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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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A7985ATR 데이터시트(PDF) 25 Page - STMicroelectronics |
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A7985ATR 데이터시트(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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