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HGSEMI LM317AT
Configuration
1 options
Configuration
Option 71399
Availability on request
Technical data
Product details
19
specifications
Core information
- Product name
- HGSEMI LM317AT
- Type
- HGSEMI
- Minimum package
- 1000 盒
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- HGSEMI
- Electronic Component
- LM317AT
- Electronic Component
- 1
- Package
- TO-220-3
- Electronic Component
- Linear Regulator(LDO)
- Electronic Component
- 2.83g
- Electronic Component
- 1
- Electronic Component
- BM0227645447
- Operating Temperature
- 40℃~+85℃@(Ta)
- Operating Voltage
- 40V
- Output
- Electronic Component
- Output Voltage
- 1.2V~37V
- Output Current
- 1.5A
- Output Type
- Electronic Component
- Output Channel Count
- 1
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
LM317AT 产品概述
一、概述
LM317AT（华冠 HGSEMI）是一款通用型可调线性稳压器，单通道正输出，输出电流最高可达1.5A，输入耐压40V，输出电压可调范围约1.2V～37V。器件内置过流保护、短路保护与过热保护，适合用作可调稳压电源、后级线性滤波、低噪声参考源及恒流源等场合。TO-220-3 封装便于散热与安装，适配常见的功率应用。
二、主要规格与特性
- 输出类型：可调（线性稳压）
- 输出电压：1.2V ～ 37V（典型参考电压约1.25V）
- 输出电流：最大 1.5A（受散热条件限制）
- 最大工作电压：40V
- 保护功能：过流保护（OCP）、短路保护（SCP）、过热保护（OTP）
- 工作温度：-40℃ ～ +85℃（Ta）
- 电源纹波抑制比（PSRR）：80dB @ 12Hz（典型）
- 封装：TO-220-3，金属散热片与输出相连
三、引脚与封装
TO-220-3 常见引脚顺序（正面朝向观察）：1 = Adj（调整），2 = Output（输出），3 = Input（输入）；金属背板（金属舌/散热片）通常连接到输出脚。安装时注意散热片与机壳、接地的绝缘或导通需求。
四、典型应用与电路建议
- 可调稳压：常用公式 Vout = Vref (1 + R2/R1) + Iadj·R2，建议 R1 ≈ 240Ω 以保证稳定的参考电流与较低的误差。
- 恒流源：通过将 LM317 配置为恒流模式（把输出端接负载并在调节端与输出间放置电阻）可实现简单的 LED 恒流驱动。
- 滤波与低噪声电源：在调节端并联 Cadj（常用 10µF）可提升纹波抑制；输入侧建议使用 0.1µF 陶瓷贴片与 10µF 电解并联，输出侧使用 1–10µF 低 ESR 电容以改善瞬态响应。
五、散热与可靠性
线性稳压器的功耗由 P = (Vin - Vout) × Iout 决定。举例：Vin=12V、Vout=5V、Iout=1.5A 时，器件需耗散约10.5W，必须配合合适的散热片或强制风冷。实际允许的输出电流受散热条件和环境温度限制，建议在设计时留足安全裕量并考虑热阻、接触热阻与导热硅脂。
六、使用注意与建议
- 输入电压应保证 Vin ≥ Vout + DROPOUT（典型约2V，负载电流越大压差要求越高）。
- 保持输入电容贴近输入脚，输出及调节电容布局尽量短路径，减少寄生感抗。
- 若存在较大纹波或需更高 PSRR，可在 Adj 上并联电容以提高抑制率，但应注意影响瞬态。
- 避免长期在热关断或频繁过流状态下工作，以延长器件寿命。
- 不要超过最大输入电压 40V，输出端也应避免遭受反向或瞬态冲击。
LM317AT（华冠）以其简单、可靠和良好的保护特性，适合用于实验台电源、精密模拟电路及需要低噪声、可调输出的场合。设计时结合合理的散热、旁路与保护电路，可获得稳定且长期可靠的性能表现。
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