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參數(shù)資料
| 型號(hào)： | XC9101C50AKR |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 10/21頁 |
| 文件大?。?/td> | 156K |
| 代理商： | XC9101C50AKR |
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.
Example:
Set the soft start time to a value sufficiently longer than the period of a clock pulse.
> Circuit example 1: Nch open drain
> Circuit example 2: CMOS logic (low current dissipation)
> Circuit example 3: CMOS logic (low current dissipation), quick off
10
XC9101/02 Series
PWM Controlled, PWM//PFM Switchable Step-Up DC/DC Converters
T = -Css x Rss x ln((Vcont - 1.55)/Vcont)
When Css = 0.1
μ
F, Rss = 470 k
, and Vcont = 5 V, T = -0.1 e
-6
x 470 e
3
x ln ((5 - 1.55)/5) = 17.44
ms.
CE/SS pin
[Inside IC, XC9101/02]
Vcont
Rss
Css
CE,
UVLO
Vref
circuit
To Verr amplifier
[Inside IC, XC9101/02]
CE/SS pin
ON/OFF signal
Rss
Css
Vcont
ON/OFF signal
CE/SS pin
[Inside IC, XC9101/02]
Rss
Css
Vcont
ON/OFF signal
CE/SS pin
[Inside IC, XC9101/02]
Rss
Css
Vcont
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