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基于TL431LI的具有经优化的基准电流的可调精密分流稳压器

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发表于 2018-12-6 17:44:29 | 显示全部楼层 |阅读模式
基于TL431LI的具有经优化的基准电流的可调精密分流稳压器
  1 特性
  25°C 下的基准电压容差
  0.5%(B )
  1%(A )
  最低典型输出电压:2.495V
  可调输出电压:Vref 36V
  −40°C +125°C 的运行范围
  最大温漂 (TL431LIB)
  34mV
  低输出噪声
  0.3Ω 输出阻抗典型值
  灌电流能力
  Imin = 1mA(最大值)
  IKA = 15mA(最大值)
  基准输入电流 IREF0.8μA(最大值)
  整个温度范围内的基准输入电流偏差 II(dev)0.4μA(最大值)
  2 应用
  可调节电压和电流基准
  反激式 SMPS 中的次级侧调节
  齐纳二极管替代产品
  电压监视
  精密恒定灌/拉电流
  具有集成式基准的比较器
  3 说明
  TL431LI 器件是 3 端子可调节并联稳压器,在适用的汽车级、商用级和军用级温度范围内均可满足规定的热稳定性。可以通过两个外部电阻器将输出电压设置为介于 Vref(约为 2.495V)36V 之间的任意值。这些器件具有 0.3Ω 的输出阻抗典型值。有源输出电路可提供非常急剧的导通特性,从而使这些器件在许多应用中成为齐纳二极管的出色 替代品,这些应用包括板载稳压、可调节电源和开关电源。这款器件是工业标准 TL431 的引脚对引脚替代品,且具有优化的 Iref IIdev 性能。更低的 Iref IIdev 值可帮助设计人员实现更高的系统精度和更低的漏电流。TL432LI 器件具有与 TL431LI 器件完全相同的功能和电气特性,但是具有不同的 DBZ 封装引脚排布。
  TL431LI 器件具有 A B 两个等级,25°C 下的初始容差分别为 1% 0.5%。此外,低输出温漂可确保在整个温度范围内保持出色的稳定性。
TL43xLIxQ 器件的额定工作温度范围是 –40°C 125°C
TI产品现货库存在线购买:https://www.iczoom.com/brand/509-c-1-20.html
  This standard device has proven ubiquity and versatility across a wide range of applications, ranging from power to signal path. This is due to it's key components containing an accurate voltage reference and opamp, which are very fundamental analog building blocks. TL43xLI is used in conjunction with it's key components to behave as a single voltage reference, error amplifier, voltage clamp or comparator with integrated reference.
  TL43xLI can be operated and adjusted to cathode voltages from 2.495V to 36V, making this part optimum for a wide range of end equipments in industrial, auto, telecom and computing. In order for this device to behave as a shunt regulator or error amplifier, >1mA (Imin(max)) must be supplied in to the cathode pin. Under this condition, feedback can be applied from the Cathode and Ref pins to create a replica of the internal reference voltage.
  Various reference voltage options can be purchased with initial tolerances (at 25°C) of 0.5%, and 1%. These reference options are denoted by B (0.5%) and A (1.0%) after the TL431LI or TL432LI. TL431LI and TL432LI are both functionally, but have separate pinout options.
  The TL43xLIxC devices are characterized for operation from 0°C to 70°C, the TL43xLIxI devices are characterized for operation from –40°C to 85°C, and the TL43xLIxQ devices are characterized for operation from –40°C to 125°C.
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