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 | 0.70 | W | 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 | – | 2.58 | 2.423 | – | 2.567 | Reference 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 | – | 2.55 | 2.453 | – | 2.537 | 2.475 | 2.495 | 2.515 | 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 | – | – | 5.2 | – | – | 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范围 | DIref | – | 0.8 | 2.5 | – | 0.4 | 1.2 | – | 0.8 | 2.5 | μA | 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 | Off–State 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 | Ω | 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 单电源比较温度补偿电路 | 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 | | 图39 封装图 | 以上文件译自MOTOROLA 公司TL431
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