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MLP2012S 데이터시트(PDF) 11 Page - Seiko Instruments Inc

부품명 MLP2012S
상세설명  STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM / PFM SWITCHABLE SWITCHING REGULATOR
PDF  50 Pages
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제조업체  SII [Seiko Instruments Inc]
홈페이지  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

MLP2012S 데이터시트(HTML) 11 Page - Seiko Instruments Inc

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STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM/PFM SWITCHABLE SWITCHING REGULATOR
Rev.2.0_01
S-8363 Series
11
3. Soft-start function
The S-8363 Series has the built-in soft-start circuit. When power-on (connecting
OFF
/
ON
to VIN) or after
start-up at
OFF
/
ON
= “H”, the output voltage (VOUT) gradually rises, suppressing rush current and overshoot of
the output voltage. In the S-8363 Series, the soft-start time (tss) is from start-up to the time to reach 90% of the
VOUT output voltage setting value (VOUT(S)). A reference voltage adjustment method is adopted as the soft-start
method, the reference voltage gradually rises from 0 V simultaneously with start of the soft-start. The soft-start
circuit has two operation modes which is selected according to the VOUT voltage at start-up.
3.1 VOUT voltage at start-up
> STU release voltage
The soft-start starts when the reference voltage gradually rises after
OFF
/
ON
= “H”.
Reference voltage
from
error amplifier
Soft-start time (tss)
Time [s]
0 V
0 V
VOUT
× 0.90
0 V
Output voltage
(VOUT)
Input voltage
(VIN)
Soft-start period
ON/OFF
voltage
STU release
0 V
Figure 10



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