TL432LI

Product Folder Order Now Technical Documents Tools & Software Support & Community TL431LI TL432LI SLVSDQ6A – JULY 2018 – REVISED NOVEMBER 2018 TL431LI / TL432LI Programmable Shunt Regulator with Optimized Reference Current 1 Features 1 Reference Voltage Tolerance at 25°C – 0.5% (B Grade) – 1% (A Grade) Minimum Typical Output Voltage: 2.495 V Adjustable Output Voltage: Vref to 36 V Operation From −40°C to +125°C (Q Temp) Maximum Temperature Drift – 10 mV (C Temp) – 17 mV (I Temp) – 27 mV (Q Temp) 0.3-Ω Typical Output Impedance Sink-Current Capability – Imin = 1 mA (max) – IKA = 15 mA (max) Reference Input Current IREF: 0.4 μA (max) Deviation of Reference Input Current over Temperature, II(dev): 0.3 μA (max) 2 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 3 Description The TL431LI device is a three-terminal adjustable shunt regulator, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref (approximately 2.495 V) and 36 V, with two external resistors. These devices have a typical output impedance of 0.3 Ω. Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboar...