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L6911ETR датащи(PDF) 21 Page - STMicroelectronics

номер детали L6911ETR
подробное описание детали  5-Bit programmable step down controller with synchronous rectification
PDF  34 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6911ETR датащи(HTML) 21 Page - STMicroelectronics

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L6911E
Device description
21/34
To choose the other components of the compensation network, the transfer function of the
voltage loop is considered. To simplify the analysis is supposed that R3 << Rd,
where Rd = (R8//R9).
Figure 10. Compensation network definition
The transfer function may be evaluated neglecting the connection of R8 to PHASE because,
as will see later, this connection is important only at low frequencies. So R4 is considered
connected to VOUT. Under this assumption, the voltage loop has the following transfer
function:
Equation 17
Where ZC(s) and ZL(s) are the output capacitor and inductor impedance respectively.
The expression of ZI(s) may be simplified as follow:
|A v |
|R |
|G lo o p |
f
f
f
fc
fD
f2
f1
f3
R 0
2
fLC
fCE
fEC
fCC
G 0
acitor
CeramicCap
Cceramic
Rceramic
CC
f
by
Introduced
Cceramic
ESR
EC
f
ESRzero
OUT
C
ESR
CE
f
doublepole
LC
LC
f
ingularity
ConverterS
⋅
⋅
=
⋅
⋅
=
⋅
⋅
=
⋅
=
π
π
π
π
2
/
1
2
/
1
2
/
1
2
/
1
25
2
/
1
25
3
2
/
1
3
20
)
4
3
(
2
/
1
2
20
4
2
/
1
1
C
Rd
d
f
C
R
f
C
R
R
f
C
R
f
ingularity
onNetworkS
Compensati
⋅
⋅
=
⋅
⋅
=
⋅
+
⋅
=
⋅
⋅
=
π
π
π
π
Gloop s
()
Av s
() Rs
()
⋅
Av s
() Zf s
()
Zi s
()
-------------
⋅
==
where
Av s
()
Vin
V
osc
∆
---------------
Z
C s
()
Z
C s
() Z
L s
()
+
------------------------------------
⋅
=



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