Low side current monitoring sample circuit from Analog Devices. Link here (PDF) The circuit monitors current in individual channels of −48 V to better than 1% accuracy. The load current passes through a shunt resistor, which is external to the circuit. The shunt resistor value is chosen so that the shunt voltage is approximately 50 […]
Tag Archives: Current sense
App note: Current sensing with low-voltage precision op-amps
Renesas’ app note on their low-voltage precision op-amps ISL28x3x measuring current implementation. Link here (PDF) Sensing and controlling current flow is a fundamental requirement in electronics systems. This application note explains the design of low-side and high-side current sensing circuits using the ISL28x3x family of low-voltage precision op-amps in combination with current sense resistors.
App note: Method of suppressing increase in surface temperature of shunt resistors
App note from ROHM Semiconductor about their shunt resistor mounting designs to keep heat away. Link here (PDF) Shunt resistors are widely used for current sensing in automotive and industrial applications. In the automotive sector, as vehicles become more complex and the number of motors and ECUs grows, applications need to be configured in a […]
App note: Effect of PCB design on temperature coefficient of resistance
App note from ROHM Semiconductor on the importance of sense trace/line arrangement on PCB designs. Link here (PDF) While resistance, power rating and size are important considerations when using shunt resistors, tolerances that affect the accuracy of the detected voltage must also be considered. These tolerances include the temperature coefficient of resistance and the tolerance […]
App note: High-side current sensing for applications using high common-mode voltage
App note from STMicroelectronics. Link here (PDF) This application note explains how to extend the common input voltage range of a standard operational amplifier (op amp) to realize a high-side current sensing.
App note: Current Sense Amplifiers, FAQs
FAQs answered by ON Semiconductor’s application support team on the topic of current sense amplifiers. Link here (PDF)
App note: Current sense amplifiers in class-D audio subsystems
App note from Texas Instruments about output current sensing in class-D amplfiers. Link here (PDF) Current sensing in audio subsystems are widely used in conjunction with CLASS-D amplifiers for diagnostics or to provide speaker current feedback to the DSP for speaker enhancement to emulate smartamp. The most expensive component in the audio subsystem is the […]
App note: Current-sense amplifier doubles as a high common mode instrumentation amplifier
Application note from Maxim intergrated on utilizing a boost converter and a current-sense amplifier to form a regulator that derives +5V from -48V without isolation. Link here (PDF) Instrumentation amplifiers (IAs) are used where gain accuracy and dc precision are important, such as in measurement and test equipment. The downside of IAs is the cost. […]
App note: Novel current-sense measurement with automatic offset correction
Silicon Labs’ application note about a low power current measurement circuit using TS1001 nano power op-amp paired with low-power CY8C38 microcontroller, Link here (PDF) Pairing a simple circuit using nanopower analog op amps with a microcontroller can monitor single battery cells and solar harvesters. Pairing up a 0.65 V/1 µA nanopower op amp with the […]
App note: Selection of three locations of current sense resistor in buck converter
Sensing current utilizing MOSFET’s Rds(on) and Inductor’s DCR in different location discussed in this app note from Alpha and Omega semiconductor. Link here (PDF) In current mode converters, current sense resistor can be placed in three locations: input loop, output loop and freewheeling loop. The pros and cons are discussed in details. The principles and […]
App note: Common-Mode transients in current sense applications
Transient considerations in current sensing especially in motor and solenoids, app note(PDF) from Analog Devices. Current sense amplifiers are used in a variety of applications, such as motor or solenoid control, load current monitoring, and fault detection. In such applications, it is typical for the input common-mode voltage to swing from ground to a certain […]
app note: A simple current-sense technique eliminating a sense resistor
An old but interesting app note(PDF) from Microsemi on resistorless current-sensing technique. This application note introduces a simple current-sense technique that eliminates that sense resistor, resulting in system-cost reduction, PCB space saving, and power efficiency improvement. Furthermore, the new current sensing mechanism allows higher dynamic tripping current than the static one (built-in low-pass filtering) to […]
App note: Current sense circuit collection
Here’s a current sense circuit collection from Linear Technology. The collection is organized by application type and for each one there are a few example circuits. High side, low side, level shifting, high and low voltage, fault sensing, etc: Sensing and/or controlling current flow is a fundamental requirement in many electronics systems, and the techniques […]