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A5975D Datasheet(PDF) 20 Page - STMicroelectronics

Part # A5975D
Description  Voltage feed-forward
PDF  50 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A5975D Datasheet(HTML) 20 Page - STMicroelectronics

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Closing the loop
A5975D
20/50
Doc ID 018760 Rev 1
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 LC filter (see below). FP2 is usually at a very high
frequency.
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
⋅⋅
⋅
---------------------------------
=



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