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R7986A Datenblatt(PDF) 23 Page - STMicroelectronics

Teilenummer R7986A
Bauteilbeschribung  3 A step-down switching regulator for aerospace applications
PDF  37 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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R7986A Datenblatt(HTML) 23 Page - STMicroelectronics

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R7986A
Application information
37
Figure 12. Open loop gain Bode diagram with ceramic output capacitor
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 stabilization of the loop.



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