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UC19431 Datasheet

  • UC19431

  • Precision Adjustable Shunt Regulator

  • 7頁

  • TI

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Precision Adjustable Shunt Regulator
FEATURES
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Multiple On-Chip Programmable
Reference Voltages
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0.4% Initial Accuracy
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0.7% Overall Reference Tolerance
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2.2V to 36.0V Operating Supply
Voltage and User Programmable
Reference
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36.0V Operating Supply Voltage
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Reference Accuracy Maintained For
Entire Range of Supply Voltage
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Superior Accuracy and Easier
Compensation for Optoisolator
Application
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Improved Architecture Provides a
Known Linear Transconductance with
a +5% Typical Tolerance
UC19431
UC29431
UC39431
UC39431B
DESCRIPTION
The UC39431 is an adjustable shunt voltage regulator with 100mA sink ca-
pability. The architecture, comprised of an error amplifier and
transconductance amplifier, gives the user separate control of the small
signal error voltage frequency response along with a fixed linear
transconductance. A minimum 3MHz gain bandwidth product for both the
error and transconductance amplifiers assures fast response. In addition to
external programming, the IC has three internal resistors that can be con-
nected in six different configurations to provide regulated voltages of 2.82V,
3.12V, 5.1V, 7.8V, 10.42V, and 12.24V. A sister device (UC39432) provides
access to the non-inverting error ampilifer input and reference, while elimi-
nating the three internal resistors.
BLOCK DIAGRAM
UDG-95087
04/99

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