Current Sense Amplifiers

Overview
Products
Technical Documentation
The portfolio of Current Sense Amplifiers from ON Semiconductor includes a variety of voltage output, current-sense amplifiers, and current-shunt monitors that can measure the voltage across shunts at common−mode voltages from −0.3 V to 26 V, independent of the supply voltage. These Current Sense Amplifiers minimize BOM space and allow for system flexibility. They are low-cost, highly accurate, power-efficient, and offer minimal impact to battery life. Applications include Power Monitoring, Power Adapters, LED Power Supply, Over Current Protection, Closed Loop Feedback Circuits and Feedback Control Loops, Current Sensing (High-Side/Low-Side), External AC-DC Merchant Power Supply, Wireless Communications, and DSC among others. The portfolio also includes AEC-Q101 Qualified and PPAP Capable options specifically engineered and qualified for automotive industry applications.

Product Family

Standard Common Mode Amplifiers

ON Semiconductor's portfolio of current sense amplifiers with common mode voltage up to 26 V.

High Common Mode Amplifiers

ON Semiconductor's portfolio of current sense amplifiers with common mode voltage up to 80 V.

Automotive Current Sense Amplifiers

ON Semiconductor's portfolio of automtoive qualified current sense amplifiers.

Featured New Products

NCS7041: Current Sense Amplifier, 80 V Common-Mode Voltage, Bidirectional
  • Gain Bandwidth: 100 kHz
  • Input Offset Voltage: ±300 µV
  • High CMRR of 90 dB
  • Automotive qualified options are available under NCV prefix

Videos

Energy Infrastructure | Solutions for EV Charging Stations

Learn more about ON Semiconductor solutions for EV charging stations. As electric vehicles are becoming more popular, the deployment of EV charging stations need to catch up and even surpass the speed at which EVs are growing.

Energy Infrastructure | Solutions for Solar Inverters

Learn more about ON Semiconductor solutions for solar inverters. Governments across the world are setting policies to increase the use of renewable energy, thus the solar market is expereincing rapid growth with no signs of slowing down.

Solutions for High Voltage Drives Part 1

Learn more about ON Semiconductor solutions for high voltage drives. This is part 1 of a 2 part series.

Solutions for High Voltage Drives Part 2

Learn more about ON Semiconductor solutions for high voltage drives. This is part 2 of a 2 part series.

How to Protect Circuits from Overcurrent Spikes

Circuits that have overcurrent spikes pose a danger to your whole applications, and possibly the people around it. Here we show how to prevent this danger from occurring.

Product Resources

Application Note

Current Sense Amplifiers, Frequently Asked Questions (FAQ)

The following questions are typical questions that ON Semiconductor’s application support team answers on the topic of current sense amplifiers.

Blog

Current Sense Amplifier Shunt Connections Part 1

Diagnosing Shunt Resistor Connection Errors. This blog is the first in a three part blog series where we will discuss how to make accurate shunt resistor connections for optimum performance with ON Semiconductor current sense amplifiers (CSAs), such as the NCS21xR series and the NCS199AxR series.

Blog

Current Sense Amplifier Shunt Connections Part 2

Making Accurate Shunt Resistor Connections. This blog is the second in a three part series on the topic of making accurate shunt resistor connections. Today, we are going to discuss shunt resistor design architecture and shunt resistor manufacturer’s typical recommended guidelines for connecting to their shunts.

Blog

Current Sense Amplifier Shunt Connections Part 3

Good vs Bad Shunt Resistor Connections. This blog is the last blog in a three part series on the topic of shunt resistor connections. Today, we are going to look at the shunt resistor connection of a PCB design and compare measurement accuracy data between a PCB with a good connection and a PCB with a bad connection.

Blog

Current Sensing Solutions for Powertrain Systems

ON Semiconductor is well positioned to provide a complete system solution for vehicle electrification including electric charging and powertrain systems. As we continue to see success in this application space, we would like to shine the spotlight on some of the functions such as current and voltage sensing.

Blog

Current Sensing Solutions

Today’s electronics incorporate a lot more functionality compared to ten years ago. Engineers are pushed to design sophisticated systems and often times get “creative” to meet stringent power budgets in order to remain energy efficient. Predictive system maintenance and protection require fast acting system responses.

Blog

Current Sense Amplifiers: Remote Current Sensing Configuration

In this blog, we will discuss how to configure the NCS21xR and NCS199AxR current sense amplifiers so that they output a precision current. In some applications the system data readout board is remotely located from the circuit that monitors and measures the system current.

Blog

Current Sense Amplifiers: Input and Output Filtering

Filtering at the input or output of a current sense amplifier may be required for several different reasons. Today we will focus on implementing filter circuits with the NCS21xR and NCS199AxR current sense amplifiers when really small shunt resistors are used, 1 mΩ or less.

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