TL431中文资料简介
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, 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
VKA37
VCathode Current Range, Continuous 阴极电流范围,连续
IK–100 to +150
mAReference Input Current Range, Continuous 参考输入电流范围,连续
Iref–0.05 to +10
mAOperatingJunctionTemperature工作结温
TJ150
℃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 Temperature
D, LP后缀塑封PD 0.70W P后缀塑封1.10 DM 后缀塑封0.52Total Power Dissipation @ TC = 25℃ Derate above 25℃ Case Temperature 总耗散功率 外壳温度
D, LP后缀塑封PD1.5
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 VCathode 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 – ℃/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 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 TL431BIUnit 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
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