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1.0mA 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 range applies, unless
otherwise 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

150

℃

Operating Ambient Temperature Range 操作环境温度范围

TL431I,TL431AI, TL431BI TA

–40 to +85

℃ TL431C, TL431AC, TL431BC 0 to +70

StorageTemperature 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 Temperature

D, LP后缀塑封PD 0.70W P后缀塑封1.10 DM 后缀塑封0.52

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3.0

RECOMMENDED 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, Junction–to–Ambient 热阻，结点到环境RqJA 178 114 240 ℃/W Thermal Resistance, Junction–to–Case 热阻，结到外壳RqJC 83 41 – ℃/W

ELECTRICAL 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 mA   TA = 25℃Vref 2.44  2.495  2.55  2.44 2.495 2.55  V TA = Tlow to Thigh (Note 1)2.41–2.582.423 – 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 in Reference Input Voltage to Change in Cathode to Anode Voltage IK = 10 mA (Figure 2), △VKA = 10 V to Vref  △Vref
△VKA–  –1.4 –2.7  –  –1.4  –2.7 mV/V △VKA=36V to 10 V-–1.0 –2.0––1.0–2.0 Reference Input Current (Figure 2) 参考输入电流IK = 10 mA, R1 = 10k, R2 = ∞ TA = 25℃Iref –  1.8  4.0  –  1.8 4.0 μA TA = Tlow to Thigh (Note 1)––6.5– –5.2 Reference 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 μA 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 Off–State 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 Ω

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 = 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 –2.552.453–2.5372.4752.4952.515 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 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 Vref△Vref
△VKA–  –1.4  –2.7  –  –1.4  –2.7  –  –1.4  –2.7 mV/V △VKA = 36 V to 10 V ––1.0–2.0––1.0–2.0––1.0–2.0 Reference Input Current (Figure 2)参考输入电流 IK = 10 mA, R1 = 10 k, R2 = ∞  TA = 25℃ Iref –  –1.8  4.0 –  1.8  4.0  –  1.1  2.0 μA TA = Tlow to Thigh (Note 1)  –6.5