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Blog

High-Side Vs. Low-Side Current Sensing: Why Placement Matters New

Learn the design tradeoffs of current sensor placement. Evaluate isolation, cost, and fault detection across low-side, high-side, and in-line topologies.

Technical Article

Deconstructing Current Sensor Accuracy Understanding Dynamic and Environmental Errors

Master real-world current sensor accuracy. Learn how environmental drift, supply noise, and physical stress impact sensitivity and offset errors.

Application Note

PCB Ground Plane Optimization for Coreless Current Sensor Applications

AN296277 - This application note provides guidelines on how a PCB ground plane around the sensor location should be designed to achieve optimum performances.

Application Note

New Approaches to High-Efficiency Current Sensing: Integrated Hall Sensor ICs Save Power and Space

AN296100: Allegro current sensor ICs allow design engineers to use Hall-effect based current sensor ICs in new applications where increased energy efficiency or new operating features are required. Wherever current sensing is needed, an integrated Hall-effect IC can provide a solution.

Application Note

Current Sensing for Power Delivery

AN296256 - This article will discuss the advantages of various current sensing methods in power delivery.

Video

ACS780 & ACS781: High Current Density Fully Integrated Current Sensor ICs

Allegro’s new family of fully integrated current sensor linear ICs in a new core-less package designed to sense AC and DC currents up to 100 A.

Video

ACS712 Low-Noise 2100 VRMS Hall-Effect Current Sensor IC

The Allegro ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection.

Application Note

Advantages of Filters on the Input and Output Terminals of the Current-Sense Amplifier

AN296384 - This application note provides recommendations for the use of filters on the input and output terminals of the current-sense amplifiers in Allegro motor-gate drivers.

Application Note

Improved Performance and Features of Allegro’s Next Generation, High Power Density CB Package Current Sensors

This application note will describe the use of the new high current ACS772 Hall-effect current sensor integrated circuit (IC) from Allegro MicroSystems and will give an overview of its features and improvements from previous Allegro high-current sensors.

Application Note

Improving Efficiency in Smart Grid Applications With Fully Integrated Current Sensing ICs

With increasing concerns about the global demand for energy and environmental awareness, power electronics applications are under pressure to improve efficiency.

Technical Article

Hall Effect Current Sensing in Hybrid Electric Vehicle (HEV) Applications 

This note provides an understanding of hybrid electric vehicle (HEV) power systems and the contribution Hall-effect sensing technology can provide to improving the performance and cost-effectiveness of these systems.

Application Note

Secrets of Measuring Currents Above 50 Amps

It can be challenging to sense currents exceeding 50 A because the task often involves thermal management, must take place in a limited PCB area, and in some cases, requires a voltage isolation device. Two widely used methods for sensing high currents are a sense-resistor/op-amp approach, and Hall-based current sensing.

Technical Article

Crank Sensor IC for Stop-Start

This article describes start-stop operation and enabling Hall-effect integrated circuits, in particular the Allegro MicroSystems ATS694 and the previous generation ATS658, which are used in this application.

Application Note

A Micro-Packaged Linear Current Sensor IC

Traditionally, current sensing has been accomplished with sense resistors or current transformers that can take up a large PCB area. Sense resistor values from 10 to 50 mΩ can burn a significant amount of power at higher currents.

Technical Article

Overcoming Size Challenges in PCB Design with Magnetic Current Sensors

Magnetic current sensors provide a compact and efficient alternative to traditional current measurement techniques that significantly reduce the size of components on PCBs.

Application Note

Techniques to Minimize Common-Mode Field Interference When Using Allegro Current Sensor ICs (ACS724 and ACS780)

This application note will discuss the mechanism of CMR and focus on how to best use this mechanism through optimized circuit board design and layout for sensors that need an external magnetic core, sensors that have a core built into the package, and sensors that have an integrated current-carrying loop but no core.

Application Note

Shifting the Offset Voltage of Current Sensors

Most of the Allegro™ unidirectional current sensor ICs are trimmed such that the zero ampere output is at 0.1 × VCC . The advantage of having the output voltage at 0.1 × VCC  is that the output can swing slightly lower than this value before saturating.

Application Note

Hysteresis Mitigation in Current Sensor ICs Using Ferromagnetic Cores

AN269114 - Traditional open-loop current sensor ICs, like the Allegro ACS758CB and ACS770CB families, have ferromagnetic cores that act as magnetic concentrators. They concentrate the magnetic flux density, the B field, generated by current flowing through a conductor onto the Hall-effect sensor IC.

Application Note

Hall Effect Current Sensing in Electric and Hybrid Vehicles

Improved energy efficiency in HEVs and EVs can be attained by using electrically-driven actuators instead of belt-driven and hydraulic actuators. For instance, in traditional internal combustion engines a fan belt drives the cooling fan, which operates continuously while the engine is running.

Application Note

Guidelines for Designing a Concentrator for High-Current Sensing Applications with an Allegro Hall-Effect Sensor IC

A concentrator focuses magnetic flux lines, which are generated by electrical current flowing through a conductor, at the center of the air gap, where the Hall-effect magnetic sensor IC is positioned.

Technical Article

Current Sensing For Renewable Energy

In grid-tied photovoltaic systems, designers must focus on minimizing cost per watt to deliver the best possible return on investment.

Application Note

Differential Current Sensing with the 1 MHz Bandwidth ACS733

AN296154 - This application note describes the use of the new highly isolated, high bandwidth ACS733 Hall-effect current sensor integrated circuit (IC) from Allegro MicroSystems and gives an overview of its features and advantages over a highspeed current transformer (CT) current sensing solution.

Application Note

DC Current Capability and Fuse Characteristics of Current Sensor ICs with 50 to 200 A Measurement Capability

Allegro MicroSystems offers a wide range of current sensor IC solutions that fall into two main categories: ICs having an integrated current-carrying conductor and ICs designed to be used with an external magnetic core.

Application Note

Using Allegro Current Sensor ICs in Current Divider Configurations for Extended Measurement Range

This application note describes simple methods for increasing the measurable current range. These methods involve splitting the path of the current being sensed. Various options of devices and circuits are described.

Application Note

AN295045- Recent Trends in Hall-Effect Current Sensing

This paper presents recent advances in integrated Halleffect–based current sensor ICs. It covers the various packaging concepts for integrating the primary current path into the system, the major improvements in IC parameters, as well as a few examples of typical application circuits for uninterruptible power supplies (UPS), inverters, and battery ...

Application Note

Voltage Isolation in Variable Frequency Drives

AN296117 - This applications note, while not designed to be a comprehensive analysis of voltage isolation standards, introduces various Allegro current sensor integrated circuit (IC) packages that can be used to achieve high isolation ratings that meet industry standards.

Application Note

Non-Intrusive Hall-Effect Current-Sensing Techniques Provide Safe, Reliable Detection and Protection for Power Electronics

As systems extend and expand the exploitation of the latest power semiconductors (IGBTs, MCTs, etc.) that manifest the very relentless advance in power output limits, a prerequisite (and parallel) demand for sensing these escalating current levels is (increasingly) very apparent.

Application Note

Allegro MicroSystems - New Approaches to High Efficiency Current Sensing Hall Sensor ICs Save Power and Space

Recent advancements in integrated Hall-effect current sensor technology provide an alternative current sensing solution that reduces power loss, achieves most cost targets, and occupies a much smaller volume on the application printed circuit board, current sense resistor.

Application Note

Material Selection and Geometry Considerations for High Current Sensing Magnetic Flux Concentrator Designs

AN296245 - Core material selection, geometry, and air gap dimensions will all impact the performance of the flux concentrator. This note will explain each of these factors and provide a detailed guide for design of a magnetic flux concentrator.

Application Note

ACS37600 Reference PCB Design for Current Sensing Module Applications

AN296205 - The aim of this document is to provide guidelines for designing a PCB for the ACS37600 while minimizing possible undershoots/overshoots due to a fast current step response.

Application Note

ACS37610 Busbar Geometry and Design Techniques for Coreless Differential Current Sensors

AN296194 - The purpose of this application note is to offer guidelines for selecting the optimum combination of ACS37610 and busbar geometry for a given current sensor application and its specific requirements.

Brochure

Brochure: Current Sensing for Vehicle Electrification

Charge into the future of vehicle electrification with the world's #1 supplier of current sensor ICs for leading EV applications.

Brochure

Brochure: Solar Energy Harvesting

Allegro’s current sensor ICs are ideal for use with solar applications, which include electronic subsystems like solar combiner boxes, DC/DC converters for maximum power point tracking (MPPT), and DC-AC inverters.

Brochure

Brochure: Integrated Power Monitoring with the ACS37800

Allegro’s ACS37800 offers its customers the capability to easily monitor and optimize the energy efficiency of power supplies, lighting, and motor control sub-systems in connected building automation solutions while simplifying the system design.

Application Note

Understanding Linearity Error for the ACS70310 Above 2000 G

AN296206 - The goal of this application note is to illustrate and discuss the linearity error of the ACS70310 when sensing fields greater than 2000 G.