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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 1.55 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 C
SS
= 0.1
μ
F, R
SS
= 470 k
, and Vcont = 5 V, T = -0.1 e
-6
×
470 e
3
×
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
397
4
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| XC9101CC9AKL | 制造商:TOREX 制造商全稱(chēng):Torex Semiconductor 功能描述:PWM Controlled Step-Up DC/DC Controllers |
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| XC9101CD3AKL | 制造商:TOREX 制造商全稱(chēng):Torex Semiconductor 功能描述:PWM Controlled Step-Up DC/DC Controllers |
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