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A7985ATR Folha de dados(PDF) 25 Page - STMicroelectronics

Nome de Peças A7985ATR
Descrição Electrónicos  2 A step-down switching regulator for automotive applications
PDF  44 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
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A7985ATR Folha de dados(HTML) 25 Page - STMicroelectronics

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A7985A
Application information
44
6.4.2
Type II compensation network
If the equivalent series resistance (ESR) of the output capacitor introduces a zero with
a frequency lower than the desired bandwidth (that is: 2
ESR COUT > 1 / BW), this zero
helps stabilize the loop. Electrolytic capacitors show not-negligible ESR (> 30 m
), so with
this kind of output capacitor the Type II network combined with the zero of the ESR allows
the stabilizing of the loop.
In Figure 13 the Type II network is shown.
Figure 13. Type II compensation network
The singularities of the network are:
Equation 30
fZ1
1
2
 R
4 C4

------------------------------
=
fP0 0
=
fP1
1
2
 R
4
C4 C5
C4 C5
+
--------------------

--------------------------------------------
=




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