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參數(shù)資料
| 型號： | SC2441A |
| 廠商： | Semtech Corporation |
| 英文描述： | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| 中文描述： | 1.8V至20V的輸入2相同步降壓與升壓轉(zhuǎn)換器控制器 |
| 文件頁數(shù)： | 34/37頁 |
| 文件大?。?/td> | 1024K |
| 代理商： | SC2441A |
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34
2006 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
Applications Information
SC2441A
P
is a pole for suppressing high-frequency switching
noise. So P
2
>> Z
2
. To simplify design, one usually assumes
that C
<<C
, R
<<R
o,
S
=S
and specifies the loop
crossover frequency f
. The loop crossover frequency
determines the converter dynamic response. With these
assumptions, the controller parameters are determined
as follows
,
f
2
hkR
g
C
c
o
m
2
2
o
o
2
C
C
R
R
and
.
R
C
R
C
2
o
oesr
3
For example, if V
=3.3V, V
=1.2V, I
=4A, f
=500kHz,
C
o
=390
μ
F, R
oesr
=16m
, one can calculate that
,
m
300
I
V
R
o
o
o
42
.
V
5
h
o
and
.
60
.
V
I
k
c
o
If the converter crossover frequency is set around 1/10
of the switching frequency, f
=50kHz, the controller
parameters then can be calculated.
,
nF
326
.
f
2
hkR
g
C
c
o
m
2
use C
2
=0.33
n
F.
,
k
5
354
C
C
R
R
2
o
o
2
use R
=357k
.
It is further calculated that
,
pF
48
.
17
R
C
R
C
2
o
oesr
3
use C
=22pF. The Bode plots of the loop transfer function
(magnitude and phase) are shown in Fig. 25.
function from the voltage error amplifier output v
to
the converter output v
o
can be derived from Figure 24.
,
s
s
1
s
s
1
kR
)
vc
G
:
)
c
V
)
o
V
1
p
1
z
o
where the single dominant-pole is
o
oesr
o
1
p
C
)
R
R
(
1
s
and the zero associated with the output capacitor ESR
is
.
C
R
1
s
o
oesr
1
z
The dominant-pole changes with the converter output
load.
The controller transfer function (from the converter
output
v
o
to the voltage error amplifier output
v
c
) is
,
s
s
1
s
s
1
)
C
C
(
h
g
)
C
2
p
2
z
3
2
m
where
2
2
2
z
C
R
1
s
and
.
C
C
C
C
R
1
s
3
2
3
2
2
2
p
The loop transfer function is then
T(s)=G
vc
(s)C(s).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC2441AEVB | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ATETRT | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441 | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441EVB | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ITSTRT | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC2441A_09 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441AEVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ATETRT | 制造商:Semtech Corporation 功能描述: |
| SC2441EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ITSTRT | 制造商:Semtech Corporation 功能描述:Controller IC |
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