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AAT3141ITP-T1 参数 Datasheet PDF下载

AAT3141ITP-T1图片预览
型号: AAT3141ITP-T1
PDF下载: 下载PDF文件 查看货源
内容描述: 高效率1X / 1.5X / 2X电荷泵白光LED应用 [High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications]
分类和应用:
文件页数/大小: 16 页 / 481 K
品牌: ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
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AAT3141  
High Efficiency 1X/1.5X/2X Charge Pump  
for White LED Applications  
brightness. This feature greatly reduces the burden  
on a microcontroller or system IC to manage LED or  
display brightness, allowing the user to "set it, and  
Applications Information  
Constant Current Output Level Settings  
forget it." With its high speed serial interface (1MHz  
data rate), the output current of the AAT3141 can be  
changed successively to brighten or dim LEDs, in  
smooth transitions (e.g. to fade-out) or in abrupt  
steps, giving the user complete programmability  
and real time control of LED brightness.  
The constant current source amplitudes for D1 to D4  
are set via the serial interface according to a loga-  
rithmic scale where each code is 1dB greater than  
the previous code. In this manner, LED brightness  
appears linear with each increasing code count.  
Because the outputs D1 to D4 are true independent  
constant current sources, the voltage observed on  
any single given output will be determined by the  
actual forward voltage (VF) for the LED being driven.  
The individual current level settings are each  
approximately 1dB apart for settings above code 8  
(see Current Level Settings below). The current  
level settings below code 8 are more than 1dB  
apart and serve the needs for transmissive dis-  
plays and other low-current applications.  
Since the output current of the AAT3141 is pro-  
grammable, no PWM (pulse width modulation) or  
additional control circuitry is needed to control LED  
Normalized Current Level Settings  
1.00  
0.10  
0.01  
0.00  
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32  
Code  
Constant Current Source Output Nominal Programming Levels (mA):  
IOUT (typ)  
IOUT (typ)  
Code  
(mA)  
Code  
(mA)  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
0.0  
0.1  
0.2  
0.4  
0.5  
0.7  
1.1  
1.8  
2.0  
2.2  
2.5  
2.8  
3.2  
3.5  
4.0  
4.5  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
5.1  
5.6  
6
7
8
9
10  
12  
13  
15  
17  
19  
21  
24  
27  
30  
3141.2004.07.0.91  
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