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L5980 数据表(PDF) 20 Page - STMicroelectronics |
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L5980 数据表(HTML) 20 Page - STMicroelectronics |
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20 / 37 page  Application informations L5980 20/37 Figure 11. Open loop gain: module Bode diagram The guidelines for positioning the poles and the zeroes and for calculating the component values can be summarized as follow: 1. Choose a value for R1, usually between 1kΩ and 5kΩ. 2. Choose a gain (R4/R1) in order to have the required bandwidth (BW), that means: Equation 18 where K is the feed forward constant and 1/K is equals to 9. 3. Calculate C4 by placing the zero at 50% of the output filter double pole frequency (fLC): Equation 19 4. Calculate C5 by placing the second pole at four times the system bandwidth (BW): Equation 20 5. Set also the first pole at four times the system bandwidth and also the second zero at the output filter double pole: R 4 BW f LC ---------- 1 K ---- R 1 ⋅⋅ = C 4 1 π R 4 f LC ⋅⋅ --------------------------- = C 5 C 4 2 π R 4 C 4 4BW ⋅ 1 – ⋅⋅⋅ -------------------------------------------------------------- = |
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