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L6986H 数据表(PDF) 17 Page - STMicroelectronics |
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L6986H 数据表(HTML) 17 Page - STMicroelectronics |
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17 / 68 page  4.3.1 Ratiometric startup The ratiometric start-up is implemented sharing the same soft-start capacitor for a set of the L6986H devices Figure 10. Ratiometric startup VOUT3 VOUT2 VOUT1 t V As a consequence all the internal current generators charge in parallel the external capacitor. The capacitor value is dimensioned accordingly, as per equation below: CSS=nL6986H⋅SSGAIN⋅ISSCH⋅TSS VFB =nL6986H⋅3⋅4μA⋅TSS 0.85V (12) where nL6986H 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. Figure 11. Ratiometric start-up operation L6986H Soft-start and inhibit DS12905 - Rev 2 page 17/68 |
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