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A7986ATR Datasheet(PDF) 23 Page - STMicroelectronics

Part # A7986ATR
Description  3 A step-down switching regulator for automotive applications
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A7986ATR Datasheet(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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