What is MLX91221KDF-ABF-120-RE?
The low impedance leadframe of the SOIC package is where the MLX91221KDF-ABF-120-RE integrated current sensor detects the current flowing through it. Determining the current conductor’s position in relation to the monolithic CMOS sensor results in a fully integrated, factory-calibrated Hall-effect current sensor.
Two sets of Hall plates detect the magnetic flux density produced by the current flow in the package in a differential way. As a result, the quick analog front-end is less affected by external disruptive fields. After being amplified, the remaining signal produces a high-speed linear analog output voltage.
The close closeness of the Hall plates to the current conductor guarantees a great signal-to-noise ratio and an accurate signal over temperature. The primary and opposing secondary side leads of the package retain their high voltage isolation ratings in spite of this downsizing.
Table of Contents
Working Principle of MLX91221KDF-ABF-120-RE
Hall Effect Sensing:
With Hall Effect Sensing, an electric current passing through a conductor creates a magnetic field that the sensor measures. A magnetic field is produced around a conductor when an electric current flows through it, according to the Hall effect. The magnitude of the current directly relates to the strength of this magnetic field.
Magnetized Concentrator:
A magnetic concentrator built within the MLX91221 focuses the magnetic field on the Hall element. Because of this architecture, the sensor can detect tiny currents more accurately and with greater sensitivity.
Signal Handling:
The voltage produced by the Hall element is proportional to the magnetic field’s strength. The sensor’s inbuilt electronics subsequently process this analog signal. Typically, the processing produces a stable output proportional to the measured current by amplifying the Hall voltage.
Output:
Microcontrollers and other electronic devices can be easily interfaced with the analog output voltage that the sensor gives. This output voltage can be easily integrated into a variety of applications because it varies linearly with the current being measured.
Isolation:
The MLX91221 and other Hall effect sensors offer galvanic isolation between the sensor electronics and the conductor being measured, which is one of their main benefits. Safety demands this isolation, particularly in high-voltage applications.
Adjusting for Temperature:
The sensor is made to function reliably in a variety of environmental settings by maintaining precision over a broad temperature range (-40°C to +125°C).
The MLX91221KDF-ABF-120-RE’s feature set makes it appropriate for use in situations where accurate current measurement is crucial, such as power inverters, battery management systems, and electric motor control.
MLX91221KDF-ABF-120-RE Applications
The MLX91221KDF-ABF-120-RE has a lot of different applications use because of their excellent precision and dependability. These are the main uses:
Electric Vehicle (EV) Battery Management Systems (BMS): Monitoring and managing battery charge and discharge currents.
Electric Power Steering (EPS): Providing accurate current sensing for steering systems in vehicles.
Inverter/Converter Current Sensing: Essential for measuring current in power conversion systems.
Onboard Chargers: Used in electric vehicles to monitor charging currents.
DC-DC Converters: Measuring input and output currents for efficiency monitoring.
Motor Control Systems: Employed in electric motors for current feedback and control.
Uninterruptible Power Supplies (UPS): Monitoring current to ensure reliable power supply during outages.
Industrial Automation: Used in various industrial applications for precise current measurement.
Welding Equipment: Monitoring current during welding processes for quality control.
Renewable Energy Systems: Applied in solar inverters and wind energy systems to track current flow.
Smart Home Appliances: Integrated into devices for energy monitoring and management.
Power Tools and Battery-Powered Devices: Ensuring efficient power usage and battery management.
Energy Meters and Power Distribution Units (PDUs): Used for measuring and managing electrical energy consumption.
Electricity Substations: Monitoring current in power distribution systems.
Medical Imaging Equipment and Portable Medical Devices: Ensuring accurate current measurement for operational safety.
Smart Grid Monitoring: Facilitating efficient energy distribution and management.
These uses demonstrate the MLX91221KDF-ABF-120-RE’s adaptability and significance in contemporary electrical systems and devices across a range of sectors.
Primary Features of MLX91221KDF-ABF-120-RE
Exact Hall-effect current sensors, such as the MLX91221KDF-ABF-120-RE, are designed for a wide range of applications, primarily in the automotive and industrial domains. These are its primary attributes:
Current Measurement: It is capable of measuring both AC and DC currents, with a sensitivity of 62.5 mV/A.
Operating Temperature Range: This device works well in a wide temperature range of -40°C to +125°C, making it appropriate for harsh environments.
Supply Voltage: The voltage range within which it can function is 3.135-2.46V.
Response Time: The quick response time of 2 µs allows for timely detection of current.
Range of Frequency: It can accommodate various signal types with a frequency range of DC to 300 kHz.
Output Type: This type of output produces a fixed voltage that is commensurate to the detected current.
Package Type: This package is a 16-pin SOIC compact form that can be easily integrated into electrical designs.
Applications: Excellent for renewable energy systems, electric motor control, battery management systems, and power converters, among other things.
Overcurrent Detection: Integrated features that identify overcurrent conditions to increase the dependability and safety of applications.
These characteristics make the MLX91221KDF-ABF-120-RE a versatile and trustworthy choice for precise current sensing in challenging circumstances.
Advantages and Disadvantages of MLX91221KDF-ABF-120-RE
The MLX91221KDF-ABF-120-RE has numerous advantages, including superb accuracy (±1% full-scale), fast reaction time (<10 µs), and dependability suitable for an automotive setting. Its broad temperature range of -40°C to +150°C and ±120mT magnetic field make it perfect for demanding applications including motor control, power supply monitoring, and automotive current sensing. Its inherent temperature adjustment and small SOIC-8 footprint ensure consistent performance in a range of situations, making it the ideal option for designs with limited room.
However, the sensor has its limitations. Since it has an analog output and no digital interface like SPI or I2C, digital systems require an ADC. Furthermore, in noisy places, it may need external shielding even though it complies with EMC regulations. Because some pins are reserved for testing or future usage, the cost may be higher than for simpler sensors, and the flexibility may be reduced. Despite these drawbacks, the sensor is a fantastic choice for high-end applications because to its precision and quickness.
Equivalent Parts of MLX91221KDF-ABF-120-RE
A number of items that are comparable to the MLX91221KDF-ABF-120-RE are on hand and could be considered for comparable applications, depending on availability and specific design specifications. Due to their comparable features and specifications, these components make excellent replacements.
Some of the notable equivalents are:
MLX91221KDC-ABR-050-SP: Because it is made for high-precision current measurements and has a similar working temperature range and sensitivity, this component is a good replacement for the MLX91221KDF-ABF-120-RE in applications that need accurate current sensing.
MLX91221KDF-ABF-010-RE and MLX91221KDF-ABF-010-SP: Because they are less sensitive than the MLX91221KDF-ABF-120-RE, these components are suitable for applications with a range of current measurement needs.
MLX91221KDC ABF-025-TU and ABF-050-TU: Designers can select the ideal component for their specific design requirements from a variety of options due to differences in output and sensitivity properties.
The MLX91221KDF-TU ABF-050-TU and ABF-075-TU Because these components are designed for applications requiring medium and high current readings, respectively, they provide flexibility in selecting the ideal sensor for the task.
The parts MLX92211LUA-BAA-047-SP and MLX92211LUA-BAA-047-BU are good alternatives to the MLX91221KDF-ABF-120-RE due to their high precision and fit for many modern measuring applications.
MLX92211LSE-BAA-206-RE: In certain situations, this part may be used in place of the MLX91221KDF-ABF-120-RE due to its strong performance and design for a variety of industrial and automotive applications.
When selecting an equivalent part, it is important to consider factors including sensitivity, operating temperature range, supply voltage, and package type to ensure compatibility with the current design and meet the needs of the application.
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FAQs About MLX91221KDF-ABF-120-RE
What is the MLX91221KDF-ABF-120-RE’s main purpose?
The MLX91221KDF-ABF-120-RE is a Hall-effect current sensor designed for high-precision current measurements in various applications, including battery management systems, power inverters, and electric motor control.
What is the sensor’s operational temperature range?
Given that it performs well over a broad temperature range of -40°C to +125°C, the sensor may find usage in demanding automotive and industrial applications.
What kind of output is produced by the MLX91221KDF-ABF-120-RE?
The sensor provides an analog output proportionate to the measured current, which facilitates easy interfacing with microcontrollers and other signal processing equipment.
What is the MLX91221KDF-ABF-120-RE’s required supply voltage?
The sensor is often powered by a 3.3V supply voltage, which is common in automotive and industrial settings.
Can both AC and DC currents be measured by the MLX91221KDF-ABF-120-RE?
The fact that the MLX91221KDF-ABF-120-RE can measure both AC and DC currents makes it versatile for a variety of applications.
What is the highest current that the sensor is capable of measuring?
Although the sensor is designed for high-precision readings, it can monitor currents up to 20A depending on the configuration and application.
Is high-voltage application suitable for the MLX91221KDF-ABF-120-RE?
Given that it is designed to offer isolation, which helps prevent high voltage surges, the sensor is suitable for high-voltage applications.
What are the MLX91221KDF-ABF-120-RE’s main benefits?
Among the advantages are high precision, wide measurement range, low noise, small form factor, integrated overcurrent detection, and automotive-grade quality.
What is the difference between the MLX91221KDF-ABF-120-RE and other available sensors?
The MLX91221KDF-ABF-120-RE is distinguished from other Hall-effect sensors and traditional shunt resistors by virtue of its superior precision, wide temperature range of operation, and non-invasive measurement capabilities.
Where can I locate the MLX91221KDF-ABF-120-RE datasheet?
Applications notes, pin configurations, and detailed specs are all included in the datasheet, which is often available via the manufacturer’s website or through authorized dealers.
