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L7987L датащи(PDF) 27 Page - STMicroelectronics |
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L7987L датащи(HTML) 27 Page - STMicroelectronics |
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27 / 41 page ![]() DocID026362 Rev 3 27/41 L7987L Application information 41 5.4.2 Type III compensation network If FzESR is higher than the target loop bandwidth, as usually happens if the output filter is based on MLCC ceramic capacitors, a type III compensation network must be designed. Figure 13. Type III compensation network The type III compensation network transfer function, from VOUT to COMP, is computed in Equation 24. Equation 24 In addition to what shown in Equation 21, two more singularities are proper of this compensation network: Equation 25 2 1 0 2 1 2 1 2 1 2 2 1 2 1 1 ) ( // ) ( ) ( P P P Z Z S U F COMPIII f s f s f s f s f s s Z R s Z s G fZ2 1 2 C s RU RS + -------------------------------------------------------; = fP2 1 2 C SRS ---------------------------- = |
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