ACS755
电流传感器IC
这些部件正在生产中，但“不适用于新设计”或已属“最后一次购买的产品”（取决于当前范围、温度额定值以及封装类型）。该器件的销售目前仅限于现有客户应用。该器件不应该用于新设计应用，因为在不久的将来，它可能会被废弃。不再提供样品。状态变更日期：2009 年 5 月 4 日
Allegro 现正开发该产品系列的替代器件，预期将于 12 月 1 日发布。只有以下编号的部件将作为替代产品提供：
客户应在 Allegro 发布并生产新器件前向其分销商下达 LTB 订单，以将其生产要求传达 Allegro。Allegro 建议客户应通过以下“当该产品更新时通知我”按钮进行注册，以获取该产品页的更新信息。
功能及优点
- 高可靠性的单片霍尔 IC
- 单个 +5 V 电源
- 3 kVRMS 隔离电压： 端子 4/5 与管脚 1/2/3 之间，时间可达 1 分钟
- 18 kHz 带宽
- 汽车温度范围
- 下线工厂校准增益和偏移
- 超低功率损耗：100 μΩ 内部传导电阻
- 电源电压的成比例输出
- 极度稳定的输出偏移电压
- 小型封装尺寸，安装简便
- 输出与直流电流成比例
描述
Allegro ACS755 电流传感器 IC 系列为工业、汽车、商业和通信系统的直流电流感测提供经济实惠、的解决方案。该器件采用封装设计，便于客户使用。典型应用包括电动机控制、负载检测及管理、电源和过流保护。
该器件由一个低偏移的精密线性霍尔传感器电路组成，其铜制的电流路径靠近晶片的表面。流过该电流路径的电流会产生一个磁场，该磁场可被集成霍尔 IC 检测并转换成同比例的电压输出。通过将磁信号尽量接近霍尔传感器，器件的度已得到极大的优化。一个的成比例的电压由低偏移、斩波稳定的 BiCMOS 霍尔 IC 提供，并且该 IC 出厂前已对度设定。
当电流通过用作电流感测通路之铜传导主通路(从端子 4 到端子 5)时，器件输出将有效。该传导通路的内电阻通常是 100 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。电流路径的接线端与传感器引脚（引脚 1 到 3）之间电气隔离。这让 ACS755 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。大尺寸引脚框由无氧铜制成。
功能方框图
ACS755
Current Sensor ICs
DISCONTINUED PRODUCT. These parts are no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: May 3, 2010.
The following parts numbers are offered as replacements:
Features and Benefits
- Monolithic Hall IC for high reliability
- Single +5 V supply
- 3 kVRMS isolation voltage between terminals 4/5 and pins 1/2/3 for up to 1 minute
- 18 kHz bandwidth
- Automotive temperature range
- End-of-line factory-trimmed for gain and offset
- Ultra-low power loss: 100 μΩ internal conductor resistance
- Ratiometric output from supply voltage
- Extremely stable output offset voltage
- Small package size, with easy mounting capability
- Output proportional to DC currents
Description
The Allegro ACS755 family of current sensor ICs provides economical and precise solutions for 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 will be valid when a 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 100 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 ACS755 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