UC39431B Datasheet | Unitrode

Precision Adjustable Shunt Regulator UC19431 UC29431 UC39431 UC39431B 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 pensation for Optoisolator Application - Improved Architecture Provides a Known Linear Transconductance with a +5% Typical Tolerance DESCRIPTION The UC39431 is an adjustable shunt voltage regulator with 100m A sink capability. The architecture, prised 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 connected 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 eliminating the three internal resistors. BLOCK DIAGRAM 4/97 UDG-95087...