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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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L5985 데이터시트(PDF) 18 Page - STMicroelectronics |
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L5985 데이터시트(HTML) 18 Page - STMicroelectronics |
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18 / 36 page  L5985 Application informations 18/36 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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