TLVH431AIDBZR


可调式精密并联稳压器,1.24V 基准电压,1% A 级,VO=1.24-18V,IK=0.1-70mA,0.25Ohm zKA,SOT-23-3,-40 至 85C

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制造商零件:

TLVH431AIDBZR

包装:

SOT-23-3(DBZ),2.92 x 1.30 x 1.22 毫米

品牌:
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产品概览

TLVH431AIDBZR 是德州仪器制造的一款低压可调精密并联稳压器,采用 1.24 V 带隙基准,具有 1% 初始精度(A 级)。该器件采用紧凑型 SOT-23-3 (DBZ) 表面贴装封装,使用两个外部电阻器,支持从 VREF(1.24 V)到 18 V 的可调输出电压。该器件工作在 100 uA 至 70 mA 的宽阴极电流范围内,典型输出阻抗为 0.25 欧姆,是低压齐纳二极管的理想替代品。与广泛使用的 TL431(2.495 V 基准电压)相比,TLVH431A 具有更低的基准电压(1.24 V)和更低的最小阴极电流(100 uA 对 1 mA),可在 3 V 至 3.3 V 系统中进行调节。工业级版本(后缀 I)的指定温度范围为 -40 C 至 +85 C。.

主要规格

基准电压 (VREF) 1.24 V(典型值)
基准电压公差(A 级,25 C) +/-1%
输出电压范围可调 1.24 V 至 18 V
阴极电流范围 (IK) 100 uA 至 70 mA(连续)
调节时的最小阴极电流 60 uA(典型值),100 uA(最大值)
关态阴极电流 (IK(off)) 0.02 uA(典型值),0.1 uA(最大值)
参考输入电流 (Iref) 0.1 uA(典型值),0.5 uA(最大值)
动态阻抗 (|zKA|) 0.25欧姆(典型值),0.4欧姆(最大值),在f <= 1 kHz
基准电压变化与阴极电压 -1.5 mV/V(典型值),-2.7 mV/V(最大值)
VREF 温度偏差(I 级) 6 mV(典型值),20 mV(最大值)
阴极电压(VKA,绝对最大值) 20 V
阴极电流(绝对最大值) -25 mA 至 80 mA
参考电流(绝对最大值) -0.05 mA 至 3 mA
工作结温 -40 C 至 +85 C(I 级)
存储温度 -65摄氏度至+150摄氏度
ESD 额定值(HBM) 2000 V(二级)
ESD 等级(CDM) 1000 V
包装 SOT-23-3(DBZ),2.92 x 1.30 毫米
合规性 RoHS、REACH、EAR99
MSL 等级 Level-1-260C-UNLIM
铅涂层 镍钯金/镍钯金/锡
互补部件(替代引脚输出) TLVH432A(不同的 SOT-23-3 引脚布局)

特点

  • 低压工作电压低至 1.24 V,低于 TL431 (2.495 V) 和 TL1431
  • 1% 初始基准电压精度(A 级),用于精确调节
  • 输出电压 1.24 V 至 18 V,可通过两个外部电阻器调节
  • 宽工作阴极电流范围:100 uA 至 70 mA
  • 极低的最小阴极电流(60 uA typ),适合低功耗应用
  • 0.25 欧姆典型输出阻抗,实现严格调节
  • 灵敏的导通特性 - 齐纳二极管的理想替代品
  • 低基准输入电流:0.1 uA typ,最大限度减少电阻分压器误差
  • 低关态阴极电流:0.02 uA typ,可将待机功耗降至最低
  • 指定温度范围为 -40 C 至 +125 C(Q 级),-40 C 至 +85 C(I 级)
  • TLVH432 变体提供可选的 SOT-23-3 和 SOT-89 引脚布局
  • 超小型 SC-70 (DCK) 封装选项 - 40% 小于 SOT-23-3
  • 符合 AEC-Q100 标准(1 级),提供 Q-ffix 版本

应用

  • 用于数据转换器和 ADC/DAC 系统的可调电压基准
  • 带光耦合器反馈的隔离反激式 SMPS(3 V 至 3.3 V 输出)的次级侧调节功能
  • 车载调节电路中的低漏电齐纳二极管替代品
  • 精密限流器和恒流灌电流电路
  • 电源管理系统中的电压监测和电源轨监控
  • 比较器集成 1.24 V 带隙基准电压

TLVH431AIDBZR 是德州仪器推出的一款低压可调精密并联稳压器,具有内部 1.24 V 带隙基准,在 25 C 温度条件下具有 1% 初始精度(A 级)。作为一款三端器件,通过使用连接到 REF 引脚的两个外部电阻分压器,可将输出电压编程为 VREF(1.24 V)和 18 V 之间的任意值。这种结构实现了灵活的电压调节,无需为每个目标输出电平配备固定电压的齐纳二极管。该器件的最小阴极电流仅为 60 uA(典型值),大大低于需要 1 mA 电流的 TL431,因此非常适合低功耗和电池供电系统。100 uA 至 70 mA 的宽阴极电流范围为偏置和负载驱动方案提供了很大的设计余量。TLVH431A 的典型动态输出阻抗为 0.25 欧姆,可提供严格的电压调节,其性能比标准齐纳二极管高出一个数量级。有源输出电路具有敏锐的导通特性,可在比较器和监控应用中实现精确的阈值行为。与光耦合器搭配使用时,TLVH431A 可用作 3 V 至 3.3 V 开关模式电源隔离反馈回路中的电压基准和误差放大器,其低基准电压可直接调节低压输出。工业级(后缀为 I)版本的指定工作温度范围为 -40 C 至 +85 C,而后缀为 Q 的版本则可达到 +125 C,并通过了 AEC-Q100 1 级汽车应用认证。.

TLVH431A 通过三个功能子系统作为精密并联稳压器运行:

1.带隙基准和误差放大器:该器件的核心是一个内部 1.24 V 带隙电压基准,连接到高增益比较器的非反相输入端。REF 引脚是该比较器的反相输入端。当 REF 引脚的电压超过内部 1.24 V 基准电压时,误差放大器会驱动输出达林顿级吸收更多阴极电流。反之,当 REF 引脚电压低于 1.24 V 时,放大器会减小阴极电流。当器件处于调节状态时,这种负反馈回路会迫使 REF 引脚保持 1.24 V,从而建立一个稳定的电压参考点。.

2.通过外部电阻分压器调节输出电压:当配置两个外部电阻器 R1(从阴极到 REF)和 R2(从 REF 到阳极)时,阴极的输出电压由以下因素决定:VO = VREF x (1 + R1/R2) + Iref x R1。由于 Iref 通常只有 0.1 uA,因此对于低于 10 kOhm 的电阻值,Iref x R1 项可以忽略不计,从而得出 VO 大约等于 VREF x (1 + R1/R2)。这使得输出电压的设置范围从 1.24 V(R1 = 0)到 18 V(R1/R2 比率允许),为各种应用提供了灵活性。.

3.分流调节和动态阻抗:该器件通过将多余电流从阴极分流至阳极进行调节。当输出电压升至编程设定点以上时,内部达林顿对会更大程度地导通,汇入额外的电流,将阴极电压拉低。0.25 欧姆的动态输出阻抗(f <= 1 kHz 时的典型值)可量化器件在负载电流变化时保持调节的效率。在关断状态(REF 引脚低于 1.24 V)下,阴极电流降至仅 0.02 uA(典型值),最大限度地降低了待机条件下的功耗。.

针脚编号. 名称 类型 功能
1 REF 输入 参考输入。与内部误差放大器反相输入相连。该器件通过调节使该引脚相对于 ANODE 的电压保持在 1.24 V。从 CATHODE 到 ANODE 的电阻分压器可设定所需的输出电压。基准输入电流通常为 0.1 uA,最大限度地减小了分压器的负载误差。.
2 模式 输入/输出 并联电流输出和电压输入。调节时,电流流入该引脚,然后通过 ANODE 输出。阴极电压即为稳压输出。当 REF 超过 1.24 V 时,阴极电流增大,从而拉低电压;当 REF 低于 1.24 V 时,阴极电流减小。最大持续阴极电流:70 mA。.
3 ANODE 地面 共用返回端子,通常与电路接地相连。所有电压测量均以此引脚为基准。流入阴极的电流通过阳极流出。.
  • 隔离式 SMPS 反馈调节:TLVH431A 与 3 V 至 3.3 V 反激式转换器次级侧的光耦合器配对,将输出电压的一部分与其 1.24 V 基准电压进行比较,并驱动光耦合器 LED 以关闭反馈回路,从而实现 +/-1% 精度的精确输出调节。.
  • 板载可调电压基准:利用两个外部电阻器,该器件可为 ADC/DAC 电压基准、偏置网络或比较器阈值提供 1.24 V 至 18 V 的可编程基准,而无需多个固定电压齐纳二极管。.
  • 低漏电齐纳二极管替代品:TLVH431A 的关态电流仅为 0.02 uA,导通灵敏,可在电压监控和保护电路等要求精确电压箝位、最小漏电流和严格容差的应用中替代齐纳二极管。.
  • 精密电流沉:通过在 REF 引脚上配置一个感应电阻器,该器件可在电阻器上保持恒定电压,从而为 LED 偏置、传感器激励或电池充电电路建立一个精密的恒流灌。.
  • 电源轨电压监控器:1.24 V 的陡峭阈值和较低的基准电流使该器件与一个电阻分压器和一个阴极上拉电阻器相结合,适用于欠压和过压检测。.
制造商 部件编号 包装 主要说明
德州仪器 TLVH431BIDBZR SOT-23-3 精度更高的 B 级(0.5%),引脚兼容,VREF 和电流范围相同
德州仪器 TLVH432AIDBZR SOT-23-3 替代 SOT-23-3 引脚布局(CATHODE=1、REF=2 与 TLVH431 互换),电气规格相同
onsemi NCP431AIDBZR SOT-23-3 引脚兼容,1% A 级,1.24 V 基准电压,80 mA 最大阴极电流
二极管公司 AP431A SOT-23-3 引脚兼容并联稳压器,1% 容差,1.24 V 基准电压,80 mA 阴极电流
意法半导体 TS431ACX SOT-23-3 可调式 1.24 V 分流基准,1% A 级,引脚兼容,阴极电流 30 mA
德州仪器 TL431AIDBZR SOT-23-3 更高的基准电压(2.495 V),相同的引脚输出,适用于需要 VREF > 2.5 V 的应用
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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Support Excel, PDF, CSV format files for full BOM list quotation

Submit your component procurement and custom packaging needs via the form below. We will provide a detailed quotation and professional solution within 1–8 working hours.