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L7987L датащи(PDF) 27 Page - STMicroelectronics

номер детали L7987L
подробное описание детали  Adjustable current limitation
PDF  41 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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L7987L датащи(HTML) 27 Page - STMicroelectronics

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L7987L
Application information
41
5.4.2
Type III compensation network
If FzESR is higher than the target loop bandwidth, as usually happens if the output filter is
based on MLCC ceramic capacitors, a type III compensation network must be designed.
Figure 13. Type III compensation network
The type III compensation network transfer function, from VOUT to COMP, is computed in
Equation 24.
Equation 24
In addition to what shown in Equation 21, two more singularities are proper of this
compensation network:
Equation 25








2
1
0
2
1
2
1
2
1
2
2
1
2
1
1
)
(
//
)
(
)
(
P
P
P
Z
Z
S
U
F
COMPIII
f
s
f
s
f
s
f
s
f
s
s
Z
R
s
Z
s
G
fZ2
1
2
 C
s
RU RS
+

-------------------------------------------------------;
=
fP2
1
2
 C
SRS
----------------------------
=



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