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AN1330 Datasheet(PDF) 13 Page - STMicroelectronics

No. de pieza AN1330
Descripción Electrónicos  Designing with the L5970D 1A high efficiency DC-DC converter
PDF  31 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1330 Datasheet(HTML) 13 Page - STMicroelectronics

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AN1330
Closing the loop
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Figure 10.
Error amplifier equivalent circuit and compensation network
The poles of this transfer function are (if Cc >> C0+CP):
Equation 3
Equation 4
where 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.
4.2
LC filter
The transfer function of the L-C filter is given by:
Equation 6
where RLOAD is defined as the ratio between VOUT and IOUT.
If RLOAD>>ESR, the previous expression of ALC can be simplified and becomes:
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
1
ESR
C
OUT
s
•
•
+
()
•
s
2
LC
OUT
ESR
R
LOAD
+
() s
ESR
C
OUT
•
R
LOAD
L
+
•
() R
LOAD
+
•
+
•
•
•
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
=



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