All-capacitor stable precision programmable reference with RKA pin layout

The TLA431 and TLA432 devices are three-terminal

adjustable shunt regulators that are stable with all capacitor loads. The devices

are pin compatible with the industry standard TL431 and TL432 but with improved

stability to support all capacitor loads. The output cathode voltage can be set to

any value between Vref (2.495V) and 36V, with two external resistors.

These devices have a typical output impedance of 0.2Ω. Active output circuitry

provides a very sharp turn-on characteristic, making these devices excellent

replacements for Zener diodes in many applications, such as on-board regulation,

adjustable power supplies, and switching power supplies. The TLA431 also functions

as a comparator for undervoltage monitoring. The internal amplifier and reference of

the TLA431 is used an error amplifier in isolated optocoupler flyback power

supplies. The TLA432 device has exactly the same functionality and electrical

specifications as the TLA431 device.

The TLA431 and TLA432 devices are specified in two temperature grades, I and Q. In addition, the devices offer good stability reference voltage over the entire temperature range.