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ACS712_datasheet

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标签: ACS712霍尔传感器

ACS712电流传感器的数据手册,包括外围电路的搭建和计算,和芯片内部的电路。

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ACS712 Fully Integrated Hall EffectBased Linear Current Sensor with 21 kVRMS Voltage Isolation and a LowResistance Current Conductor Features and Benefits Lownoise analog signal path Device bandwidth is set via the new FILTER pin 5 s output rise time in response to step input current 80 kHz bandwidth Total output error 15 at TA 25C Small footprint lowprofile SOIC8 package 12 m internal conductor resistance 21 kVRMS minimum isolation voltage from pins 14 to pins 58 50 V single supply o......

ACS712 Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Features and Benefits ▪ Low-noise analog signal path ▪ Device bandwidth is set via the new FILTER pin ▪ 5 μs output rise time in response to step input current ▪ 80 kHz bandwidth ▪ Total output error 1.5% at TA = 25°C ▪ Small footprint, low-profile SOIC8 package ▪ 1.2 mΩ internal conductor resistance ▪ 2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8 ▪ 5.0 V, single supply operation ▪ 66 to 185 mV/A output sensitivity ▪ Output voltage proportional to AC or DC currents ▪ Factory-trimmed for accuracy ▪ Extremely stable output offset voltage ▪ Nearly zero magnetic hysteresis ▪ Ratiometric output from supply voltage TÜV America Certificate Number: U8V 06 05 54214 010 Package: 8 Lead SOIC (suffix LC) Approximate Scale 1:1 Description The Allegro® ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, 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. The device consists of a precise, 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 after packaging. The output of the device has a positive slope (>VIOUT(Q)) 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 1.2 mΩ typical, providing low power Continued on the next page… Typical Application IP 1 2 3 4 IP+ IP+ VCC VIOUT ACS712 IP– IP– FILTER GND 8 7 6 5 +5 V VOUT CF 1 nF CBYP 0.1 μF Application 1. The ACS712 outputs an analog signal, VOUT . that varies linearly with the uni- or bi-directional AC or DC primary sensed current, IP , within the range specified. CF is recommended for noise management, with values that depend on the application. ACS712-DS, Rev. 6 ACS712 Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Description (continued) 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 5 through 8). This allows the ACS712 current sensor to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. The ACS712 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 device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory. Selection Guide Part Number Packing* Tape and reel, 3000 pieces/reel Tape and reel, 3000 pieces/reel Tape and reel, 3000 pieces/reel ACS712ELCTR-05B-T ACS712ELCTR-20A-T ACS712ELCTR-30A-T *Contact Allegro for additional packing options. Absolute Maximum Ratings Characteristic Supply Voltage Reverse Supply Voltage Output Voltage Reverse Output Voltage Reinforced Isolation Voltage Basic Isolation Voltage Output Current Source Output Current Sink Overcurrent Transient Tolerance Nominal Operating Ambient Temperature Maximum Junction Temperature Storage Temperature Symbol VCC VRCC VIOUT VRIOUT VISO VISO(bsc) IIOUT(Source) IIOUT(Sink) IP TA TJ(max) Tstg TA (°C) –40 to 85 –40 to 85 –40 to 85 Optimized Range, IP (A) ±5 ±20 ±30 Sensitivity, Sens (Typ) (mV/A) 185 100 66 Notes Rating Units Pins 1-4 and 5-8; 60 Hz, 1 minute, TA=25°C Voltage applied to leadframe (Ip+ pins), based on IEC 60950 Pins 1-4 and 5-8; 60 Hz, 1 minute, TA=25°C Voltage applied to leadframe (Ip+ pins), based on IEC 60950 1 pulse, 100 ms Range E 8 –0.1 8 –0.1 2100 184 1500 354 3 10 100 –40 to 85 165 –65 to 170 V V V V V Vpeak V Vpeak mA mA A ºC ºC ºC Parameter Specification Fire and Electric Shock CAN/CSA-C22.2 No. 60950-1-03 UL 60950-1:2003 EN 60950-1:2001 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 ACS712 Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Functional Block Diagram +5 V VCC (Pin 8) Hall Current Drive Sense Temperature Coefficient Trim t n o i t e s f f i O c m a n y D a l l e c n a C Signal Recovery RF(INT) VIOUT (Pin 7) Sense Trim 0 Ampere Offset Adjust GND (Pin 5) FILTER (Pin 6) IP+ (Pin 1) IP+ (Pin 2) IP− (Pin 3) IP− (Pin 4) Pin-out Diagram IP+ IP+ IP– IP– 1 2 3 4 8 7 6 5 VCC VIOUT FILTER GND Terminal List Table Number 1 and 2 3 and 4 5 6 7 8 Name IP+ IP– GND FILTER VIOUT VCC Description Terminals for current being sensed; fused internally Terminals for current being sensed; fused internally Signal ground terminal Terminal for external capacitor that sets bandwidth Analog output signal Device power supply terminal Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 ACS712 Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor COMMON OPERATING CHARACTERISTICS1 over full range of TA , CF = 1 nF, and VCC = 5 V, unless otherwise specified Test Conditions Min. Typ. Max. Units Characteristic Symbol VCC ICC CLOAD RLOAD ELECTRICAL CHARACTERISTICS Supply Voltage Supply Current Output Capacitance Load Output Resistive Load Primary Conductor Resistance RPRIMARY TA = 25°C Rise Time Frequency Bandwidth Nonlinearity Symmetry tr f ELIN ESYM VIOUT(Q) Zero Current Output Voltage Power-On Time tPO 4.5 – – 4.7 – – – – 98 – – 5.0 10 – – 1.2 5 80 1.5 100 VCC × 0.5 35 5.5 13 10 – – – – – 102 – – V mA nF kΩ mΩ μs kHz % % V μs VCC = 5.0 V, output open VIOUT to GND VIOUT to GND IP = IP(max), TA = 25°C, COUT = open –3 dB, TA = 25°C; IP is 10 A peak-to-peak Over full range of IP Over full range of IP Bidirectional; IP = 0 A, TA = 25°C Output reaches 90% of steady-state level, TJ = 25°C, 20 A present on leadframe Magnetic Coupling2 G/A Internal Filter Resistance3 kΩ 1Device may be operated at higher primary current levels, IP, and ambient, TA , and internal leadframe temperatures, TA , provided that the Maximum Junction Temperature, TJ(max), is not exceeded. 21G = 0.1 mT. 3RF(INT) forms an RC circuit via the FILTER pin. RF(INT) 12 1.7 – – COMMON THERMAL CHARACTERISTICS1 Operating Internal Leadframe Temperature TA E range Min. –40 Typ. – Junction-to-Lead Thermal Resistance2 Junction-to-Ambient Thermal Resistance RθJL Mounted on the Allegro ASEK 712 evaluation board RθJA Mounted on the Allegro 85-0322 evaluation board, includes the power con- sumed by the board Max. 85 Value 5 23 Units °C Units °C/W °C/W 1Additional thermal information is available on the Allegro website. 2The Allegro 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 connect- ing the layers. Performance values include the power consumed by the PCB. Further details on the board are available from the Frequently Asked Questions document on our website. Further information about board design and thermal performance also can be found in the Applications Informa- tion section of this datasheet. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 ACS712 Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor x05B PERFORMANCE CHARACTERISTICS TA = –40°C to 85°C1, CF = 1 nF, and VCC = 5 V, unless otherwise specified Typ. Test Conditions Characteristic Symbol Optimized Accuracy Range Sensitivity Noise Zero Current Output Slope Sensitivity Slope IP Sens VNOISE(PP) ∆IOUT(Q) ∆Sens Over full range of IP, TA = 25°C Peak-to-peak, TA = 25°C, 185 mV/A programmed Sensitivity, CF = 47 nF, COUT = open, 2 kHz bandwidth TA = –40°C to 25°C TA = 25°C to 150°C TA = –40°C to 25°C TA = 25°C to 150°C IP =±5 A, TA = 25°C Total Output Error2 1Device may be operated at higher primary current levels, IP, and ambient temperatures, TA, provided that the Maximum Junction Temperature, TJ(max), is not exceeded. 2Percentage of IP, with IP = 5 A. Output filtered. ETOT % x20A PERFORMANCE CHARACTERISTICS TA = –40°C to 85°C1, CF = 1 nF, and VCC = 5 V, unless otherwise specified Typ. Test Conditions Characteristic Symbol Optimized Accuracy Range Sensitivity Noise Zero Current Output Slope Sensitivity Slope IP Sens VNOISE(PP) ∆IOUT(Q) ∆Sens Over full range of IP, TA = 25°C Peak-to-peak, TA = 25°C, 100 mV/A programmed Sensitivity, CF = 47 nF, COUT = open, 2 kHz bandwidth TA = –40°C to 25°C TA = 25°C to 150°C TA = –40°C to 25°C TA = 25°C to 150°C IP =±20 A, TA = 25°C Total Output Error2 1Device may be operated at higher primary current levels, IP, and ambient temperatures, TA, provided that the Maximum Junction Temperature, TJ(max), is not exceeded. 2Percentage of IP, with IP = 20 A. Output filtered. ETOT % x30A PERFORMANCE CHARACTERISTICS TA = –40°C to 85°C1, CF = 1 nF, and VCC = 5 V, unless otherwise specified Typ. Test Conditions Characteristic Symbol Optimized Accuracy Range Sensitivity Noise Zero Current Output Slope Sensitivity Slope IP Sens VNOISE(PP) ∆IOUT(Q) ∆Sens Over full range of IP , TA = 25°C Peak-to-peak, TA = 25°C, 66 mV/A programmed Sensitivity, CF = 47 nF, COUT = open, 2 kHz bandwidth TA = –40°C to 25°C TA = 25°C to 150°C TA = –40°C to 25°C TA = 25°C to 150°C IP = ±30 A , TA = 25°C Total Output Error2 1Device may be operated at higher primary current levels, IP, and ambient temperatures, TA, provided that the Maximum Junction Temperature, TJ(max), is not exceeded. 2Percentage of IP, with IP = 30 A. Output filtered. ETOT Min. –5 180 Min. –20 96 – – – – – – – – – – – – – – – – – – Min. –30 64 – 185 21 –0.26 –0.08 0.054 –0.008 ±1.5 – 100 11 –0.34 –0.07 0.017 –0.004 ±1.5 – 66 7 –0.35 –0.08 0.007 –0.002 ±1.5 Max. 5 190 – Max. 20 104 – – – – – – – – – – – – – – – – Max. 30 68 – Units A mV/A mV mV/°C mV/°C mV/A/°C mV/A/°C Units A mV/A mV mV/°C mV/°C mV/A/°C mV/A/°C Units A mV/A mV mV/°C mV/°C mV/A/°C mV/A/°C % Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5
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