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ACS725LLCTR-50AB-T是美国ALLEGRO公司推出的隔离式霍尔电流传感器,专为中功率AC/DC电流监测设计,核心功能是实现被测电路与控制电路的电气隔离,同时精准检测±50A范围内的双向电流,输出线性模拟电压信号,适配各类数字化控制系统。该产品凭借高隔离、宽带宽、低损耗等特性,广泛应用于工业、家电、新能源等领域的电流监测与控制场景,是替代传统分流器(无隔离)、互感器(体积大)的理想方案。
支持**±50A AC/DC双向电流检测**,覆盖中功率应用的典型电流需求(如小型伺服电机、低功率开关电源、电动自行车电池组等)。双向检测能力无需额外电路切换,可直接适配电机正反转、电池充放电等需监测正负电流的场景,简化系统设计。
灵敏度为26.4mV/A,即每1A电流对应26.4mV的模拟输出电压,输出与被测电流呈严格线性关系(线性度优异)。该特性便于后端ADC(模数转换器)直接采样,无需复杂的非线性补偿电路,有效提升测量精度(典型精度达±1%)。
带宽达120kHz,响应时间仅4μs,可精准捕捉高频动态电流变化(如开关电源的瞬态电流、电机调速过程中的电流波动)。例如,针对开关频率50kHz的DC-DC转换器,120kHz带宽可完整还原电流波形,满足工业控制对快速电流反馈的需求。
工作电压范围为3V~3.6V,兼容主流MCU(如STM32、ATmega系列)的供电电压,无需额外电压转换电路;同时功耗极低(典型工作电流<10mA),适合电池供电的便携式设备或低功耗系统设计。
隔离电压达2400Vrms,满足UL、CE等安全认证要求,可有效隔离被测高压电路(如220V/380V工业电路)与低压控制电路,保障人员与设备安全;电流端电阻仅1.2mΩ,50A时功率损耗仅3W(I²R=50²×1.2mΩ),不影响被测系统的正常运行。
该产品采用8-SOIC封装(3.90mm宽),尺寸紧凑(与常见MCU引脚间距一致),适合高密度PCB布局,可节省电路板空间(尤其适配小型化设备)。电气特性方面:
适配伺服电机、变频电机的电流闭环控制:双向检测支持电机正反转,120kHz带宽与4μs响应时间可快速捕捉电机启动、调速时的电流波动,避免过流损坏,提升电机控制精度(如工业机器人关节电机)。
用于AC-DC、DC-DC转换器的输出电流监测:低损耗特性减少电源自身损耗,宽工作电压适配电源控制电路,可实现过载保护、输出电流调节、效率监测等功能(如服务器电源、LED驱动电源)。
应用于变频空调、滚筒洗衣机等设备的电机电流控制:-40℃~+150℃宽温范围可适应家电的工作环境温度变化(如空调室外机的低温/高温场景),保障设备稳定运行。
适配小型储能系统、电动自行车BMS(电池管理系统)的电流检测:双向检测支持电池充放电监测,高隔离电压保障电池系统与控制电路的安全隔离,避免高压串扰。
用于PLC(可编程逻辑控制器)的电流监测模块:隔离特性保障控制电路与工业现场高压电路的安全,宽温范围适应工业现场的温度变化(如车间控制柜、物流分拣设备)。
ACS725LLCTR-50AB-T依托ALLEGRO成熟的霍尔传感器技术,具备高可靠性:
该产品平衡了精度、隔离、体积与成本,是中功率电流监测场景的高性价比选择。
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