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參數(shù)資料
| 型號： | AAT3151IWP-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 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 426K |
| 代理商： | AAT3151IWP-T1 |
AAT3151
High Efficiency 1X/1.5X/2X Charge Pump
For White LED Applications
3151.2005.12.1.7
9
al interface (>1MHz data rate), the LED current
drive 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 program-
mability and real-time control of LED brightness.
For each Max Current scale, there are 16 current
level settings separated from one another by
approximately 1dB. Code 1 is full-scale current and
Code 15 is full-scale current attenuated by roughly
14dB. Code 16 is reserved as a "no current" setting
(see Table 1).
The AAT3151 has an additional Low Current mode
with reduced quiescent current. This mode is espe-
cially useful for low-current applications where a
continuous, low-current state is maintained. The
reduction in quiescent current significantly reduces
the impact due to maintaining a continuous back-
lighting state.
Table 1: Constant Current Programming
Levels (mA)
2
.
AS
2
Cwire Serial Interface
The AS
2
Cwire single wire interface is used to set
the possible combinations of current levels and
LED channel states. AS
2
Cwire has addressing
capability for multiple data registers. With multiple
data registers, the AAT3151 main and sub-chan-
nels can be programmed together or independent-
ly from one another.
AS
2
Cwire relies on the number of rising edges of
the EN/SET pin to address and load the registers.
AS
2
Cwire latches data or address after the EN/SET
pin has been held high for time T
LAT
. Address or
data is differentiated by the number of EN/SET ris-
ing edges. Since the data registers are 4 bits each,
the differentiating number of pulses is 2
4
or 16, so
that Address 1 is signified by 17 rising edges,
Address 2 by 18 rising edges, and so forth. Data is
set to any number of rising edges between 1 and
including 16. A typical write protocol is a burst of
EN/SET rising edges, signifying a particular
address, followed by a pause with EN/SET held
high for the T
LAT
timeout period, a burst of rising
edges signifying data, and a T
LAT
timeout for the
data registers. Once an address is set, then multi-
ple writes to the corresponding data register are
allowed.
When EN/SET is held low for an amount of time
greater than T
OFF
, the AAT3151 enters shutdown
mode and draws less than 1μA from the supply.
Address 1 is the default address on the first rising
edge after the AAT3151 has been disabled.
Whenever shutdown mode is entered, all registers
are reset to 1.
20mA Max
1
I
OUT
(mA)
20.0
17.8
15.9
14.3
12.7
11.1
10.2
8.9
7.9
7.0
6.3
5.7
5.1
4.4
4.1
0.0
30mA Max
I
OUT
(mA)
30.0
26.7
23.8
21.4
19.0
16.7
15.2
13.3
11.9
10.5
9.5
8.6
7.6
6.7
6.2
0.0
15mA Max
I
OUT
(mA)
15.0
13.3
11.9
10.7
9.5
8.3
7.6
6.7
6.0
5.2
4.8
4.3
3.8
3.3
3.1
0.0
Data
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1. The device defaults to the 20mA Max scale. Use the Max Current Register to change the Max Scale.
2. There is an additional Low Current mode with currents down to 50μA. See the Low Current Register Settings section.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3152 | 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 |
| AAT3152_05 | 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 |
| AAT3152IWP-T1 | 制造商:SKYWORKS SOLUTIONS INC 功能描述:1X,1.5X,2X WLED CHPMP 12TDFN TR 制造商:Skyworks Solutions Inc 功能描述:LED DRIVER IC |
| AAT3153 | 制造商:AAT 制造商全稱:AAT 功能描述:High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications |
| AAT3153ISN-T1 | 制造商:AAT 制造商全稱:AAT 功能描述:High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications |
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