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XC9101D30AKL Datasheet(PDF) 11 Page - Torex Semiconductor

Part # XC9101D30AKL
Description  PWM Controlled Step-Up DC/DC Controllers
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Manufacturer  TOREX [Torex Semiconductor]
Direct Link  http://www.torex.co.jp
Logo TOREX - Torex Semiconductor

XC9101D30AKL Datasheet(HTML) 11 Page - Torex Semiconductor

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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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