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AN1518 Datasheet(PDF) 12 Page - STMicroelectronics

Part # AN1518
Description  The L5973D is a step-down monolithic power switching regulator capable
PDF  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1518 Datasheet(HTML) 12 Page - STMicroelectronics

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LC filter
AN1518
12/30
Figure 10.
Error amplifier equivalent circuit and compensation network
The poles of this transfer function are (if Cc >> C0+CP):
Equation 3
Equation 4
whereas the zero is defined as:
Equation 5
FP1 is the low frequency which sets the bandwidth, while the zero FZ1 is usually put near to
the frequency of the double pole of the L-C filter (see below). FP2 is usually at a very high
frequency.
7
LC filter
The transfer function of the L-C filter is given by:
Equation 6
F
P1
1
2
π
•
R
0
•
C
c
•
---------------------------------------
=
F
P2
1
2
π
•
R
c
•
C
0
C
p
+
()
•
---------------------------------------------------------
=
F
Z1
1
2
π
•
R
c
•
C
c
•
---------------------------------------
=
A
LC s
()
R
LOAD
1ESR
C
OUT
s
•
•
+
()
•
s
2
LC
OUT
ESR
R
LOAD
+
() sESR C
OUT
•
R
LOAD
L
+
•
() R
LOAD
+
•
+
•
•
•
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
=



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