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数据搜索系统，热门电子元器件搜索 |
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L6985F 数据表(PDF) 20 Page - STMicroelectronics |
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L6985F 数据表(HTML) 20 Page - STMicroelectronics |
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20 / 65 page  Functional description L6985F 20/65 DocID027836 Rev 2 4.3.1 Ratiometric startup The ratiometric startup is implemented sharing the same soft-start capacitor for a set of the L6985F devices. Figure 10. Ratiometric startup As a consequence all the internal current generators charge in parallel the external capacitor. The capacitor value is dimensioned accordingly with Equation 12: Equation 12 where nL6985F represents the number of devices connected in parallel. For better tracking of the different output voltages the synchronization of the set of regulators is suggested. CSS nL6985F SSGAIN ISSCH T SS VFB -------------------------------- nL6985F 3 4 AT SS 0.85V --------------------------- == |
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