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1、TL431德州仪器公司(TI)生产的TL431是一是一个有良好的热稳定性能的三端可调分流基准源。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(如图2)。该器件的典型动态阻抗为0.2,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(R)REF也就是控制极2脚(A)ANODE(元件符号像二极管的正极3脚(K)CATHODE(类似二极管的负极)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
2、任何值。该器件的典型动态阻抗为0.2,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0.22负载电流能力1.0mA to 100mA等效全范围温度系数50 ppm/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符号及内部方框图 图5 TL431内部电路图MAXIMUM RATINGS (Full operating ambient temperature
3、 range applies, unlessotherwise noted.)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 Cathode to Anode Voltage阴极阳极电压VKA 37 V Cathode Current Range, Continuous 阴极电流范围,连续IK 100 to +150 mA Reference Input Current Range, Continuous 参考输入电流范围,连续Iref 0.05 to +10 mA OperatingJunctionTemperature工作结温TJ
4、150 Operating Ambient Temperature Range 操作环境温度范围TL431I,TL431AI, TL431BI TA 40 to +85 TL431C, TL431AC, TL431BC0 to +70StorageTemperature Range储存温度范围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 0.70W P后缀塑封1.10 DM 后缀塑封0.52Total Power Dissipation
5、 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3.0RECOMMENDED 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
6、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Referenc
7、e Input Voltage (Figure 1)参考输入电压 VKA = Vref, IK = 10 mA TA = 25Vref 2.44 2.495 2.55 2.44 2.495 2.55 V TA = Tlow to Thigh (Note 1)2.412.582.423 2.567Reference Input Voltage Deviation Over Temperature Range参考输入电压偏差温度范围 (Figure 1, Notes 1, 2) VKA= Vref, IK = 10 mA DVref 7.0 30 3.0 17 mV Ratio of Change
8、 in Reference Input Voltage to Change in Cathode to Anode Voltage IK = 10 mA (Figure 2), VKA = 10 V to Vref VrefVKA 1.4 2.7 1.4 2.7 mV/V VKA=36V to 10 V-1.0 2.01.02.0 Reference Input Current (Figure 2) 参考输入电流IK = 10 mA, R1 = 10k, R2 = TA = 25Iref 1.8 4.0 1.8 4.0 A TA = Tlow to Thigh (Note 1)6.55.2 R
9、eference Input Current Deviation Over Temperature Range参考输入电流偏差温度范围 (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
10、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
11、最大值Reference Input Voltage (Figure 1)参考输入电压 VKA = Vref, IK = 10 mA TA = 25 Vref 2.47 2.495 2.52 2.47 2.495 2.52 2.483 2.495 2.507 V TA = Tlow to Thigh 2.44 2.552.4532.5372.4752.4952.515 Reference Input Voltage Deviation Over Temperature Range (Figure 1, Notes 1, 2) 参考输入电压偏差温度范围VKA= Vref, IK = 10 mA
12、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 VrefVrefVKA 1.4 2.7 1.4 2.7 1.4 2.7 mV/V VKA = 36 V to 10 V 1.02.01.02.01.02.0 Reference Input Current (Figure 2)参考输入电流 IK = 10 mA, R1 = 10 k, R2 = TA =
13、 25 Iref 1.8 4.0 1.8 4.0 1.1 2.0 A TA = Tlow to Thigh (Note 1)6.5 5.24.0 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范围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 I