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TI TL431QDR
Configuration
1 options
Configuration
24+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- TI(Texas Instruments) TL431QDR
- Type
- TI
- Minimum package
- 2500 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- TI(Texas Instruments)
- Electronic Component
- TL431QDR
- Electronic Component
- 1
- Package
- SOIC-8
- Electronic Component
- Voltage Reference IC
- Electronic Component
- ±2.2%
- Electronic Component
- 0.33g
- Electronic Component
- 1
- Electronic Component
- BM0058431906
- Operating Temperature
- 40℃~+125℃@(Ta)
- Operating Voltage
- 2.5V~36V
- Output Voltage
- 2.495V~36V
- Output Current
- 100mA
- Output Type
- Electronic Component
- Electronic Component
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
TL431QDR 产品概述
一、概述
TL431QDR 是德州仪器（TI）家族中的可调并联（分流）型电压基准/精密可调稳压器，工作温度范围宽（-40℃ ~ +125℃），输入/输出电压范围大（2.5V ~ 36V），可提供高达 100mA 的分流电流，典型参考电压为 2.495V。器件以 SOIC-8 封装提供，适用于需要精密基准、电压监测或可编程齐纳替代的场合。
二、主要规格
- 输出类型：可调（并联/分流参考）
- 基本参考电压：约 2.495V（可调范围 2.495V ~ 36V）
- 工作电压：2.5V ~ 36V
- 最大分流电流：100mA
- 最小阴极（分流）电流以维持调节：1mA
- 精度：±2.2%（典型器件级别）
- 工作温度：-40℃ ~ +125℃（Ta）
- 封装：SOIC-8（便于手工焊接与散热）
三、功能原理与计算公式
TL431QDR 本质上是一个带有误差放大器的可编程并联稳压器，通过在 REF 引脚与阴极间接入分压电阻实现输出电压的设定。常用计算关系： VOUT = VREF × (1 + R1 / R2) + IREF × R1 其中 VREF ≈ 2.495V，IREF 为参考输入电流（通常很小，可在精密计算时考虑）。
注意：器件为分流型，必须保证至少 1mA 的分流电流以维持稳压。在负载为高阻状态时需通过串联限流电阻或旁路元件确保这一点。
四、典型应用场景
- 开关电源闭环参考与误差放大器（配合光电耦合器实现隔离反馈）
- 精密线性稳压器参考源与可编程齐纳二极管替代
- 电池管理与充电限制、过压/欠压检测电路
- 精密比较与参考信号源（ADC、DAC 的参考、温度补偿电路）
五、设计与布局注意事项
- 保证 REF 与分压电阻之间走线短且靠近器件，降低噪声耦合。
- 在 REF 与阴极间并联小电容（如 10nF）可改善电路稳定性与降低噪声，但需根据所用外部电阻值和负载条件验证相位裕度。
- 若器件在高电压差或大电流下工作，需评估封装热阻并在 PCB 上留意散热（必要时加铜皮或热过孔）。
六、热设计与功耗估算
器件耗散功率 Pd = VKA × IKA（VKA 为阴极到阳极电压，IKA 为流过器件的电流）。在有外部串联限流时，器件实际承受电流为限流电流减去负载电流。设计时应确保 Pd 与 SOIC-8 封装及 PCB 散热能力匹配，避免超过结温限制。
七、选型与使用建议
- 若需要更高精度或温漂性能，可考虑更高精度等级或配合外部校准电路；若功耗与封装限制严格，可选用小封装低功耗版本。
- 在实际应用中先验证最小保持电流、带载条件与稳定性，尤其在低负载或大的分压比情况下要注意补偿和旁路。
总结：TL431QDR 在宽电压、宽温度范围内提供可靠的可调基准与分流稳压能力，SOIC-8 封装易于应用于各种电源管理与精密参考场合。
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