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參數(shù)資料
| 型號： | AAT1152IKS-1.0-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 850kHz 1A Synchronous Buck DC/DC Converter |
| 中文描述： | 850kHz 1A條同步降壓DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 12/18頁 |
| 文件大?。?/td> | 335K |
| 代理商： | AAT1152IKS-1.0-T1 |
AAT1152
850kHz 1A Synchronous Buck DC/DC Converter
12
1152.2003.01.0.9
Output Capacitor
Since there are no external compensation compo-
nents, the output capacitor has a strong effect on
loop stability. Larger output capacitance will reduce
the crossover frequency with greater phase mar-
gin. For the 1.5V 1A design using the 4.1 μH induc-
tor, a 47μF capacitor provides a stable loop with 35
degrees of phase margin at a crossover frequency
of 100 kHz. Doubling the capacitance to 100μF
reduces the crossover frequency to half while
increasing the phase margin to 60 degrees. In
addition to assisting stability, the output capacitor
limits the output ripple and provides holdup during
large load transitions. A 100μF X5R or X7R ceram-
ic capacitor provides sufficient bulk capacitance to
stabilize the output during large load transitions
and has ESR and ESL characteristics necessary
for low output ripple. The output capacitor rms rip-
ple current is given by:
For a ceramic capacitor the dissipation due to the
RMS current of the capacitor is not a concern.
Tantalum capacitors, with sufficiently low ESR to
meet output voltage ripple requirements, also have
an RMS current rating much greater than that
actually seen in this application.
(V
OUT
+ V
FWD
)
(V
IN
- V
OUT
)
L
F
V
IN
1
I
RMS
=
2
3
Figure 3: 3.3V to 1.25V converter
L1
2.7
μ
H
C2
100
μ
F
C1
10
μ
F
R1 100
C3
0.1
μ
F
C1 Murata 10
μ
F 6.3V X5R GRM42-6X 5R106K6.3
C2 MuRata 100
μ
F 6.3V GRM43-2 X5R 107M 100
μ
F 6.3V
L1 Sumida CDRH4D28-2R 7
μ
H
R2
100k
Vo+ 1.25V1A
Vin+ 3.3V
V-
FB
Sgnd
EN
Vcc
Vp
LX
Pok
Pgnd
U1
AAT1152-1.0
R5
R3
R4
10k 1%
LX
Pok
EN
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| AAT1152IKS-2.0-T1 | 850kHz 1A Synchronous Buck DC/DC Converter |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1152IKS-2.0-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:850kHz 1A Synchronous Buck DC/DC Converter |
| AAT1152IKS-2.5-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:850kHz 1A Synchronous Buck DC/DC Converter |
| AAT1152IKS-3.0-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:850kHz 1A Synchronous Buck DC/DC Converter |
| AAT1152IKS-3.3-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:850kHz 1A Synchronous Buck DC/DC Converter |
| AAT1153 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:2A Step-Down Converter |
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