Allegro Hall Effect-Based Current Sensor ICs

Hall Effect Basics



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 ?Ω integrated conductor, galvanic isolation for line-powered systems.

Enhanced accuracy, typically < 4% total error from -40°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 -40°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

Applications:

• DC/DC Converters.
• Inverters.
• Battery Current Measurement.
• Smart Metering.
• Hybrid Vehicles.

ACS712 Family 5 to 50 A

Applications:

• Industrial Motors.
• Lighting.
• Power Supplies.
• White Goods.
• Hybrid Vehicles.

ACS756 & ACS758 50 to 200 A

Applications:

• UPS Systems.
• HVAC Control.
• Inverters.
• Power Supplies.
• Hybrid Vehicles.
• Power Steering and Braking Systems.

A growing portfolio with many new, unannounced products under development.!

Fuente: http://www.allegromicro.com/en/products/design/current_sensors/index.asp

Nombre: Rodriguez B. Joiver I.
Asignatura: CRF