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XC9101D30AKL Datasheet(PDF) 11 Page - Torex Semiconductor |
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XC9101D30AKL Datasheet(HTML) 11 Page - Torex Semiconductor |
11 / 19 page GFunctional Settings 1. Soft Start CE and soft start (SS) functions are commonly assigned to the CE/SS pin. The soft start function is effective until the voltage at the CE pin reaches approximately 1.55 V rising from 0 V. Soft start time is approximated by the equation below according to values of Vcont, Rss, and Css. T = -Css × Rss × ln((Vcont - 1.55)/Vcont) Example: When CSS = 0.1 µF, RSS = 470 kΩ, and Vcont = 5 V, T = -0.1 e-6 × 470 e3 × ln ((5 - 1.55)/5) = 17.44 ms. Set the soft start time to a value sufficiently longer than the period of a clock pulse. > Circuit example 1: N-ch open drain > Circuit example 2: CMOS logic (low current dissipation) > Circuit example 3: CMOS logic (low current dissipation), quick off CE/SS pin [Inside the IC] Vcont Css CE, UVLO Vref circuit To Verr amplifier Rss CE/SS pin [Inside the IC] Css Rss ON/OFF signal Vcont CE/SS pin [Inside the IC] Css Rss ON/OFF signal Vcont CE/SS pin [Inside the IC] Css Rss ON/OFF signal Vcont XC9101 Series 397 4 04S_01XC9101/9102新規 02.09.12 14:38 ページ 397 |
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