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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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A7985ATR Fiches technique(PDF) 25 Page - STMicroelectronics |
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A7985ATR Fiches technique(HTML) 25 Page - STMicroelectronics |
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25 / 44 page  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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