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BST1 Datasheet(PDF) 28 Page - Fujitsu Component Limited. |
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BST1 Datasheet(HTML) 28 Page - Fujitsu Component Limited. |
28 / 56 page 28 MB39A214A Limitation : development tool vendor use only FUJITSU SEMICONDUCTOR CONFIDENTIAL DS405-00007-1v0-E Setting soft-start time Calculate the soft-start time by the following formula. ts = 7 105 CCS ts : Soft-start time [s] (time until output reaches 100%) CCS : CS pin capacitor value [F] Calculate the delay time until the soft-start activation by the following formula. td = 43 CVB td : VB voltage delay time (at VIN = 12 V) [s] CVB : VB pin capacitor value [F] When activating the other in the state where a side channel has already been activated (UVLO release: VB output already), the delay time is hardly generated. ts1 td ts2 EN1 EN2 VOUT1 VOUT2 |
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