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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L5986 датащи(PDF) 23 Page - STMicroelectronics |
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L5986 датащи(HTML) 23 Page - STMicroelectronics |
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23 / 39 page  L5986 - L5986A Application information 23/39 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 stabilizing the loop. In Figure 12 the type II network is shown. Figure 12. Type II compensation network The singularities of the network are: In Figure 13 the bode diagram of the PWM and LC filter transfer function (GPW0 · GLC(f)) and the open loop gain (GLOOP(f) = GPW0 · GLC(f) · GTYPEII(f)) are drawn. f Z1 1 2 π R 4 C 4 ⋅⋅ ------------------------------ = f P0 0 = f P1 1 2 π R 4 C 4 C 5 ⋅ C 4 C 5 + -------------------- ⋅⋅ -------------------------------------------- = ,, |
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