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A7985ATR Datasheet(PDF) 25 Page - STMicroelectronics

No. de pieza A7985ATR
Descripción Electrónicos  2 A step-down switching regulator for automotive applications
PDF  44 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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A7985ATR Datasheet(HTML) 25 Page - STMicroelectronics

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DocID023128 Rev 5
25/44
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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