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TL431

Adjustable Precision Shunt Regulator

FEATURES
  • Precision Reference Voltage
  • AIC431 :2.495V ±0.5%
  • TL431A :2.495V ±1.0%
  • TL431 :2.495V ±1.6%
  • Sink Current Capability: 200mA
  • Minimum Cathode Current for Regulation: 250uA
  • Equivalent Full-Range Temperature Coefficient: 50 ppm/°C
  • Fast Turn-On Response
  • Low Dynamic Output Impedance: 0.08Ω
  • Adjustable Output Voltage
  • Low Output Noise
  • Space Saving Packages: SOP-8, SOT23-3, SOT89-3 and TO92-3
APPLICATIONS
  • Linear Regulators
  • Adjustable Supplies
  • Switching Power Supplies
  • Battery Operated Computers
  • Instrumentation
  • Computer Disk Drivers
DESCRIPTION
The AIC431, TL431A and TL431 are 3-terminal adjustable precision shunt regula-tors with guaranteed temperature stability over the applicable extended commercial temperature range. The output voltage may be set at any level greater than 2.495V (VREF) up to 30V merely by selecting two external resistors that act as a voltage divider net-work. These devices have a typical output impedance of 0.08Ω. Active output circuitry provides a very sharp turn-on characteristics, making these devices excellent improved replacements for zener diodes in many applications.
The precise ±0.5% reference voltage tolerance of the AIC431 makes it possible in many applications to avoid the use of a vari-able resistor, consequently saving cost and eliminating drift and reliability problems as-sociated with it.
TYPICAL APPLICATION


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