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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 17/27頁 |
| 文件大小： | 1535K |
| 代理商： | AAT1231ITP-T1 |
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AAT1231/1231-1
Step-Up DC/DC Converters for
White LED Backlight Applications
1231.2007.01.1.2
17
Table 3: AAT1231-1 S
2
Cwire Reference Feedback Voltage Control Settings With R
BALLAST
= 30.1
Ω
(Assumes Nominal Values).
Rising Clock
Edges/Data
Register
SEL = Low
SEL = High
Reference
Voltage (V)
LED Current (mA);
R
BALLAST
= 30.1
Ω
13.29
12.62
11.96
11.30
10.63
9.97
9.30
8.64
7.97
7.31
6.64
5.98
5.32
4.65
3.99
3.32
Reference
Voltage (V)
LED Current (mA);
R
BALLAST
= 30.1
Ω
19.93
19.27
18.60
17.94
17.28
16.61
15.95
15.28
14.62
13.95
13.29
12.62
11.96
11.30
10.63
9.97
1
2
3
4
5
6
7
8
9
0.4 (default)
0.38
0.36
0.34
0.32
0.30
0.28
0.26
0.24
0.22
0.20
0.18
0.16
0.14
0.12
0.10
0.6 (default)
0.58
0.56
0.54
0.52
0.50
0.48
0.46
0.44
0.42
0.40
0.38
0.36
0.34
0.32
0.30
10
11
12
13
14
15
16
Selecting the Schottky Diode
To ensure minimum forward voltage drop and no
recovery, high voltage Schottky diodes are consid-
ered the best choice for the AAT1231/1231-1 boost
converters. The output diode is sized to maintain
acceptable efficiency and reasonable operating
junction temperature under full load operating con-
ditions. Forward voltage (V
F
) and package thermal
resistance (
θ
JA
) are the dominant factors to consid-
er in selecting a diode. The diode non-repetitive
peak forward surge current rating (I
FSM
) should be
considered for high pulsed load applications, such
as camera flash. I
FSM
rating drops with increasing
conduction period. Manufacturers’ datasheets
should be consulted to verify reliability under peak
loading conditions. The diode's published current
rating may not reflect actual operating conditions
and should be used only as a comparative meas-
ure between similarly rated devices.
20V rated Schottky diodes are recommended for out-
puts less than 15V, while 30V rated Schottky diodes
are recommended for outputs greater than 15V.
The switching period is divided between ON and
OFF time intervals.
During the ON time, the N-channel power MOSFET
is conducting and storing energy in the boost induc-
tor. During the OFF time, the N-channel power
MOSFET is not conducting. Stored energy is trans-
ferred from the input battery and boost inductor to
the output load through the output diode.
= T
ON
+ T
OFF
1
F
S
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