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参数资料
| 型号： | L6911ETR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | SO-20 |
| 文件页数： | 14/34页 |
| 文件大小： | 558K |
| 代理商： | L6911ETR |
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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
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
f
ingularity
ConverterS
=
=
=
=
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
C
Rd
d
f
C
R
f
C
R
f
C
R
f
ingularity
onNetworkS
Compensati
=
=
+
=
=
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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