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XC9101 Datasheet(PDF) 10 Page - Torex Semiconductor

Part # XC9101
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

XC9101 Datasheet(HTML) 10 Page - Torex Semiconductor

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XC9101 Series
OPERATIONAL EXPLANATION (Continued)
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 CSS = 0.1 μF, RSS = 470 kΩ, and Vcont = 5 V,
T = -0.1 x 10
-6 × 470 x 103 × ln ((5 - 1.55) / 5) = 17.44 ms.
CE/SS pin
Vcont
Css
CE,
UVLO
Vref
circuit
To Verr amplifier
Rss
Set the soft start time to a value sufficiently longer than the period of a clock pulse.
> Circuit example 1: N-ch open drain
CE/SS pin
Css
Rss
ON/OFF signal
Vcont
> Circuit example 2: CMOS logic (low supply current)
CE/SS pin
Css
Rss
ON/OFF signal
Vcont
> Circuit example 3: CMOS logic (low supply current), quick off
CE/SS pin
Css
Rss
ON/OFF signal
Vcont


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