Fully Integrated / Hall Effect-Based Linear Current Sensor

ACS704ELC-005 Fully Integrated, Hall Effect-Based Linear Current Sensor with Voltage Isolation and a Low-Resistance Current Conductor Not for New Design These parts are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Date of status change: October 31, 2006 Recommended Substitutions: www.DataSheet4U.com For existing customer transition, and for new customers or new applications, refer to the ACS712. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. ACS706ELC-20A Bidirectional 1.5 mΩ Hall Effect Based Linear Current Sensor with Voltage Isolation and 20 A Dynamic Range The Allegro ACS706 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. Pin 8: VCC Pin 7: VOUT Pin 1: IP+ Pin 2: IP+ Pin 3: IP– Pin 4: IP– Pin 6: N.C. Pin 5: GND Package LC 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 mΩ, providing low power loss. The thickness of the copper conductor allows survival of the device at up to 3× overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS706 family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. The ACS706 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 high-temperature 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............................................ –40 to 85ºC Overcurrent Transient Tolerance*, IP ................ 60 A *100 total pulses, 250 ms duration each, applied at a rate of 1 pulse every 100 seconds. ABSOLUTE MAXIMUM RATINGS 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 Maximum Transient Sensed Current*, IR(max) ... 100 A Operating Temperature, Maximum Junction, TJ(max)....................... 165°C Storage Temperature, TS ...................... –65 to 170°C *Junction Features and Benefits • Small footprint, low-profile SOIC8 package • • • • • • • • • • • 1.5 mΩ internal conductor resistance Excellent replacement for sense resistors 1600 VRMS minimum isolation voltage between pins 1-4 and 5-8 4.5 to 5.5 V, single supply operation 50 kHz bandwidth 100 mV/A output sensitivity and 20 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 Temperature, TJ < TJ(max). TÜV America Certificate Number: U8V 04 12 54214 005 Use the following complete part number when ordering: Part Number ACS706ELC-20A Package SOIC8 surface mount ACS706ELC20A-DS, Rev. 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ACS706ELC-20A Functional Block Diagram +5 V Pin 3 Pin 4 IP– IP– VCC Pin 8 Voltage Regulator To all subcircuits Dynamic Offset Cancellation Amp Filter VOUT Pin 7 Out N.C. Pin 6 A 0.1 μF Gain Temperature Coefficient Offset Trim Control IP+ IP+ Pin 1 Pin 2 GND Pin 5 A Pins 6 and 7 are internally connected in shipping product. For compatibility with future devices, leave pin 6 floating. 2 ACS706ELC20A-DS, Rev. 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ACS706ELC-20A OPERATING CHARACTERISTICS Characteristic Optimized Accuracy Range Linear Sensing Range Supply Voltage Supply Current Output Resistance Output Capacitance Load Output Resistive Load Primary Conductor Resistance RMS Isolation Voltage DC Isolation Voltage Propagation Time Response Time Rise Time Frequency Bandwidth Sensitivity Noise Linearity Symmetry Zero Current Output Voltage Electrical Offset Voltage Magnetic Offset Error Total Output Error1 Symbol IP IR VCC ICC ROUT CLOAD RLOAD RPRIMARY VISORMS VISODC tPROP tRESPONSE tr f Sens VNOISE ELIN ESYM VOUT(Q) VOE IERROM ETOT IP = ±20 A, TA = 25°C IP = ±20 A, TA = 25°C IP = ±20 A, TA = 25°C –3 dB, TA = 25°C; IP is 10 A peak-to-peak; no external filter Over full range of IP , IP applied for 5 ms; TA = 25°C Over full range of IP , IP applied for 5 ms Peak-to-peak, TA = 25°C, no external filter Root Mean Square, TA = 25°C, no external filter Over full range of IP , IP applied for 5 ms Over full range of IP , IP applied for 5 ms IP = 0 A, TA = 25°C IP = 0 A, TA = 25°C IP = 0 A IP = 0 A, after excursion of 20 A IP = ±20 A , IP applied for 5 ms; TA = 25°C IP = ±20 A , IP applied for 5 ms VCC = 5.0 V, output open IOUT = 1.2 mA VOUT to GND VOUT to GND TA = 25°C Pins 1-4 and 5-8; 60 Hz, 1 minute Test Conditions Min. –20 –20 4.5 5 – – 4.7 – 1600 – – – – – – 94 – – – 98 – –15 –50 – – – Typ. – – 5.0 8 1 – – 1.5 2500 5000 3.15 6 6.56 50 100 – 70 12.5 ±1 100 VCC / 2 – – ±0.01 ±1.5 – Max. 20 20 5.5 10 2 10 – – – – – – – – – 106 – – ±3.5 102 – 15 50 ±0.05 – ±8.4 Units A A V mA Ω nF kΩ mΩ V V μs μs μs kHz mV/A mV/A mV mV % % V mV mV A % % ELECTRICAL CHARACTERISTICS, over operating ambient temperature range unless otherwise specified PERFORMANCE CHARACTERISTICS, over operating ambient temperature range unless otherwise specified THERMAL CHARACTERISTICS2,3, TA = –40°C to 125°C, VCC = 5 V unless otherwise specified – Junction-to-Lead Thermal Resistance Junction-to-Ambient Thermal Resistance 1Percentage 2 The Allegro Value 5 – – Units °C/W RθJL Mounted on the Allegro ASEK 70x evaluation board; additional information about reference boards and tests is available on the Allegro Web site Mounted on the Allegro ASEK 70x evaluation board; additional information about reference boards and tests is available on the Allegro Web site – RθJA – 41 – °C/W of IP, with IP = 20 A. Output filtered. Up to a 2.0% shift in ETOT may be observed at end-of-life for this device. evaluation board has 1500 mm2 of 2 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connecting the layers. Performance values include the power consumed by the PWB. Further details on the board are available from the ACS704 Frequently Asked Questions document on our website. Further information about board design and thermal performance also can be found on pages 16 and 17 of this datasheet. 3R θJA values shown in this table are typical values, measured on the Allegro evaluation board. The actual thermal performance depends on the board design, the airflow in the system, and thermal interactions between the sensor and surrounding components through the PCB and the ambient air. To improve thermal performance, see our applications material on the Allegro Web site. 3 ACS706ELC20A-DS, Rev. 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ACS706ELC-20A Typical Performance Characteristics Supply Current versus Ambient Temperature VCC = 5 V 10.0 9.5 9.0 ICC (mA) 8.5 8.0 7.5 7.0 6.5 6.0 -50 -25 0 25 50 75 100 125 150 TA (°C) Supply Current versus Applied VCC 8.66 8.64 8.62 8.60 8.58 8.56 8.54 8.52 8.50 8.48 8.46 8.44 4.5 4.6 4.7 4.8 4.9 5 VCC (V) 5.1 5.2 5.3 5.4 5.5 ICC (mA) 4 ACS706ELC20A-DS, Rev. 2 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ACS706ELC-20A Output Voltage versus Primary Curren