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參數(shù)資料
| 型號(hào)： | AAT1231ITP-T1 |
| 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(yè)數(shù)： | 16/27頁(yè) |
| 文件大?。?/td> | 1535K |
| 代理商： | AAT1231ITP-T1 |
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AAT1231/1231-1
Step-Up DC/DC Converters for
White LED Backlight Applications
16
1231.2007.01.1.2
Figure 9: AAT1231/1231-1 S
2
Cwire Timing Diagram to Program the Output Voltage.
Table 2: AAT1231 S
2
Cwire Reference Feedback Voltage Control Settings with R
BALLAST
= 30.1
Ω
(Assume Nominal Values).
Rising Clock
Edges/Data
Register
SEL = Low
SEL = High
Reference
Voltage (V)
LED Current (mA);
R
BALLAST
= 30.1
Ω
3.32
3.99
4.65
5.32
5.98
6.64
7.31
7.97
8.64
9.30
9.97
10.63
11.30
11.96
12.62
13.29
Reference
Voltage (V)
LED Current (mA);
R
BALLAST
= 30.1
Ω
9.97
10.63
11.30
11.96
12.62
13.29
13.95
14.62
15.28
15.95
16.61
17.28
17.94
18.60
19.27
19.93
1
2
3
4
5
6
7
8
9
0.1 (default)
0.12
0.14
0.16
0.18
0.20
0.22
0.24
0.26
0.28
0.30
0.32
0.34
0.36
0.38
0.40
0.3 (default)
0.32
0.34
0.36
0.38
0.40
0.42
0.44
0.46
0.48
0.50
0.52
0.54
0.56
0.58
0.60
10
11
12
13
14
15
16
1
EN/SET
2
n-1
n
≤
16
Data Reg
0
n-1
0
T
HI
T
LO
T
LAT
T
OFF
S
2
Cwire Feedback Voltage
Programming
The FB pin voltage is set to the default level at ini-
tial powerup. The AAT1231 and the AAT1231-1 are
programmed through the S
2
Cwire interface. Table 2
illustrates FB pin voltage programming for the
AAT1231 and Table 3 illustrates FB pin voltage pro-
gramming for the AAT1231-1. The rising clock
edges applied at the EN/SET pin determine the FB
pin voltage. If a logic LOW is applied at the SEL pin,
the default feedback voltage range for the AAT1231
is 0.1V to 0.4V; for a logic HIGH condition at the
SEL pin, the default feedback voltage range is 0.3V
to 0.6V. Conversely, if a logic LOW is applied at the
SEL pin of the AAT1231-1, the default feedback
voltage range becomes 0.4V to 0.1V and 0.6V to
0.3V for a logic HIGH condition at the SEL pin.
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