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參數(shù)資料
| 型號： | AAT1239-1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 40V Step-Up Converter for 4 to 10 White LEDs |
| 中文描述： | 40V的升壓轉(zhuǎn)換器為4至10個白光LED |
| 文件頁數(shù)： | 15/21頁 |
| 文件大?。?/td> | 915K |
| 代理商： | AAT1239-1 |
AAT1239-1
40V Step-Up Converter for 4 to 10 White LEDs
SwitchReg
TM
PRODUCT DATASHEET
1239-1.2007.10.1.0
15
w w w . a n a l o g i c t e c h . c o m
Selecting the Schottky Diode
To ensure minimum forward voltage drop and no recov-
ery, high voltage Schottky diodes are considered the
best choice for the AAT1239-1 boost converter. The out-
put diode is sized to maintain acceptable efficiency and
reasonable operating junction temperature under full
load operating conditions. Forward voltage (V
F
) and
package thermal resistance (
θ
JA
) are the dominant fac-
tors to consider 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 conduc-
tion period. Manufacturers’ datasheets should be con-
sulted 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 measure between similarly rated devices.
40V rated Schottky diodes are recommended for outputs
less than 30V, while 60V rated Schottky diodes are rec-
ommended for outputs greater than 35V.
The switching period is divided between ON and OFF
time intervals.
= T
ON
+ T
OFF
1
F
S
During the ON time, the N-channel power MOSFET is
conducting and storing energy in the boost inductor.
During the OFF time, the N-channel power MOSFET is
not conducting. Stored energy is transferred from the
input battery and boost inductor to the output load
through the output diode.
Duty cycle is defined as the ON time divided by the total
switching interval.
T
ON
T
ON
+ T
OFF
D =
= T
ON
F
S
Rising Clock
Edges/Data
Register
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SEL = Low
SEL = High
Reference
Voltage (V)
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
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)
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
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
Table 2: AAT1239-1 S
2
Cwire Reference Feedback Voltage Control Settings With R
BALLAST
= 30.1
Ω
(Assumes Nominal Values)*.
*All table entries are preliminary and subject to change without notice.
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相關(guān)代理商/技術(shù)參數(shù) |
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| AAT1239-1_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:40V Step-Up Converter for 4 to 10 White LEDs |
| AAT1239-1_0810 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:40V Step-Up Converter for 4 to 10 White LEDs |
| AAT1239ITP-1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:40V Step-Up Converter for 4 to 10 White LEDs |
| aat1239itp-1-db1 | 制造商:Skyworks Solutions Inc 功能描述:AAT1239 Series 40 V Step-Up Converter for 4 to 10 White LEDs Eval Board |
| AAT1239ITP-1-T1 | 制造商:Skyworks Solutions Inc 功能描述:STEP UP CONVERTER 40V FOR WLED 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
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