介绍:TL431是一个有良好的热稳定性能的三端可调分流基准电压源。它的输出电压用两个电阻就可以任意地设置到从Vref（2.5V）到36V范围内的任何值。该器件的典型动态阻抗为0.2Ω，在很多应用中可以用它代替齐纳二极管，例如，数字电压表，运放电路、可调压电源，开关电源等等。特点：•可编程输出电压为36V•电压参考误差：±0.4％，典型值@25℃（TL431B）•低动态输出阻抗，典型0.22Ω•负载电流能力1.0mAto100mA•等效全范围温度系数50ppm/℃典型•温度补偿操作全额定工作温度范围•低输出噪声电压图1TO92封装引脚图图28脚封装引脚功能图3SOP-8贴片封装引脚图图4TL431符号及内部方框图图5TL431内部电路图MAXIMUMRATINGS(Fulloperatingambienttemperaturerangeapplies,unlessotherwisenoted.)最大额定值（环境温度范围适用，除非另有说明。）Rating参数Symbol符号数值Unit单位CathodetoAnodeVoltage阴极阳极电压VKA37VCathodeCurrentRange,Continuous阴极电流范围，连续IK–100to+150mAReferenceInputCurrentRange,Continuous参考输入电流范围，连续Iref–0.05to+10mAOperatingJunctionTemperature工作结温TJ150℃OperatingAmbientTemperatureRange操作环境温度范围TL431I,TL431AI,TL431BITA–40to+85℃TL431C,TL431AC,TL431BC0to+70StorageTemperatureRange储存温度范围Tstg–65to+150℃TotalPowerDissipation总耗散功率常温@TA=25℃Derateabove25℃AmbientTemperatureD,LP后缀塑封PDWP后缀塑封1.10DM后缀塑封TotalPowerDissipation@TC=25℃Derateabove25℃CaseTemperature总耗散功率外壳温度D,LP后缀塑封PD1.5WP后缀塑封RECOMMENDEDOPERATINGCONDITIONS建议操作条件Condition条件Symbol符号Min最大值Max最小值Unit单位CathodetoAnodeVoltage阴极阳极电压VKAVref36VCathodeCurrent阴极电流IK1.0100mATHERMALCHARACTERISTICS热特性Characteristic特性Symbol符号D,LP后缀封装P后缀封装DM后缀封装Unit单位ThermalResistance,Junction–to–Ambient热阻，结点到环境RqJA178114240℃/WThermalResistance,Junction–to–Case热阻，结到外壳RqJC8341–℃/WELECTRICALCHARACTERISTICS(TA=25℃,unlessotherwisenoted.)电气特性（25℃，除非另有说明。）Characteristic特性Symbol符号TL431ITL431CUnit单位最小值典型值最大值最小值典型值最大值ReferenceInputVoltage(Figure1)参考输入电压VKA=Vref,IK=10mATA=25℃Vref2.442.4952.552.442.4952.55VTA=TlowtoThigh(Note1)–2.423–ReferenceInputVoltageDeviationOverTemperatureRange参考输入电压偏差温度范围(Figure1,Notes1,2)VKA=Vref,IK=10mADVref–7.030–3.017mVRatioofChangeinReferenceInputVoltagetoChangeinCathodetoAnodeVoltageIK=10mA(Figure2),△VKA=10VtoVref△Vref△VKA––1.4–2.7––1.4–2.7mV/V△VKA=36Vto10V-–1.0––2.0ReferenceInputCurrent(Figure2)参考输入电流IK=10mA,R1=10k,R2=∞TA=25℃Iref–1.84.0–1.84.0μATA=TlowtoThigh(Note1)––––5.2ReferenceInputCurrentDeviationOverTemperatureRange参考输入电流偏差温度范围(Figure2,Note