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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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L5985 Arkusz danych(PDF) 18 Page - STMicroelectronics |
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L5985 Arkusz danych(HTML) 18 Page - STMicroelectronics |
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18 / 37 page  L5985 Application information 18/37 The transfer function on the LC filter is given by: Equation 13 where: Equation 14 Equation 15 As seen in Chapter 4.3 two different kind of network can compensate the loop. In the two following paragraph the guidelines to select the Type II and Type III compensation network are illustrated. Figure 9. Error amplifier, PWM modulator and LC output filter G LC s () 1 s 2 π f zESR ⋅ -------------------------- + 1 s 2 π Qf ⋅ LC ⋅ ---------------------------- s 2 π f LC ⋅ ------------------- ⎝⎠ ⎛⎞ 2 ++ ------------------------------------------------------------------------- = f LC 1 2 π LC OUT ⋅ 1 ESR R OUT --------------- + ⋅⋅ ------------------------------------------------------------------------ = f zESR 1 2 π ESR C OUT ⋅⋅ -------------------------------------------- = , Q R OUT LC OUT R OUT ESR + () ⋅⋅ ⋅ LC OUT R OUT ESR ⋅⋅ + ------------------------------------------------------------------------------------------ R OUT V OUT I OUT -------------- = , = FB COMP V REF E/A PWM V S OUT V CC C OUT ESR L G PW0 G LC FB COMP V REF E/A PWM V S OUT V CC C OUT ESR L G PW0 G LC |
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