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TL431 is a controllable precision voltage regulator. Its output voltage can be arbitrarily set with two resistors from Vref (2.5V) to 36V. Typical dynamic impedance is 0.2 Ω, this device in many applications use it instead of voltage < a href = "https://www.diangon.com/wenku/rd/yuanqijian/" "> diode < / a >, for example, digital voltmeter, op-amp circuit, Adjustable voltage < a href = "https://www.diangon.com/wenku/rd/dianyuan/" "> < / a >, < a href = "" https://www.diangon.com/wenku/rd/dianyuan/" "> < / a > switch power supply, etc. Features: Programmable output voltage :2.495V~36V Voltage reference error: ±0.4%, typical ＆#118alue @25℃ (TL431B) Low dynamic output impedance :0.22 ω (typical ＆#118alue) Temperature compensation operation full set operating temperature range Load current 1.0 ma --100 ma. Flat temperature characteristics over the full temperature range, with typical ＆#118alues of 50 PPM /℃, Maximum input voltage is 37V Max. operating current 150mA Internal reference voltage is 2.495V(25°C) Characteristic interpretation: TL431 is called precision reference source, because its voltage error accuracy is very small only 0.4%, at the same time its temperature drift is very low, only 50ppm. Combined with these two things, it is very stable, so it is very helpful when we need to make a precise sampling reference. Copyright diangon.com. All Rights Reserved! But also pay attention to its use limit, for the anode cathode reverse voltage Vka cannot exceed 37V, otherwise it will breakdown 431; In addition, the current flowing through TL431 should not exceed 100mA, otherwise 431 will also be burned out.