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A6986F Arkusz danych(PDF) 39 Page - STMicroelectronics

Numer części A6986F
Szczegółowy opis  38 V 1.5 A synchronous step-down switching regulator
PDF  72 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
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A6986F Arkusz danych(HTML) 39 Page - STMicroelectronics

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A6986F
Closing the loop
72
6.2
Error amplifier compensation network
The typical compensation network required to stabilize the system is shown in Figure 30.
Figure 30. Transconductance embedded error amplifier
RC and CC introduce a pole and a zero in the open loop gain. CP does not significantly affect
system stability but it is useful to reduce the noise at the output of the error amplifier.
The transfer function of the error amplifier and its compensation network is:
Equation 24
Where Avo = Gm · Ro
The poles of this transfer function are (if Cc >> C0 + CP):
Equation 25
A0 s

AV0 1s Rc Cc
+

s
2
R0 C0 Cp
+

Rc Cc sR0 Cc R0 C0 Cp
+

+
Rc Cc
+
 1
+
+
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
=
fPLF
1
2
 R
0
Cc
-------------------------------------
=



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