1 Features
• No output capacitor required
• Stable with all capacitive loads
• Reference voltage tolerance at 25°C
– 1% (A grade)
• Adjustable output voltage: Vref to 36V
• Operation from −40°C to 125°C
• Typical temperature drift (TLA43xA)
– 8mV (I temp)
– 11mV (Q temp)
• Low Output Noise
• 0.2Ω Typical output impedance
• Sink-current capability: 0.2mA to 100mA
• Pin-compatible with industry-standard TL431 and
TL432

2 Applications
• Rack server power
• Industrial AC/DC
• AC inverter & VF drives
• Servo drive control module
• Notebook PC power adapter design

3 Description
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 onboard 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.