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XC9201

Series

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Functional 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 1.55V rising from 0V. Soft start time is approximated by the equation below

T=-Css x Rss x ln((Vcont-1.55)/Vcont)

Example: When Css=0.1μF, Rss=470kΩ, and Vcont=5V, T= - 0.1 x 10

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)

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OPERATIONAL EXPLANATION (Continued)