The Allegro™ ACS725 current sensor IC is an accurate and economical solution for AC/DC sensing in industrial, automotive, commercial, and communications systems. Small packages are ideal for applications where space is tight, and cost is reduced due to the reduced area of the board. Typical application areas include motor control, load detection and management, switching power supplies, and overcurrent fault protection.
The device features a precise, low-offset linear Hall sensor circuitry with copper conduction paths near the wafer surface. The applied current through this copper conduction path generates a magnetic field that can be sensed by the integrated Hall IC and converted into a proportional voltage. The current is sensed differentially in order to suppress the common-mode field and improve the measurement accuracy in magnetic noise environments. Optimize intrinsic device accuracy through the proximity of the magnetic field to the Hall sensor. The low-offset, chopper-stabilized BiCMOS Hall IC provides a precisely proportional voltage that is programmed for precision after packaging. The output of the device has a positive slope as the current increases through the primary copper conductor path (from pins 1 and 2 to pins 3 and 4), which is used for current sensing. The conventional internal resistance of this conduction path is 1.2mΩ, which has a low power loss.
The terminals of the conduction path are galvanically isolated from the sensor leads (pins 5-8). This allows the ACS725 current sensor to be used in high-level current sensing applications without the need for high-side differential amplifiers or other expensive isolation techniques.
The ACS725 features a small package mount, SOIC8, with a flat surface. The pin holders are 100% matte tin plated and are compatible with standard lead-free (Pb) printed circuit board assembly processes. The device is internally lead-free, with the exception of flip-chip high-temperature lead-based solder balls, which are currently RoHS exempt. The device is fully calibrated before being shipped from the factory.
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差分霍尔传感抑制共模场
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1.2 mΩ 一次导体，功率损失低，耐冲击电流容量大。
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集成屏蔽实际上消除了从电流导体至晶片的电容耦合，显著抑制了高 dv/dt 瞬变导致的输出噪声
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凭借专有放大器和过滤器设计技术，该器件具有业界领先的噪声性能，并且带宽也显著改善
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高带宽 120 KHz 模拟输出缩短了控制应用中的响应时间。
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滤波器引脚允许用户以更低的带宽过滤输出信号，以提高分辨率
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利用专利集成数字温度补偿电路，您可以在开环传感器中获得近似闭环的温度测量精确度。
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小型扁平 SOIC8 封装适合空间狭小应用
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过滤器引脚简化了带宽限制，可以在较低的频率获得更好的分辨率。
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3.3 V，单电源操作
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与交直流电流成正比的输出电压
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出厂时校准灵敏度和静态输出电压实现更高精确度
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稳定斩波实现极度稳定的静态输出电压
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近零的磁滞
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电源电压的成比例输出
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