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.

Precision Adjustable Shunt Regulator

FEATURES

• Multiple On-Chip Programmable

Reference Voltages

• 0.4% Initial Accuracy

• 0.7% Overall Reference Tolerance

• 2.2V to 36.0V Operating Supply

Voltage and User Programmable

Reference

• 36.0V Operating Supply Voltage

• Reference Accuracy Maintained For

Entire Range of Supply Voltage

• Superior Accuracy and Easier

Compensation for Optoisolator

Application

• Improved Architecture Provides a

Known Linear Transconductance with

a +5% Typical Tolerance

04/99

BLOCK DIAGRAM

UDG-95087