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LM393N是芯伯乐电子(XBLW)推出的双路通用电压比较器,采用DIP-8双列直插封装,兼具低失调精度、高速响应、宽电源适应性及TTL兼容输出等核心优势,广泛适用于工业控制、消费电子、电源监测等场景的模拟信号比较与电平检测。
例如电池电压监测:将电池电压分压后接至比较器输入端,当电压低于截止阈值时,输出低电平触发充电/报警;1mV失调电压可精准识别电压变化,25nA偏置电流不影响电池负载。
用两路比较器实现上下限检测:一路比较电源过压阈值,一路比较欠压阈值,当输入信号在窗口内时输出特定电平,用于电源状态监测、传感器信号范围判断。
对传感器输出的不规则微弱脉冲进行整形,输出标准TTL电平脉冲,便于后续数字电路处理;1.3ns传播延迟保证高频脉冲整形精度。
在电源电路中,将电流采样电压/电压分压信号接至比较器,超过保护阈值时输出低电平,触发MOS管关断或继电器动作,实现过流过压防护。
作为逐次逼近型ADC的核心比较器,将模拟输入与DAC参考电压比较,输出数字逻辑电平,完成模数转换关键步骤。
LM393N采用标准引脚排列,具体功能如下:
引脚号 功能描述 备注 1 输出端1(OUT1) 集电极开路,需外接上拉电阻 2 反相输入端1(IN1⁻) 输入电压≤Vcc、≥Vee 3 同相输入端1(IN1⁺) 输入电压≤Vcc、≥Vee 4 负电源端(VEE) 单电源时接地 5 同相输入端2(IN2⁺) 输入电压≤Vcc、≥Vee 6 反相输入端2(IN2⁻) 输入电压≤Vcc、≥Vee 7 输出端2(OUT2) 集电极开路,需外接上拉电阻 8 正电源端(VCC) 单电源2V36V,双电源+1V+18V电源连接规范:
输入信号限制:
输入电压需满足 VEE ≤ IN± ≤ VCC,超出范围可能导致输入饱和或器件损坏。
输出负载要求:
集电极开路最大灌电流20mA(典型值),拉电流由上拉电阻决定(建议1kΩ~10kΩ,≤2mA),避免过重负载导致电平不稳定。
温度环境:
工作温度0℃+70℃(商业级),存储温度-55℃+125℃,避免极限温度长时间工作。
LM393N(XBLW)凭借低失调精度、高速响应、宽电源范围及TTL兼容输出等优势,成为工业控制、消费电子、原型开发等领域的常用比较器器件。DIP-8封装便于手工焊接,适合各类基础比较与电平检测应用,兼顾性能与成本效益。
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