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数据搜索系统，热门电子元器件搜索 |
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A6985F 数据表(PDF) 22 Page - STMicroelectronics |
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A6985F 数据表(HTML) 22 Page - STMicroelectronics |
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22 / 77 page  Functional description A6985F 22/77 DocID027738 Rev 2 5.3.1 Ratiometric startup The ratiometric startup is implemented sharing the same soft-start capacitor for a set of the A6985F 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 n A6985Frepresents 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 nA6985F SSGAIN ISSCH T SS VFB -------------------------------- nA6985F 3 4 AT SS 0.85V --------------------------- == |
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