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L7987 Datasheet(PDF) 27 Page - STMicroelectronics

Part # L7987
Description  Adjustable current limitation
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7987 Datasheet(HTML) 27 Page - STMicroelectronics

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DocID025589 Rev 3
27/37
L7987
Application information
37
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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