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LD3986J2830R-E 数据表(PDF) 9 Page - STMicroelectronics

部件名 LD3986J2830R-E
功能描述  DUAL ULTRA LOW DROP-LOW NOISE BICMOS VOLTAGE REG. FOR USE WITH VERY LOW ESR OUT. CAPACITORS
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

LD3986J2830R-E 数据表(HTML) 9 Page - STMicroelectronics

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LD3986 SERIES
9/12
source used to drive the EN input must be able to
swing above and below the specified turn-on/off
voltage
thresholds
listed
in
the
Electrical
Characteristics section under Enable Input Logic
Low and Enable Input Logic High.
Proper operation of the Enable function is
guaranteed by driving EN pins with TR and TF = 10
ms.
FAST ON-TIME
The LD3986 outputs are turned on after VREF
voltage reaches its final value (1.23V nominal). To
speed up this process, the noise reduction
capacitor at the bypass pin is charged with an
internal 70µA current source. The current source
is turned off when the bandgap voltage reaches
approximately 95% of its final value. The turn on
time is determined by the time constant of the
bypass capacitor. The smaller the capacitor value,
the shorter the turn on time, but less noise gets
reduced. As a result, turn on time and noise
reduction
need
to
be
taken
into
design
consideration when choosing the value of the
bypass capacitor.


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