The TL431 is a threeterminal programmable shunt regulator diode. This
monolithic IC voltage reference operates as a low temperature coefficient zener
which is programmable from Vref to 36 V with two external resistors. They
exhibit a wide operating current range of 1.0 mA to 100 mA with a typical
dynamic impedance of 0.22 Ohms.
The characteristics of these references make them excellent replacements for
zener diodes in many applications such as digital voltmeters, power supplies,
and op-amp circuitry. The 2.5 V reference makes it convenient to obtain a stable
reference from 5.0 V logic supplies, and since the TL431 operates as a shunt
regulator, it can be used as either a positive or negative voltage
Programmable Output Voltage to 36 V
Voltage Reference Tolerance: ±0.4%, Typ @ 25¡C (TL431B)
Low Dynamic Output Impedance, 0.22 Ohms Typical
Sink Current Capability of 1.0 mA to 100 mA
Equivalent FullRange Temperature Coefficient of 50 ppm/¡C Typical
Temperature Compensated for Operation over Full Rated Operating
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