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L5985TR Datasheet(PDF) 22 Page - STMicroelectronics

Part # L5985TR
Description  2 A step-down switching regulator
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5985TR Datasheet(HTML) 22 Page - STMicroelectronics

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L5985
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Figure 12.
Open loop gain bode diagram with ceramic output capacitor
5.4.2
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 * C
OUT > 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
stabilizing the loop.
In Figure 13 the type II network is shown.



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