High-side, Low-side Current Sensing - ICs, Circuit Diagram & Design

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Accurate current sensing is used in a wide variety of applications where the current is either regulated as part of a feedback loop – in a switched mode power supply (SMPS), for example, or a to control torque and speed in a motor driver - or controlled to detect levels that could be critical or dangerous for the system and implement appropriate over-current protections.

Very often current sensing is performed by measuring the voltage drop developed across shunt-resistors that can be connected to ground (low-side sensing) or to the supply rail (high-side sensing).

ST provides a range of solutions to help engineers implement high-efficiency and accurate current sensing applications including current-sense amplifiers, high-precision operational amplifiers and comparators.

Current Sensing

Operational Amplifiers

型号	描述
STEVAL-ISQ014V1	Low-side current sensing evaluation board based on the TSZ121 op amp	Quick view 主要特性 Very high accuracy: offset voltage 5 μV max at 25 °C, 8 μV over full temperature range (-40 °C to 125 °C) Rail-to-rail input and output Low supply voltage: 1.8 - 5.5 V Low power consumption: 40 μA max. at 5 V Gain bandwidth product: 400 kHz High tolerance to ESD: 4 kV HBM Extended temperature range: -40 to +125 °C Micro-packages: SC70-5 (TSZ121), DFN8 2x2 (TSZ122), and QFN16 3x3 (TSZ124) RoHS compliant Show More Product Details Download databrief IMAGE FEATURED RESOURCES Schematics BOM Gerber
STEVAL-LDO001V1	Quad high performance LDO evaluation board based on LDBL20, LDLN025, LD39130S and STLQ020	Quick view 主要特性 Multi LDO evaluation board based on four high performance low dropout linear voltage regulators in miniature packages Key features: Low operating input voltage (from 1.4 V to 5.5 V) Current capability from 200 mA to 300 mA Low dropout (down to 160 mV typ.) Ultra-low quiescent current (down to 500 nA typ.) Low noise (down to 6.5 μVRMS typ.) High PSSR (up to 80 dB) Logic controlled electronic shutdown (enable) Tiny packages (DFN-6L, Flip-chip, ST STAMP™) RoHS compliant Show More Product Details Download databrief IMAGE FEATURED RESOURCES Schematics BOM Gerber
X-NUCLEO-IKA01A1	Multifunctional expansion board based on operational amplifiers for STM32 Nucleo	Quick view 主要特性 7 predefined configurations: Instrumentation amplifier structure Current sensing with or without USB Photodiode/ultraviolet (UV) current sensing Buffer Full wave rectifier Constant current LED driver Window comparator One prototyping area Compatible with STM32 Nucleo boards Comprehensive free development firmware library (X-CUBE-ANALOG1) Powered through the Arduino UNO connectors RoHS compliant Show More Product Details Download databrief IMAGE FEATURED RESOURCES Schematics BOM Gerber
STEVAL-ISQ013V1	Low side current sensing based on TS507	Quick view 主要特性 Ultra low offset voltage: 25 μV typ, 100 μV max Rail-to-rail input/output voltage swing Operating from 2.7 V to 5.5 V High speed: 1.9 MHz 45° phase margin with 100 pF Low consumption: 0.8 mA at 2.7 V Very large signal voltage gain: 131 dB High power supply rejection ratio: 105 dB Very high ESD protection 5 kV (HBM) Latch-up immunity RoHS compliant Show More Product Details Download databrief IMAGE FEATURED RESOURCES Schematics BOM Gerber
STM32373C-EVAL	Evaluation board with STM32F373VC MCU	Quick view 主要特性 STM32F373VCT6 microcontroller Four 5 V power supply options: Power jack ST-LINK/V2 USB connector User USB connector Daughter board Audio jack connected to I² S DAC Microphone connected to ADC through an amplifier 2-GByte (or more) MicroSD card on SPI Three components on I² C bus: temperature sensor, EEPROM and dual interface RF EEPROM RS-232 communication configurable for communication of Flash loader IrDA transceiver 240x320 TFT color LCD connected to SPI interface Joystick with 4-direction control and selector Reset, Wakeup or Tamper, and Key buttons 4 color user LEDs 2 LEDs for MCU power range indicator ECG, pressure sensor and PT100 temperature sensor connected to the 16-bit Sigma Delta ADC of STM32F373VCT6 Extension connectors for daughter board or wrapping board MCU voltage: 3.3 V or adjustable 2.0 V - 3.6 V USB FS connector Touch slider RTC with backup battery CAN 2.0 A/B compliant connection Light dependent resistor (LDR) Two HDMI connectors with DDC and CEC IR transmitter and receiver Two ADC & DAC input and output signal connectors and one Sigma Delta ADC input signal connector Potentiometer JTAG/SWD and ETM trace debug support Embedded ST-LINK/V2 Show More Product Details Download databrief IMAGE FEATURED RESOURCES Schematics BOM Gerber

型号

STEVAL-ISQ014V1

Low-side current sensing evaluation board based on the TSZ121 op amp

Quick view

主要特性

Very high accuracy: offset voltage 5 μV max at 25 °C, 8 μV over full temperature range (-40 °C to 125 °C)
Rail-to-rail input and output
Low supply voltage: 1.8 - 5.5 V
Low power consumption: 40 μA max. at 5 V
Gain bandwidth product: 400 kHz
High tolerance to ESD: 4 kV HBM
Extended temperature range: -40 to +125 °C
Micro-packages: SC70-5 (TSZ121), DFN8 2x2 (TSZ122), and QFN16 3x3 (TSZ124)
RoHS compliant

Product Details Download databrief

IMAGE

FEATURED RESOURCES

Schematics BOM Gerber

STEVAL-LDO001V1

Quad high performance LDO evaluation board based on LDBL20, LDLN025, LD39130S and STLQ020

Quick view

主要特性

Multi LDO evaluation board based on four high performance low dropout linear voltage regulators in miniature packages
Key features:
- Low operating input voltage (from 1.4 V to 5.5 V)
- Current capability from 200 mA to 300 mA
- Low dropout (down to 160 mV typ.)
- Ultra-low quiescent current (down to 500 nA typ.)
- Low noise (down to 6.5 μVRMS typ.)
- High PSSR (up to 80 dB)
- Logic controlled electronic shutdown (enable)
- Tiny packages (DFN-6L, Flip-chip, ST STAMP™)
RoHS compliant

Product Details Download databrief

IMAGE

FEATURED RESOURCES

Schematics BOM Gerber

X-NUCLEO-IKA01A1

Multifunctional expansion board based on operational amplifiers for STM32 Nucleo

Quick view

主要特性

7 predefined configurations:
- Instrumentation amplifier structure
- Current sensing with or without USB
- Photodiode/ultraviolet (UV) current sensing
- Buffer
- Full wave rectifier
- Constant current LED driver
- Window comparator
One prototyping area
Compatible with STM32 Nucleo boards
Comprehensive free development firmware library (X-CUBE-ANALOG1)
Powered through the Arduino UNO connectors
RoHS compliant

Product Details Download databrief

IMAGE

FEATURED RESOURCES

Schematics BOM Gerber

STEVAL-ISQ013V1

Low side current sensing based on TS507

Quick view

主要特性

Ultra low offset voltage: 25 μV typ, 100 μV max
Rail-to-rail input/output voltage swing
Operating from 2.7 V to 5.5 V
High speed: 1.9 MHz
45° phase margin with 100 pF
Low consumption: 0.8 mA at 2.7 V
Very large signal voltage gain: 131 dB
High power supply rejection ratio: 105 dB
Very high ESD protection 5 kV (HBM)
Latch-up immunity
RoHS compliant

Product Details Download databrief

IMAGE

FEATURED RESOURCES

Schematics BOM Gerber

STM32373C-EVAL

Evaluation board with STM32F373VC MCU

Quick view

主要特性

STM32F373VCT6 microcontroller
Four 5 V power supply options:
- Power jack
- ST-LINK/V2 USB connector
- User USB connector
- Daughter board
Audio jack connected to I² S DAC
Microphone connected to ADC through an amplifier
2-GByte (or more) MicroSD card on SPI
Three components on I² C bus: temperature sensor, EEPROM and dual interface RF EEPROM
RS-232 communication configurable for communication of Flash loader
IrDA transceiver
240x320 TFT color LCD connected to SPI interface
Joystick with 4-direction control and selector
Reset, Wakeup or Tamper, and Key buttons
4 color user LEDs
2 LEDs for MCU power range indicator
ECG, pressure sensor and PT100 temperature sensor connected to the 16-bit Sigma Delta ADC of STM32F373VCT6
Extension connectors for daughter board or wrapping board
MCU voltage: 3.3 V or adjustable 2.0 V - 3.6 V
USB FS connector
Touch slider
RTC with backup battery
CAN 2.0 A/B compliant connection
Light dependent resistor (LDR)
Two HDMI connectors with DDC and CEC
IR transmitter and receiver
Two ADC & DAC input and output signal connectors and one Sigma Delta ADC input signal connector
Potentiometer
JTAG/SWD and ETM trace debug support
Embedded ST-LINK/V2

Product Details Download databrief

IMAGE

FEATURED RESOURCES

Schematics BOM Gerber

00 Files selected for download

技术文档

应用手册

描述	版本	文档大小	Action
AN4369 Adjustable gain with a current sensing	2.0	632.09 KB	PDF
AN4366 Compensate the input offset of a high-side current sensing	1.0	280.34 KB	PDF
AN4835 High-side current sensing for applications using high common-mode voltage	1.0	657.19 KB	PDF
AN4304 How to filter the input of a high-side current sensing	1.0	528.94 KB	PDF

AN4369

Adjustable gain with a current sensing

PDF

AN4366

Compensate the input offset of a high-side current sensing

PDF

AN4835

High-side current sensing for applications using high common-mode voltage

PDF

AN4304

How to filter the input of a high-side current sensing

PDF

Amplifiers and Comparators

型号	描述
CS30	High side current sense high voltage op amp
TSC101	High side current sense amplifier
TSC102	High side current sense amplifier plus signal conditioning amplifier
TSC888	Low cost high-side current sense amplifier
TSV731	High accuracy (Vio below 200uV) Micropower (60uA) 5V CMOS Op Amp, single, GBP 900kHz
TSX711	Precision (200uV), rail-to-rail 16V CMOS Op-Amp, single, GBP 2.7MHz
TSZ121	Very high accuracy (5 uV) zero drift 5 V CMOS Op-Amp, single, GBP=400kHz