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SC2441ITSTRT датащи(PDF) 23 Page - Semtech Corporation

номер детали SC2441ITSTRT
подробное описание детали  Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter
PDF  35 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2441ITSTRT датащи(HTML) 23 Page - Semtech Corporation

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 2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC2441
sensed-current. In the SC2441 the compensation ramp
is made duty-ratio dependent. The compensation ramp
is approximately
.
A
8
.
4
*
De
I
D
1
.
1
ramp
µ
=
The incremental slope of such current ramp is then
.
A
8
.
4
*
f
e
)
D
1
.
1
1
(
S
s
D
1
.
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
m of 400µA/V. C2, C3 and R2 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
.
0
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
c to the converter output vo can be
derived from Figure 15.
,
s
s
1
s
s
1
kR
)
s
(
G
:
)
s
(
V
)
s
(
V
1
p
1
z
o
vc
c
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 vc) is
,
s
s
1
s
s
1
)
C
C
(
s
h
g
)
s
(
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).
Applications Information (Cont.)



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