WMSIC Electronic Components

HGSEMI LM7905CT

ModelLM7905CT
PackageTO-220-3
BrandHGSEMI
Price Price on request Electronic component prices change quickly with market supply and demand. Please refer to the latest WMSIC quotation for current pricing.
Configuration
1 options
Configuration 25+

Available for RFQ

Technical data

Product details

19 specifications

Core information

Product name
HGSEMI LM7905CT
Type
HGSEMI
Minimum package
1000 盒

Technical parameters

Electronic Component
Electronic Component
Electronic Component
1.5V@(1A)
Electronic Component
HGSEMI
Electronic Component
LM7905CT
Electronic Component
1
Package
TO-220-3
Electronic Component
Linear Regulator(LDO)
Electronic Component
2.728g
Electronic Component
1
Electronic Component
BM0228150902
Operating Temperature
20℃~+125℃
Operating Voltage
20V
Output
Electronic Component
Output Voltage
5V
Output Current
1.5A
Output Type
Electronic Component

For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.

LM7905CT 产品概述

一、产品简介

LM7905CT(华冠 HGSEMI 封装 TO-220-3)是一款固定负输出线性稳压器,输出电压为 -5V,面向需要稳定负电源的模拟与混合信号系统。该器件设计用于单通道输出,具备较低静态电流和中等功率输出能力,适合驱动运放、比较器、低频模拟电路及小功率数字电路的负电源需求。

二、主要性能参数

  • 输出类型:固定(-5V)
  • 输出电流:最大 1.5A(单通道)
  • 静态电流(Iq):约 4mA
  • 压差(Dropout):1.5V @ 1A(须保证输入电压比输出电压更负至少该值)
  • 电源抑制比(PSRR):60dB @ 120Hz(对市电纹波有良好抑制能力)
  • 工作电压:±20V 级(请参照系统实际电压边界)
  • 工作温度范围:-20℃ ~ +125℃
  • 封装形式:TO-220-3,便于安装散热片与电路板固定

三、封装与引脚

TO-220-3 封装常用于需要良好散热管理的线性稳压器。典型引脚排列(正面朝向观察,从左到右):

  1. 输入(Input)
  2. 公共/地(Ground)
  3. 输出(Output)
    实际接线时请以器件数据手册为准并注意封装金属背板可能与接地电位连接情况。

四、应用与适用场景

  • 模拟前端电路:运放对称电源中的负电源轨
  • 仪表放大与信号处理:需要低噪声、低纹波负电源的场合
  • 工业与消费电子:传感器、测量接口、控制器中小功率负电源
  • 教学与实验平台:作为负电源演示与供电模块

五、使用建议与注意事项

  • 输入电压要求:为保证稳定输出,输入电压须比目标输出更负至少压差值(例如要得到 -5V 输出,输入电压应不高于 -6.5V)。
  • 旁路电容:建议输入端并联 0.1µF~0.33µF 陶瓷电容以抑制高频干扰,输出端并联 0.1µF 至数十µF 电容(陶瓷或钽电容/电解电容)以保证环路稳定与瞬态响应。
  • 散热管理:在高负载(接近 1.5A)或高压差条件下,器件功耗显著,推荐安装合适散热片并关注结温,避免长期在高温区运行。
  • 保护与可靠性:在有反向供电或输出回灌风险的系统中,考虑加入保护二极管或其他防护电路以防器件损坏。
  • 温度与退化:工作温度范围为 -20℃ 至 +125℃,在极端环境下建议留有裕量并进行热仿真验证。

六、选型要点

选择 LM7905CT 时,应结合系统的最大负载电流、输入电压范围、允许的压降和散热条件。若系统要求更低压差或更高效率,可考虑低压差线性稳压(LDO)或开关型负电源方案;若对纹波抑制要求更高,可配合后级滤波或更高 PSRR 的器件。

总结:LM7905CT 以其简单的外形、稳定的 -5V 输出和良好的纹波抑制,适合多数中低功率负电源应用。合理的旁路电容与散热设计能显著提升系统稳定性与使用寿命。

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