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SC2441AEVB датащи(PDF) 34 Page - Semtech Corporation

номер детали SC2441AEVB
подробное описание детали  1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter
PDF  37 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2441AEVB датащи(HTML) 34 Page - Semtech Corporation

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34
 2006 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC2441A
P
2 is a pole for suppressing high-frequency switching
noise. So P
2 >> Z2. To simplify design, one usually assumes
that C
3<<C2, Roesr<<Ro, Sp1=Sz2 and specifies the loop
crossover frequency f
c. 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
p
=
2
o
o
2
C
C
R
R
=
and
.
R
C
R
C
2
o
oesr
3 =
For example, if V
in=3.3V, Vo=1.2V, Io=4A, fs=500kHz,
C
o=390µF, Roesr=16mΩ, one can calculate that
,
m
300
I
V
R
o
o
o
W
=
=
42
.
0
V
5
.
0
h
o
=
=
and
.
60
.
2
V
I
k
c
o
=
D
D
=
If the converter crossover frequency is set around 1/10
of the switching frequency, f
c=50kHz, the controller
parameters then can be calculated.
,
nF
326
.
0
f
2
hkR
g
C
c
o
m
2
»
p
=
use C
2=0.33nF.
,
k
5
.
354
C
C
R
R
2
o
o
2
W
»
=
use R
2=357kΩ.
It is further calculated that
,
pF
48
.
17
R
C
R
C
2
o
oesr
3
»
=
use C
3=22pF. The Bode plots of the loop transfer function
(magnitude and phase) are shown in Fig. 25.
Applications Information
function from the voltage error amplifier output v
c to
the converter output v
o can be derived from Figure 24.
,
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).



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