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SC4605IMSTRT датащи(PDF) 10 Page - Semtech Corporation

номер детали SC4605IMSTRT
подробное описание детали  Low Input, High Efficiency Synchronous, Step Down Controller
PDF  19 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4605IMSTRT датащи(HTML) 10 Page - Semtech Corporation

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 2004 Semtech Corp.
www.semtech.com
SC4605
POWER MANAGEMENT
C2
R1
C1
L1
C4
C9
R8
R7
R9
+VO
SC4605
VCC
2
ISET
3
COMP
4
FSET
5
BST
1
DRVH
10
DRVL
8
VSENSE
6
GND
7
PHASE
9
Figure 3. Compensation network provides 3
poles and 2 zeros.
For voltage mode step down applications as shown in
Figure 3, the power stage transfer function is:
4
1
2
1
4
C
I
VD
C
L
s
R
L
s
1
C
R
1
s
1
V
)
s
(
G
+
+
⋅
+
=
Where:
R = load resistance and
R
C = C4’s ESR.
The compensation network will have the characteristic
as follows:
2
P
2
Z
1
P
1
Z
I
COMP
s
1
s
1
s
1
s
1
s
)
s
(
G
ω
+
⋅
ω
+
⋅
ω
+
ω
+
⋅
ω
=
Where;
)
C
C
(
R
1
2
1
7
I
+
⋅
=
ω
2
1
1
Z
C
R
1
⋅
=
ω
9
8
7
2
Z
C
)
R
R
(
1
⋅
+
=
ω
2
1
1
2
1
1
P
C
C
R
C
C
⋅
⋅
+
=
ω
9
8
2
P
C
R
1
⋅
=
ω
After the compensation, the converter will have the
following loop gain:
LC
s
R
L
s
1
C
R
1
s
1
s
1
s
1
s
1
s
1
s
V
V
1
)
s
(
G
)
s
(
G
G
)
s
(
T
2
4
C
2
P
2
Z
1
P
1
Z
I
I
M
VD
COMP
PWM
+
+
⋅
+
⋅
ω
+
⋅
ω
+
⋅
ω
+
ω
+
⋅
⋅
ω
⋅
=
⋅
⋅
=
Where:
G
PWM = PWM gain
V
M = 1.5V, ramp peak to valley voltage of SC4605
Applications Information (Cont.)
Loop Compensation Design
For a DC/DC converter, it is usually required that the
converter has a loop gain of a high cross-over frequency
for fast load response, high DC and low frequency gain
for low steady state error, and enough phase margin for
its operating stability. Often one can not have all these
properties at the same time. The purpose of the loop
compensation is to arrange the poles and zeros of the
compensation network to meet the requirements for a
specific application.
The SC4605 has an internal error amplifier and requires
the compensation network to connect among the COMP
pin and VSENSE pin, GND, and the output as shown in
Figure 3. The compensation network includes C1, C2,
R1, R7, R8 and C9. R9 is used to program the output
voltage according to:
)
R
R
1
(
8
.
0
V
9
7
O
+
⋅
=



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