Texas Instruments TLA431/TLA432 All-Capacitor References
Texas Instruments TLA431/TLA432 All-Capacitor Precision Programmable References are three-terminal adjustable shunt regulators that are stable with all capacitor loads. These modules are pin-compatible with industry-standard TL431 and TL432, but with better stability to support all capacitor loads. The devices feature an output cathode voltage that can be set to values between Vref (2.495V) and 36V, with two external resistors. The TLA431 and TLA432 offer a typical output impedance of 0.2Ω and are specified in two temperature grades, I and Q. The regulators also provide a good stability reference voltage over the entire -40°C to +125°C temperature range. Texas Instruments TLA431/TLA432 All-Capacitor Precision Programmable References are ideal replacements for Zener diodes in many applications, including onboard regulation, switching power supplies, and adjustable power supplies.
Features
- No output capacitor required
- Stable with all capacitive loads
- 1% reference voltage tolerance at +25°C (A grade)
- Vref to 36V adjustable output voltage
- Typical temperature drift (TLA43xA)
- 8mV (I temp)
- 11mV (Q temp)
- Low output noise
- 0.2Ω typical output impedance
- 0.2mA to 100mA sink-current capability
- Pin-compatible with industry-standard TL431 and TL432
- Ideal replacements for Zener diodes
- -40°C to +125°C operating temperature range
Applications
- Rack server power
- Industrial AC/DC
- AC inverter and VF drives
- Servo drive control modules
- Notebook PC power adapter designs
Simplified Schematic
Functional Block Diagram
