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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L7985 датащи(PDF) 23 Page - STMicroelectronics |
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L7985 датащи(HTML) 23 Page - STMicroelectronics |
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23 / 42 page  DocID022446 Rev 7 23/42 L7985 Application information 42 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 non-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. In Figure 13 the type II network is shown. Figure 13. Type II compensation network The singularities of the network are: Equation 28 fZ1 1 2 R 4 C4 ------------------------------ = fP0 0 = fP1 1 2 R 4 C4 C5 C4 C5 + -------------------- -------------------------------------------- = |
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