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L6985F Datasheet(PDF) 38 Page - STMicroelectronics

Part # L6985F
Description  Internal current limiting
PDF  65 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6985F Datasheet(HTML) 38 Page - STMicroelectronics

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DocID027836 Rev 2
5.2
Error amplifier compensation network
The typical compensation network required to stabilize the system is shown in Figure 28.
Figure 28. 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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