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SC2620 датащи(PDF) 19 Page - Semtech Corporation

номер детали SC2620
подробное описание детали  Dual 2A, 30V Step-down Regulator with Programmable Frequency up to 1.4MHz
PDF  26 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC2620 датащи(HTML) 19 Page - Semtech Corporation

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 2006 Semtech Corp.
www.semtech.com
SC2620
POWER MANAGEMENT
Applications Information
This is also equal to


+
2
1
2
5
MA
OUT
MP
R
R
R
R
G
R
G
. Therefore
n
10
R
C
R
R
R
R
G
R
G
OUT
1
S
2
1
2
5
MA
OUT
MP
ω
=


+
.
Re-arranging,
MA
MP
1
S
2
1
5
G
nG
10
C
R
R
1
R
ω


+
=
(11)
ω
z1 is shown to be less than ωp2 in Figure 12. Making
60
6
S
C
1
z
ω
=
ω
=
ω
gives a first-order estimate of C
5:
5
S
5
R
60
C
ω
≈
(12)
Notice that R
5 determines the mid-band loop gain of the
converter. Increasing R
5 increases the mid-band gain and
the crossover frequency. However it reduces the phase
margin. C
6 is a small ceramic capacitor to roll off the loop
Bode Plots of Control-to-Ouput, Output-to-Control and the Overall Loop Gain.
Control-to-output transfer function is shown with two poles near half the
switching frequency
ω
S.
Figure 12.
2
p
ω
1
OUT C
R
n
5
OC
R
1
1
p
ω
3
p
ω
6
5 C
R
1
5
5 C
R
1
1
Z
ω
C
ω
ω
Gain
2
S
ω
OUT
MPR
G


+
2
1
2
O
MA
R
R
R
R
G


+
2
1
2
5
MA
R
R
R
R
G
n
R
C
OUT
1
C
ω
)
j
(
T
ω
OUT
COMP
v
v
Control-to-Output
Transfer Function



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