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L6986 数据表(PDF) 21 Page - STMicroelectronics |
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L6986 数据表(HTML) 21 Page - STMicroelectronics |
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21 / 68 page  DocID025376 Rev 7 21/68 L6986 Functional description 68 4.3.1 Ratiometric startup The ratiometric startup is implemented sharing the same soft-start capacitor for a set of the L6986 device. 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 nL6986 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 nL6986 SSGAIN ISSCH T SS VFB -------------------------------- nL6986 3 4 AT SS 0.85V --------------------------- == |
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