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參數(shù)資料
型號: TPS40200MDREPG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
封裝: GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數(shù): 17/43頁
文件大小: 1069K
代理商: TPS40200MDREPG4
www.ti.com
Soft-Start Capacitor
3
SST
SS
10
4
.
1
V
ln
R
t
C
÷
è
-
=
(18)
SGLS371 – JANUARY 2007
The soft-start interval is given (in pF) by:
Where:
R = Internal 105-k
charging resistor
VCC = Input voltage up to 8 V, where the charging voltage is internally clamped to 8 V maximum
VOS = 700 mV and, because the input voltage is 12 V, VSST = 8 V
The oscilloscope output (see Figure 35) shows the expected delay at the output (middle trace) until the soft-start
node (bottom trace) reaches 700 mV. At this point, the output rises following the exponential rise of the soft-start
capacitor voltage until the soft-start capacitor reaches 1.4 V and the internal 700-mV reference takes over. This
total time is approximately 1 ms, which agrees with the calculated value of 0.95 ms where the soft-start
capacitance is 0.047
F.
A.
Channel 1 is the output voltage rising to 3.3 V.
B.
Channel 2 is the soft-start (SS) pin.
Figure 35. Soft Start Showing Output Delay and Controlled Rise to Programmed Output Voltage
24
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