Allegro MicroSystems ACS37100 10MHz TMR Current Sensor
Allegro Microsystems ACS37100 10MHz TMR Current Sensor is factory-trimmed to provide high accuracy over the entire operating range, eliminating the need for user programming. The internal construction provides a high isolation by magnetically coupling the field generated by current flow in the conductor to the monolithic tunneling magnetoresistance (TMR) IC. The current is sensed differentially by two TMR bridges, which subtract out interfering common-mode magnetic fields. The IC has no physical connection to the integrated current conductor and delivers a 5000VRMS isolation voltage between the primary signal leads. This high rating provides a basic working voltage of 1097VRMS (MA package) between the primary and secondary signal leads of the package. The SOICW-16 MA package features a conductor resistance of 1.2mΩ.
The ACS37100 from Allegro Microsystems integrates a fast, adjustable overcurrent fault feature, which provides hardware short-circuit detection for system protection. The device also features a voltage reference output (VREF) that provides a stable voltage corresponding to the 0A output voltage, enabling differential measurements of the output.
Features
- TMR sensing element
- High operating bandwidth for fast control loops or where high-speed switching currents are monitored
- DC to 10MHz bandwidth
- 50ns typical response time
- High accuracy and low noise
- ±2% sensitivity error over temperature
- ±8mV maximum offset voltage over temperature
- 26mARMS input referred noise
- 3.3V non-ratiometric supply operation
- Multiple gain options available
- Differential sensing immune to external magnetic fields
- VREF output voltage for differential routing in noisy application environments
- Overcurrent FAULT output with adjustable FAULT threshold for fast open-drain overcurrent detection
- UL-certified, highly isolated compact surface-mount packages
- Available in 16-pin SOICW package (8mm creepage)
- -40°C to +150°C operating temperature ramge
- Grade 0, AEC-Q100 automotive qualified
Applications
- Onboard chargers
- DC-DC converters
- Server power
- C&I solar string inverters
- DC EV charging
Videos
Functional Block Diagram
Development Tools
Allegro MicroSystems ACSEVB-MA16-LA16 Evaluation Board
Evaluates Allegro current sensors in a lab environment without needing a custom circuit board.
Mikroe Current 15 Click
Based on ACS37100 TMR current sensor for bidirectional current measurement in embedded applications.