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wordTL431，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。平面向上，元件脚向自己左起，1脚RREF也就是控制极2脚AANODE元件符号像二极管的正极3脚KCATHODE类似二极管的负极介绍:，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25TL431B 负载电流能力1.0mA to 100mA等效全围温度系数50 ppm/典型温度补偿操作全额定工作温度围低输出噪声电压 图1 TO92封装引脚图图2 8脚封装引脚功能图3 SOP-8 贴片封装引脚图图4 TL431符号与部方框图 图5 TL431部电路图MAXIMUM RATINGS (Full operating ambient temperature range applies, unlessotherwise noted.)最大额定值环境温度围适用，除非另有说明。 Rating 参数Symbol 符号 数值Unit 单位 Cathode to Anode Voltage阴极阳极电压VKA 37 V Cathode Current Range, Continuous 阴极电流围，连续IK 100 to +150 mA Reference Input Current Range, Continuous 参考输入电流围，连续Iref 0.05 to +10 mA OperatingJunctionTemperature工作结温TJ 150 Operating Ambient Temperature Range 操作环境温度围TL431I,TL431AI, TL431BI TA 40 to +85 TL431C, TL431AC, TL431BC0 to +70StorageTemperature Range储存温度围Tstg 65 to +150 Total Power Dissipation总耗散功率 常温 TA = 25 Derate above 25 Ambient TemperatureD, LP后缀塑封PD W P后缀塑封1.10 DM 后缀塑封Total Power Dissipation TC = 25 Derate above 25 Case Temperature 总耗散功率 外壳温度D, LP后缀塑封PD 1.5 W P后缀塑封REMENDED OPERATING CONDITIONS建议操作条件 Condition 条件Symbol 符号 Min最大值 Max最小值 Unit 单位 Cathode to Anode Voltage 阴极阳极电压VKA Vref 36 V Cathode Current 阴极电流IK 1.0 100 mA THERMAL CHARACTERISTICS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 Thermal Resistance, JunctiontoAmbient 热阻，结点到环境RqJA 178 114 240 /W Thermal Resistance, JunctiontoCase 热阻，结到外壳RqJC 83 41 /WELECTRICAL CHARACTERISTICS(TA=25, unless otherwise noted.)电气特性25 ，除非另有说明。 Characteristic 特性 Symbol 符号 TL431I TL431C Unit 单位最小值 典型值 最大值最小值 典型值 最大值Reference Input Voltage (Figure 1)参考输入电压 VKA = Vref, IK = 10 mATA = 25Vref 2.44 2.495 V TA = Tlow to Thigh (Note 1)2.423 Reference Input Voltage Deviation Over Temperature Range参考输入电压偏差温度围 (Figure 1, Notes 1, 2) VKA= Vref, IK = 10 mA DVref 7.0 30 3.0 17 mV Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage IK = 10 mA (Figure 2), VKA = 10 V to VrefVrefVKA1.4 2.7 mV/V VKA=36V to 10 V-1.0 2.0 Reference Input Current (Figure 2) 参考输入电流IK = 10 mA, R1 = 10k, R2 = TA = 25Iref 1.8 4.0 A TA = Tlow to Thigh (Note 1)5.2 Reference Input Current Deviation Over Temperature Range参考输入电流偏差温度围 (Figure 2, Note 1, 4) IK = 10 mA, R1 = 10 k, R2 = DIref 0.8 2.5 0.4 1.2 A Minimum Cathode Current For Regulation VKA = Vref (Figure 1) 最小阴极电流调节Imin 0.5 1.0 0.5 1.0 mA OffState Cathode Current (Figure 3) VKA = 36 V, Vref = 0 V 断态阴极电流Ioff 260 1000 260 1000 nA Dynamic Impedance (Figure 1, Note 3)动态阻抗 VKA = Vref, DIK=1.0mA to 100mA f 3 1.0kHz |ZKA| 0.22 0.5 0.22 0.5 ELECTRICAL CHARACTERISTICS (TA = 25, unless otherwise noted.)电气特性25，除非另有说明。 Characteristic 特性 Symbol 符号TL431AI TL431AC TL431BI Unit 单位最小值 典型值 最大值最小值 典型值 最大值最小值 典型值 最大值Reference Input Voltage (Figure 1)参考输入电压 VKA = Vref, IK = 10 mA TA = 25Vref 2.47 2.507 V TA = Tlow to Thigh 2.44 2.515 Reference Input Voltage Deviation Over Temperature Range (Figure 1, Notes 1, 2) 参考输入电压偏差温度围VKA= Vref, IK = 10 mA DVref 7.0 30 3.0 17 3.0 17 mV Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage IK = 10 mA (Figure 2),VKA = 10 V to VrefVrefVKA2.7 mV/V VKA = 36 V to 10 V 2.0 Reference Input Current (Figure 2)参考输入电流 IK = 10 mA, R1 = 10 k, R2 = TA = 25Iref 4.0 2.0 A TA = Tlow to Thigh (Note 1)6.5 4.0 Reference Input Current Deviation Over Temperature Range (Figure 2, Note 1) IK = 10 mA, R1 = 10k, R2 = 参考输入电流偏差温度围DIref 0.8 2.5 0.4 1.2 0.8 2.5 A Minimum Cathode Current For Regulation 最小阴极电流调节VKA = Vref (Figure 1) Imin 0.5 1.0 0.5 1.0 0.5 1.0 mA OffState Cathode Current(Figure 3) 断态阴极电流VKA = 36V, Vref =0V Ioff 260 1000 260 1000 230 500 nA Dynamic Impedance (Figure 1, Note 3) VKA = Vref, DIK = 1.0 mA to 100 mA f 3 1.0 kHz 动态阻抗|ZKA| 0.22 0.5 0.22 0.5 0.14 0.3 图6 测试电路VKA = Vref 图7 测试电路VKA Vref图8 测试电路for Ioff曲线图：图9 阴极电流与阴极电压 图10阴极电流与阴极电压图11 参考输入电压与常温图12 参考输入电流与常温图13 变化的参考输入电压与阴极电压图14 断态阴极电流随环境温度图15 动态阻抗与频率图16 动态阻抗随环境温度图17开环电压增益与频率图18谱噪声密度图19 脉冲响应图20 稳定的边界条件应用法：图21测试电路曲线a 边界条件的稳定性 图22曲线测试电路的B，C和D边界条件的稳定性 图23并联稳压器电路图图24 大电流并联稳压器电路图25 控制三端固定稳压输出电路图26 串联稳压调节电路 图27 过压保护电路图28 恒流源电路图29 恒定流入电流源电路图30 双向可控硅过压保护电路图31 电压监视器电路图32 单电源比拟温度补偿电路 图33 线性欧姆表电路图图34 简单的400毫瓦唱机放大器电路 图35 高效率降压型开关转换器电路图 图36 简体TL431器件模型图37 封装图图38 SOP-8 贴片封装图14 / 14
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