
Cwire
Interface
6 x 16 bit
ROM
6 x 16 bit
ROM
Functional Description
The AAT3156 is a tri-mode load switch (1X) and
high efficiency (1.5X or 2X) charge pump device
intended for white LED backlight applications. To
maximize power conversion efficiency, an internal
sensing circuit monitors the voltage required on
each constant current sink input and sets the load
switch and charge pump modes based on the input
battery voltage and the current sink input voltage.
As the battery discharges over time, the AAT3156
charge pump is enabled when any of the six cur-
rent sinks near dropout. The charge pump initially
starts in 1.5X mode. If the charge pump output
drops enough for any current sink to become close
to dropout, the charge pump will automatically tran-
sition to 2X mode.
The AAT3156 requires only four external compo-
nents: two 1μF ceramic capacitors for the charge
pump flying capacitors (C1 and C2), one 1μF
ceramic input capacitor (C
IN
), and one 0.33μF to
1μF ceramic charge pump output capacitor (C
OUT
).
The AAT3156 constant current sinks can drive six
individual LEDs with a maximum current of 30mA
per channel. The AS
2
Cwire serial interface enables
the AAT3156 and sets the constant current sink
magnitudes. AS
2
Cwire addressing allows the LED
main channels D1-D4 to be controlled independ-
ently from the LED sub-channels D5-D6.
Constant Current Output Level Settings
The constant current level for the LED channels is
set via the AS
2
Cwire serial interface according to a
logarithmic scale. In this manner, LED brightness
appears linearly when the settings in the scale are
traversed. Because the inputs D1 to D6 are true
independent constant current sinks, the voltage
observed on any single given input will be deter-
mined by the difference between V
OUT
and the
actual forward voltage (V
F
) of the LED being driven.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3157 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications |
| AAT3157ITP-T1 | 制造商:Skyworks Solutions Inc 功能描述:IC LED DRVR BCKLGHT FLASH 12TSOP 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3158 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications |
| AAT3158ITP-T1 | 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3159 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications |
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