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« Hall Effect-Based Current Sensor ICs Applications
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- Allegro | Applications Note | Hall Effect-Based Current Sensor ICs Applications.
Current Sensing Solutions
for Energy Efficient Markets
Renewable EnergyInverters / Metering
Hybrid Vehicles
Energy Efficient Appliancesand Motor Control
ACS712/135 to 50 A Sensor ICs
ACS75X Family50 to 200 A Sensor ICs
High Bandwidth, Low NoiseSIP Packaged Sensor ICs
Hall Effect Basics
VH = -IB / d n eB = flux density
d = plate thickness
e = electron charge
n = charge carrier density
Hall-Effect Sensor ICs:
Inherent Galvanic Isolation
High Power Applications:
Sensing > 200 A Currents with Allegro Sensor ICs
1 mm “thin”package for enhanced accuracy; placed in the gap of a ferromagnetic concentrator
Allegro’s high bandwidth current sensor SIP: the A136x family
Sensing 50 to 200 A
Allegro’s ACS75x Family of Devices
- Small physical size (7 mm nominal height)
- 100 µΩ integrated conductor, galvanic isolation for line-powered systems
- Enhanced accuracy, typically < 4% total error from –۴۰°C to 150°C
- Low noise, > 100 kHz bandwidth sensor
- Integrated shield reduces output spiking in high dV/dt applications
Allegro’s recently released the ACS756 and ACS758 devices include significant advances over previous generations
Sensing < 50 A
Allegro’s ACS712 Family of Flip-Chip Devices
- SOIC8 with integrated 1.2 mΩ conductor
- Isolation for line powered applications
- <4% typical error over –۴۰°C to 150°C range
- Low noise, 80 kHz bandwidth current sensor
- Integrated shield reduces output spiking in high dV/dt applications
Flip chip assembly techniques locate the Hall transducer very close to the integrated conductor
High Bandwidth AC Sensing
Allegro Shield Solution
- A parasitic capacitor is formed by the current-carrying leadframe and the Hall-effect IC surface
- Adding an electrostatic shield between the silicon and the current-carrying leadframe allows the noise to bypass the silicon
- Shield layer is connected to device ground inside the package
Allegro Product Line and Applications Overview
A1360 Series
ACS712 Family5 to 50 A
ACS756 & ACS75850 to 200 A
DC/DC Converters, Inverters, Battery Current Measurement, Smart Metering, Hybrid Vehicles
Industrial Motors, Lighting, Power Supplies, White Goods, Hybrid Vehicles
UPS Systems, HVAC Control, Inverters, Power Supplies, Hybrid Vehicles, Power Steering and Braking Systems
A growing portfolio with many new, unannounced products under development!
