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Texas Instruments TL43xLI/TL43xLI-Q1 Programmable Shunt Regulators

Texas Instruments TL43xLI/TL43xLI-Q1 Programmable Shunt Regulators are three-terminal adjustable shunt regulators with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.495V) and 36V, with two external resistors. These devices have a typical output impedance of 0.3Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications. These applications include onboard regulation, adjustable power and switching power supplies. These devices are a pin-to-pin alternative to the industry standard TL431, with optimized Iref and IIdev performance. The lower Iref and IIdev values enable designers to achieve higher system accuracy and lower leakage current. The TL432LI/TL432LI-Q1 device has precisely the same functionality and electrical specifications as the TL431LI/TL431LI-Q1 device but has a different pinout for the DBZ package.

The Texas Instruments TL431LI/TL431LI-Q1 device is offered in two grades, with initial tolerances (at 25°C) of 0.5% and 1%, for the B and A grades, respectively. In addition, low output drift versus temperature ensures good stability over the entire temperature range. The TL43xLI-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

  • Reference voltage tolerance at 25°C
    • 0.5% (B Grade)
    • 1% (A Grade)
  • 2.495V minimum typical output voltage 
  • Vref to 36V adjustable output voltage 
  • Operation from −40°C to +125°C (Q temp)
  • Maximum temperature drift
    • 10mV (C Temp)
    • 17mV (I Temp)
    • 27mV (Q Temp)
  • 0.3Ω typical output impedance
  • Sink-current capability
    • Imin = 1mA (max)
    • IKA = 15mA (max)
  • 0.4µA (max) reference input current (IREF) 
  • 0.3µA (max) deviation of reference input current over temperature (II(dev)) 

Applications

  • Adjustable voltage and current referencing
  • Secondary side regulation in flyback SMPS
  • Zener diode replacement
  • Voltage monitoring
  • Precision constant current sink/source
  • Comparator with integrated reference

Datasheets

Functional Block Diagram

Block Diagram - Texas Instruments TL43xLI/TL43xLI-Q1 Programmable Shunt Regulators

Related Development Tool

Texas Instruments UCC28C56EVM-066 Evaluation Module

Facilitates the evaluation of an efficient primary-side controlled flyback auxiliary power supply.

Learn Moretungkol sa Texas Instruments UCC28C56EVM-066 Evaluation Module View Productskaugnay ng Texas Instruments UCC28C56EVM-066 Evaluation Module
Inilathala: 2019-01-14 | Na-update: 2023-05-26