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參數資料
| 型號： | SC2441EVB |
| 廠商： | Semtech Corporation |
| 英文描述： | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| 中文描述： | 非常低的輸入電壓2相同步降壓與升壓轉換器控制器 |
| 文件頁數： | 23/35頁 |
| 文件大?。?/td> | 733K |
| 代理商： | SC2441EVB |
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23
2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
Applications Information (Cont.)
SC2441
sensed-current. In the SC2441 the compensation ramp
is made duty-ratio dependent. The compensation ramp
is approximately
.
A
8
*
De
I
D
1
ramp
μ
=
The incremental slope of such current ramp is then
.
A
8
*
f
e
D
1
+
1
S
s
D
1
e
μ
=
Once the inner current loop is stabilized, the output voltage
is then regulated with the outer voltage feedback loop. An
equivalent circuit of current-mode Buck converter is shown
in Figure 15.
k
Figure 15. A simple model of current-mode buck converter
The voltage transconductance error amplifier (in the
SC2441) has a g
of 400
μ
A/V. C
, C
and R
of the
compensation network are to be determined for stable
operation with optimized load transient response.
The feedback gain h and the resistor values are determined
using the equations given in the
“Setting the Output
Voltage”
section with
.
V
5
h
o
=
For the rated output current I
o
, the first-order gain k is
determined as
.
V
I
k
c
o
=
Furthermore the transfer function from the voltage error
amplifier output v
to the converter output v
o
can be
derived from Figure 15.
,
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PDF資料 |
PDF描述 |
|---|---|
| SC2441ITSTRT | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2442 | High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2442H | High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2442HITSTR | High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2442HITSTRT | High Performance Wide Input Range Dual Synchronous Buck Controller |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SC2441ITSTRT | 制造商:Semtech Corporation 功能描述:Controller IC |
| SC2442 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2442H | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2442HITSTR | 制造商:Semtech Corporation 功能描述: |
| SC2442HITSTRT | 制造商:Semtech Corporation 功能描述:Controller IC |
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