Details, datasheet, quote on part number: ACS704
PartACS704
CategorySensors
DescriptionCurrent Sensor Modules
The Allegro ACS704 family of current sensors provides economical and precise solutions for current sensing in industrial, automotive, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection.
CompanyAllegro Micro Systems, Inc.
DatasheetDownload ACS704 datasheet
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Features, Applications

Fully Integrated, Hall Effect-Based Linear Current Sensor with Voltage Isolation and a Low-Resistance Current Conductor

The Allegro ACS704 family of current sensors provides economical and precise solutions for current sensing in industrial, automotive, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection.

Pins 6 and 7 are internally connected in shipping product. For compatibility with future devices, leave pin 6 floating.

The device consists of a precision, low-offset linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the factory. The output of the device has a positive slope (>VCC / 2) when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. The internal resistance of this conductive path is typically 1.5 m, providing low power loss. The thickness of the copper conductor allows survival of the device to 5× overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS704 family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. The ACS704 is provided in a small, surface mount SOIC8 package. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the flip-chip uses hightemperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.

Nominal Operating Temperature, TA Range E............................................ to 85ºC Overcurrent Transient Tolerance*, IP................ 60 A

total pulses, 250 ms duration each, applied at a rate of 1 pulse every 100 seconds.

Supply Voltage, VCC.......................................... 16 V Reverse Supply Voltage, VRCC........................ ­16 V Output Voltage, VOUT........................................ 16 V Reverse Output Voltage, VROUT...................... ­0.1 V Output Current Source, IOUT(Source)................. 3 mA Output Current Sink, IOUT(Sink)....................... 10 mA Operating Temperature, Maximum Junction, TJ(max)....................... 165°C Storage Temperature, TS...................... to 170°C

Small footprint, low-profile SOIC8 package 1.5 m internal conductor resistance Excellent replacement for sense resistors 800 VRMS minimum isolation voltage between pins 1-4 and 5.5 V, single supply operation 50 kHz bandwidth 133 mV/A output sensitivity and 15 A dynamic range Output voltage proportional to ac and dc currents Factory-trimmed for accuracy Extremely stable output offset voltage Near-zero magnetic hysteresis Ratiometric output from supply voltage

Use the following complete part number when ordering:
For compatibility with future devices, leave pin 6 floating.
ELECTRICAL CHARACTERISTICS, over operating ambient temperature range unless otherwise stated

Characteristic Symbol Test Conditions Min. 1 Primary Sensed Current IP ­5 Supply Voltage VCC 4.5 Supply Current ICC VCC 5.0 V, output open 5 IOUT mA ­ Output Resistance ROUT Output Capacitance Load CLOAD VOUT to GND ­ VOUT to GND 4.7 Output Resistive Load RLOAD Primary Conductor Resistance RPRIMARY 25°C ­ Isolation Voltage VISO Pins 1-4 and 5-8; 60 Hz, 1 minute 800 PERFORMANCE CHARACTERISTICS, to 85°C, VCC 5 V unless otherwise specified Propagation Time tPROP 25°C ­ Response Time tRESPONSE = 25°C Rise Time Frequency Bandwidth 25°C ­3 dB, 10 A peak-topeak; no external filter Over full range , IP applied for 5 ms; = 25°C Over full range , IP applied for 5 ms; to 85°C Peak-to-peak, 25°C, no external filter Root Mean Square, 25°C, no external filter Over full range , IP applied for 5 ms; to 85°C Over full range , IP applied for 5 ms; 0 A, after excursion , IP applied for 5 ms; , IP applied for 5 ms; to 85°C Typ. VCC Max. Units mA nF kHz mV/A A %

Linearity Symmetry Zero Current Output Voltage Electrical Offset Voltage Magnetic Offset Error

1Device may be operated at higher primary current, I , and Ambient Temperature, T , levels, provided that the Maximum Junction Temperature, P A J(max), is not exceeded. I , with 5 A; Output filtered. a 2.0% shift E P TOT may be observed at end-of-life for this device.


 

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