TL431 限流器或
電流源調節器的典型應用。 TL431 是 3 端子可調精密并聯
穩壓器，可在適用的擴展商業溫度范圍內保證溫度穩定性。只需選擇兩個充當
分壓器網絡的外部電阻器，即可將輸出電壓設置為大于 2.495V (VREF) 直至 30V 的任何電平。這些器件的典型
輸出阻抗為 0.08 歐姆。有源輸出電路提供非常敏銳的開啟特性，使這些器件成為許多應用中
齊納二極管的出色改進替代品
說明
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Typical Application for TL431 Current Limiter or Current Source Regulator. The TL431 is 3-terminal adjustable precision shunt regulators 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 network. These devices have a typical output impedance of 0.08 ohm. Active output circuitry provides very sharp turn-on characteristics, making these devices excellent improved replacements for zener diodes in many applications
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