參數(shù)資料
型號(hào)： SC2441
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(zhuǎn)換器控制器
文件頁(yè)數(shù)： 23/35頁(yè)
文件大?。?/td> 733K
代理商： SC2441
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(guān)PDF資料
PDF描述
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
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SC2441A 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
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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*