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參數(shù)資料
| 型號(hào)： | AAT1231ITP-1-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)： | 15/27頁(yè) |
| 文件大?。?/td> | 1535K |
| 代理商： | AAT1231ITP-1-T1 |
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Figure 6: Programming AAT1231-1 LED
Current with R
BALLAST
= 30.1
Ω
.
Alternatively, toggling the SEL logic pin from low to
high implements stepped or pulsed LED currents by
increasing the FB pin voltage. Figures 7 and 8 illus-
trate the SELECT pin scaling factor, defined as the
LED current with SEL=HIGH divided by the LED
current with SEL=LOW. For the AAT1231, scaling
factors from 1.5x to 3.0x are possible, depending on
the S
2
Cwire data register (default = 3.0x). In the
AAT1231-1, the possible scaling factors are 3.0x to
1.5x with the internal default setting of 1.5x.
Figure 7: AAT1231 SEL Pin Scaling Factor:
I
LED
(SEL = High) Divided by I
LED
(SEL = Low).
Figure 8: AAT1231-1 SEL Pin Scaling Factor:
I
LED
(SEL = High) Divided by I
LED
(SEL = Low).
S
2
Cwire Serial Interface
AnalogicTech's S
2
Cwire single wire serial interface
is a proprietary high-speed single-wire interface
available only from AnalogicTech. The S
2
Cwire
interface records rising edges of the EN/SET input
and decodes them into 16 individual states. Each
state corresponds to a reference feedback voltage
setting on the FB pin, as shown in Table 2.
S
2
Cwire Serial Interface Timing
The S
2
Cwire single wire serial interface data can be
clocked-in at speeds up to 1MHz. After data has
been submitted, EN/SET is held high to latch the
data for a period T
LAT
. The FB pin voltage is subse-
quently changed to the level as defined by the state
of the SEL logic pin. When EN/SET is set low for a
time greater than T
OFF
, the AAT1231/1231-1 is dis-
abled. When either the AAT1231 or the AAT1231-1
is disabled, the register is reset to its default value.
In the AAT1231, the default register value sets the
FB pin voltage to 0.6V if the EN/SET pin is subse-
quently pulled HIGH. In the AAT1231-1, the FB pin
voltage is set to 0.3V under the same condition.
S
2
Cwire Data Register
S
(
(Default)
1.0
1.5
2.0
2.5
3.0
3.5
1
4
7
10
13
16
1.0
1.5
2.0
2.5
3.0
3.5
1
4
7
10
13
16
S
2
Cwire Data Register
S
(
(Default)
S
2
Cwire Data Register
L
0
5
10
15
20
25
1
4
7
10
13
16
SEL=LOW
SEL=HIGH
(Default)
AAT1231/1231-1
Step-Up DC/DC Converters for
White LED Backlight Applications
1231.2007.01.1.2
15
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