ACS756
带3 kVRMS 电压绝缘及低电阻电流导体的全集成、基于霍尔效应的线性电流传感器 IC

功能及优点

• 通过专利放大器和滤波器设计工艺实现行业的噪音性能
• 总输出误差为 .8%（当 T_A = 25°C时）
• 小型封装尺寸，安装简便
• 高可靠性的单片霍尔 IC
• 超低功率损耗：130 μΩ 内部传导电阻
• 3 kVRMS 绝缘电压（1-3号引脚与4-5号引脚之间）
• 3.0 至 5.0 V, 单电源操作
• 3 μs 输出上升时间，对应步进输入电流
• 20 或 40 mV/A 输出灵敏度
• 输出电压与交流或直流电流成比例
• 出厂时度校准
• 极稳定的输出偏置电压
• 近零的磁滞

描述

Allegro ACS756电流传感器 IC 系列为工业、汽车、商业和通信系统的交流或直流电流感应提供经济实惠和的解决方案。该器件的封装便于客户轻松实施。典型应用包括电动机控制、载荷检测和管理、电源和过流保护。

该器件由一个的、低偏移的线性霍尔传感器电路组成，且其铜制的电流路径靠近晶片。通过该铜制电流路径施加的电流能够生成可被集成霍尔 IC 感应并转化为成比例电压的磁场。通过将磁性信号靠近霍尔传感器，实现器件度优化。的、成比例电压由稳定斩波型低偏置 BiCMOS 霍尔 IC 提供，该 IC 出厂时已进行度编程。

当通过用作电流感测通路之主要铜传导通路（从端子 4 到端子 5）的电流不断上升时，器件的输出具有正斜率 (>V_CC / 2) 。该传导通路的内电阻通常是 130  μΩ，具有较低的功率损耗。

铜线的尺寸允许器件在高达 5× 的过电流条件下运行。传导通路的接线端与传感器引脚（引脚 1 到 3）电气绝缘。这让 ACS756 传感器 IC 系列可用于那些要求电气绝缘却未使用光电绝缘器或其它昂贵绝缘技术的应用。

器件在出厂装运前已完全校准。ACS75x 系列是无铅产品。所有的引脚均镀以 100% 雾锡，封装内无任何铅存在。大量规引脚框是由无氧铜制造。

功能方框图

ACS756
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor

Features and Benefits

• Industry-leading noise performance through proprietary amplifier and filter design techniques
• Total output error 0.8% at T_A = 25°C
• Small package size, with easy mounting capability
• Monolithic Hall IC for high reliability
• Ultra-low power loss: 130 μΩ internal conductor resistance
• 3 kVRMS minimum isolation voltage from pins 1-3 to pins 4-5
• 3.0 to 5.0 V, single supply operation
• 3 μs output rise time in response to step input current
• 20 or 40 mV/A output sensitivity
• Output voltage proportional to AC or DC currents
• Factory-trimmed for accuracy
• Extremely stable output offset voltage
• Nearly zero magnetic hysteresis

Description

The Allegro ACS756 family of current sensor ICs provides economical and precise solutions for AC or DC current sensing in industrial, automotive, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, power supplies, and overcurrent fault protection.

The device consists of a precision, low-offset linear Hall sensor circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the factory.

The output of the device has a positive slope (>V_CC / 2) when an increasing current flows through the primary copper conduction path (from terminal 4 to terminal 5), which is the path used for current sensing. The internal resistance of this conductive path is 130 μΩ typical, providing low power loss.

The thickness of the copper conductor allows survival of the device at up to 5× overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 1 through 3). This allows the ACS756 family of sensor ICs to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.

The device is fully calibrated prior to shipment from the factory. The ACS75x family is lead (Pb) free. All leads are plated with 100% matte tin, and there is no Pb inside the package. The heavy gauge leadframe is made of oxygen-free copper.

Functional Block Diagram