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A7986ATR Folha de dados(PDF) 23 Page - STMicroelectronics

Nome de Peças A7986ATR
Descrição Electrónicos  3 A step-down switching regulator for automotive applications
PDF  42 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
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A7986ATR Folha de dados(HTML) 23 Page - STMicroelectronics

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A7986A
Application information
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
π∗ESR∗COUT>1/BW), this zero helps
stabilize the loop. Electrolytic capacitors show not negligible ESR (>30 m
Ω), so with this
kind of output capacitor the Type II network combined with the zero of the ESR allows the
stabilization of the loop.
In Figure 13, the Type II network is shown.



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