Current Sensor

Current Sensor: ACS750xCA-075 The Allegro ACS75x 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, power supplies, and overcurrent fault protection. The device consists of a precision, low-offset linear Hall sensor circuit with a copper conduction path located near 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, chopperstabilized 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 terminal 4 to terminal 5), which is the path used for current sensing. The internal resistance of this conductive path is typically 130 µΩ, providing low power loss. The thickness of the copper conductor allows survival of the device at up to 5× overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 1 through 3). This allows the ACS75x family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. The device is fully calibrated prior to shipment from the factory. The ACS75x family is lead-free. All leads are coated with 100% matte tin, and there is no lead inside the package. The heavy gauge leadframe is made of oxygen-free copper. www.DataSheet4U.com 4 5 1 2 3 Pin 1: VCC Pin 2: Gnd Pin 3: Output Terminal 4: Ip+ Terminal 5: Ip- ABSOLUTE MAXIMUM RATINGS Operating Temperature S ..................................................... –20 to +85ºC L ................................................... –40 to +150ºC Supply Voltage, Vcc........................................... 16 V Reverse Supply Voltage, VRCC ........................ –16 V Output Voltage ................................................... 16 V Reverse Output Voltage, VROUT...................... –0.1 V Output Current Source ..................................... 3 mA Output Current Sink........................................10 mA Maximum Storage Temperature...........–65 to 170°C Maximum Junction Temperature .................... 165°C Features and Benefits • • • • • • • • • • • Monolithic Hall IC for high reliability Single +5 V supply 3 kVRMS isolation voltage between terminals 4/5 and pins 1/2/3 Lead-free Automotive temperature range available End-of-line factory-trimmed for gain and offset Ultra-low power loss: 130 µΩ internal conductor resistance Ratiometric output from supply voltage Extremely stable output offset voltage Small package size, with easy mounting capability Output proportional to ac and dc currents Always order by complete part number: ACS750SCA-075 ACS750LCA-075 Applications TÜV America Certificate Number: U8V 04 11 54214 002 • • • • • Industrial systems Motor control Power conversion Battery monitors Automotive systems ACS75075-DS Rev. 7 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Current Sensor: ACS750xCA-075 Functional Block Diagram +5 V IP– Terminal 5 VCC Pin 1 Voltage Regulator To all subcircuits Dynamic Offset Cancellation Amp Filter Out VOUT Pin 3 0.1 µF Gain Temperature Coefficient Trim Control Offset IP+ Terminal 4 GND Pin 2 2 ACS75075-DS Rev. 7 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Current Sensor: ACS750xCA-075 ELECTRICAL CHARACTERISTICS, over temperature unless otherwise stated Characteristic Symbol Test Conditions Min. Primary Sensed Current IP –75 4.5 Supply Voltage VCC Supply Current ICC VCC = 5.0 V, output open – IOUT = 1.2 mA – Output Resistance ROUT Output Capacitance Load CLOAD VOUT to GND – Output Resistive Load RLOAD VOUT to GND 4.7 IP = ±100A, TA = +25°C – Primary Conductor Resistance RPRIMARY Pins 1-3 and 4-5, 60 Hz, 1 minute 3.0 Isolation Voltage VISO PERFORMANCE CHARACTERISTICS, –20°C to +85°C, VCC = 5 V unless otherwise specified Propagation time tPROP IP = ±50 A, TA = +25°C – – Response time tRESPONSE IP = ±50 A, TA = +25°C Rise time Frequency Bandwidth tr f IP = ±50 A, TA = +25°C – –3 dB, TA = +25°C – Over full range of IP , TA = +25°C 18.75 Sensitivity Sens Over full range of IP 17.5 Peak-to-peak, TA = +25°C – Noise VNOISE External filter BW = 24 kHz Nonlinearity ELIN Over full range of IP – Symmetry ESYM Over full range of IP 97 Zero Current Output Voltage VOUT(Q) I = 0 A, TA = +25°C – I = 0 A, TA = +25°C –40 Electrical Offset Voltage VOE (Magnetic error not included) I=0A –50 Magnetic Offset Error IERROM I = 0 A, after excursion of 100 A – Over full range of IP , TA = +25°C – Total Output Error ETOT (Including all offsets) Over full range of IP – PERFORMANCE CHARACTERISTICS, –40°C to +85°C, VCC = 5 V unless otherwise specified Propagation time tPROP IP = ±50 A, TA = +25°C – Response time tRESPONSE IP = ±50 A, TA = +25°C – IP = ±50 A, TA = +25°C – Rise time tr – Frequency Bandwidth f –3 dB , TA = +25°C Over full range of IP , TA = +25°C 18.75 Sensitivity Sens Over full range of IP 16.5 Peak-to-peak; TA = +25°C Noise VNOISE – External filter BW = 40 kHz Over full range of IP – Nonlinearity ELIN Symmetry ESYM Over full range of IP 97 Zero Current Output Voltage VOUT(Q) I = 0 A, TA = +25°C – I = 0 A, TA = +25°C –40 Electrical Offset Voltage VOE (Magnetic error not included) I=0A –60 Magnetic Offset Error IERROM I = 0 A, after excursion of 100 A – Over full range of IP , TA = +25°C – Total Output Error ETOT (Including all offsets) Over full range of IP – Typ. – 5.0 7 1 – – 130 – 4 27 26 13 19.75 – 7 – 100 VCC / 2 – – ±0.3 ±1 – 4 27 26 13 19.75 – 7 – 100 VCC / 2 – – 0.3 ±1 – Max. 75 5.5 10 2 10 – – – – – – – 20.75 21.5 – ±5 103 – 40 50 ±0.8 – ±13 – – – – 20.75 23 – ±5 103 – 40 60 ±0.8 – ±15 Units A V mA Ω nF kΩ µΩ kV µs µs µs kHz mV/A mV/A mV % % V mV mV A % % µs µs µs kHz mV/A mV/A mV % % V mV mV A % % 3 ACS75075-DS Rev. 7 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Current Sensor: ACS750xCA-075 Typical Performance Characteristics Supply Current Vcc = 5 V 8 7.8 7.6 Sensitivity (mV/A) Sensitivity Vcc = 5 V 25 20 7.4 Icc (mA) 7.2 7 6.8 6.6 6.4 6.2 6 -50 -25 0 25 50 75 100 125 150 Temperature (°C) 15 10 5 -40 C -20 C 25 C 85 C 150 C 0 -100 -75 -50 -25 25 50 75 100 Primary Current (A) Vout vs Primary Current Vcc = 5 V 4.5 4 3.5 Symmetry Vcc = 5 V 100.5 100.4 100.3 Vout (V) 3 -40 C -20 C 25 C 85 C 150 C Symmetry (%) 100.2 100.1 100 99.9 99.8 99.7 99.6 99.5 -50 -25 0 Ip = 75 A 2.5 2 1.5 1 0.5 -100 -75 -50 -25 0 25 Primary Current (A) 50 75 100 25 50 75 Temperature (°C) 100 125 150 Non-Linearity Vcc = 5 V 5 4.5 4 5 4.5 4 Non-Linearity Vcc = 5 V Linearity at -75 A (%) 3 2 1 0 -50 -25 0 25 50 Linearity at 75 A (%) 3.5 2.5 1.5 0.5 Ip = -75 A 3.5 3 2.5 2 1.5 1 0.5 Ip = +75 A 75 100 125 150 0 -50 -25 0 25 50 Temperature (°C) 75 100 125 150 Temperature (°C) 4 ACS75075-DS Rev. 7 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Current Sensor: ACS750xCA-075 Typical Performance Characteristics Magnetic Offset Vcc = 5 V 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -50 -25 0 25 50 75 Temperature (°C) 100 125 150 I = 0 A, after excursion to 100 A Magnetic Offset (A) 0 Ampere Accuracy Error Vcc = 5 V Without Offset 1 0 Ampere Accuracy (A) 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -50 -25 0 25 50 75 Temperature (°C) 100 125 150 5 ACS75075-DS Rev. 7 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Current Sensor: ACS750xCA-075 Definitions of Accuracy Characteristics Sensitivity (Sens): The change in sensor output in response to a 1 A change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity (G / A) and the linear IC amplifier gain (mV/G). The linear IC amplifier gain is trimmed at the factory to optimize the sensitivity (mV/A) for the full-scale current of the device. Noise (VNOISE): The product of the linear IC amplifier gain (mV/G) and the noise floor for the Allegro Hall effect linear IC (≈1 G). The noise floor is derived from the thermal and shot noise observed in Hall elements. Dividing the noise (mV) by the sensitivity (mV/ A) provides the smallest current that the device is able to resolve. Linearity (ELIN): The degree to which the voltage output from the sensor varies in direct proportion to the primary current through its full-scale amplitude. Linearity reveals the maximum deviation from the ideal transfer curve for this transducer. Nonlinearity in the output can be attributed to the gain variation across temperature and saturation of the flux concentrator approaching the full-scale current. The following equation is used to derive the linearity: 100 1– {[ ∆ gain × % sat ( Vout_full-scale amperes – VOUT(Q) ) 2 (Vout_half-scale amperes – VOUT(Q) ) [{ where ∆ gain = the gain variation as a function of temperature changes from 25ºC, % sat = the percentage of saturation of the flux concentrator, which becomes significant as the current being sensed approaches full-scale ±IP , and Vout_full-scale amperes = the output voltage (V) when the sensed current approximates full-scale ±IP . Symmetry (ESYM): The degree to which the absolute v