ACS781LLRTR-050U-T

ACS781xLR High-Precision Linear Hall-Effect-Based Current Sensor IC With 200 µΩ Current Conductor FEATURES AND BENEFITS ▪ Core-less, micro-sized, 100 A continuous current package ▪ Ultra-low power loss: 200 µΩ internal conductor resistance ▪ Immunity to common-mode field interference ▪ Greatly improved total output error through digitally programmed and compensated gain and offset over the full operating temperature range ▪ Industry-leading noise performance through proprietary amplifier and filter design techniques ▪ Integrated shield greatly reduces capacitive coupling from current conductor to die due to high dV/dt signals, and prevents offset drift in high-side, high-voltage applications ▪ Monolithic Hall IC for high reliability ▪ 3 to 3.6 V, single supply operation ▪ 120 kHz typical bandwidth ▪ 3.6 µs output rise time in response to step input current ▪ Output voltage proportional to AC or DC currents ▪ Factory-trimmed for accuracy ▪ Extremely stable quiescent output voltage ▪ AEC-Q100 automotive qualification DESCRIPTION The Allegro ACS781xLR is a fully integrated current sensor linear IC in a new core-less package designed to sense AC and DC currents up to 100 A. This automotive-grade, low-profile (1.5 mm thick) sensor IC package has a very small footprint. The Hall sensor technology also incorporates common-mode field rejection to optimize performance in the presence of interfering magnetic fields generated by nearby current carrying conductors. The device consists of a precision, low-offset linear Hall circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field which the Hall IC converts into a proportional voltage. Device accuracy is optimized through the close proximity of the primary conductor to the Hall transducer and factory programming of the sensitivity and quiescent output voltage at the Allegro factory. Chopper-stabilized signal path and digital temperature compensation technology also contribute to the stability of the device across the operating temperature range. High-level immunity to current conductor dV/dt and stray electric fields, offered by Allegro proprietary integrated shield technology for low-output voltage ripple and low-offset drift in high-side, high-voltage applications. PACKAGE: 7-pin PSOF package (suffix LR) The output of the device has a positive slope (>VCC / 2) when an increasing current flows through the primary copper conduction Continued on the next page… Not to scale ACS781xLR 5 IP+ IP VOUT GND 6 IP– VCC 3 RF VOUT CF 2 1 CBYP 0.1 µF 3.3 V Typical Application Application 1: The ACS781xLR outputs an analog signal, VOUT , that varies linearly with the bidirectional AC or DC primary current, IP , within the range specified. CF is for optimal noise management, with values that depend on the application. ACS781xLR-DS, Rev. 2 MCO-0000276 October 23, 2017 High-Precision Linear Hall-Effect-Based Current Sensor IC With 200 µΩ Current Conductor ACS781xLR DESCRIPTION (CONTINUED) path (from terminal  5 to terminal  6), which is the path used for current sampling. The internal resistance of this conductive path is 200 µΩ typical, providing low power loss. The thickness of the copper conductor allows survival of the device at high overcurrent conditions. The terminals of the conductive path are electrically isolated from the signal leads (pins 1 through 4, and 7), and allows the device to operate safely with voltages up to 100 V peak on the primary conductor. The device is fully calibrated prior to shipment from the factory. The ACS781xLR family is lead (Pb) free. All leads are plated with 100% matte tin, and there is no Pb inside the package. The heavy gauge leadframe is made of oxygen-free copper. SELECTION GUIDE Part Number Sensed Current Direction Primary Sampled Current, IP (A) Sensitivity Sens (Typ.) (mV/A) ACS781LLRTR-050B-T Bidirectional ±50 26.4 ACS781LLRTR-050U-T Unidirectional 0 to 50 39.6 ACS781LLRTR-100B-T Bidirectional ±100 13.2 ACS781LLRTR-100U-T Unidirectional 0 to 100 26.4 ACS781KLRTR-150B-T Bidirectional ±150 transient ±100 continuous 8.8 ACS781KLRTR-150U-T Unidirectional 0 to 150 transient 0 to 100 continuous 17.6 [1] Contact Allegro TOP (°C) Packing [1] –40 to 150 Tape and reel –40 to 125 for additional packing options. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 High-Precision Linear Hall-Effect-Based Current Sensor IC With 200 µΩ Current Conductor ACS781xLR SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Unit Forward Supply Voltage VCC 6 V Reverse Supply Voltage VRCC –0.5 V V Forward Output Voltage VOUT 25 Reverse Output Voltage VRIOUT –0.5 V Output Source Current IOUT(Source) 2.8 mA Output Sink Current Nominal Operating Ambient Temperature Maximum Junction Storage Temperature IOUT(Sink) TOP VOUT to GND Minimum pull-up resistor of 500 Ω 10 mA Range K –40 to 125 °C Range L –40 to 150 °C TJ(max) 165 °C Tstg –65 to 165 °C THERMAL CHARACTERISTICS: May require derating at maximum conditions Characteristic Package Thermal Resistance [1] Additional Symbol Test Conditions [1] Value Unit RθJA Mounted on the Allegro evaluation board ASEK781 85-0807-001 with FR4 substrate and 8 layers of 2 oz. copper (with an area of 1530 mm2 per layer) connected to the primary leadframe and with thermal vias connecting the copper layers. Performance is based on current flowing through the primary leadframe and includes the power consumed by the PCB. 18 °C/W thermal information available on the Allegro website TYPICAL OVERCURRENT CAPABILITIES [2][3] Characteristic Overcurrent Symbol IPOC Rating Unit TA = 25°C, 1 s on time, 60 s off time Notes 285 A TA = 85°C, 1 s on time, 35 s off time 225 A TA = 125°C, 1 s on time, 30 s off time 170 A TA = 150°C, 1 s on time, 10 s off time 95 A [2] Test [3] For was done with Allegro evaluation board (85-0807-001). The maximum allowed current is limited by TJ(max) only. more overcurrent profiles, please see FAQ on the Allegro website, www.allegromicro.com. Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 High-Precision Linear Hall-Effect-Based Current Sensor IC With 200 µΩ Current Conductor ACS781xLR IP+ VCC ACS781xLR Master Current Supply To all subcircuits EEPROM and Control Logic Temperature Sensor Hall Current Drive Dynamic Offset Cancellation Sensitivity Control Programming Control Offset Control VOUT Tuned Filter Amp GND IP– Functional Block Diagram IP+ 5 NC 4 Terminal List Table 3 VOUT 2 GND IP– 6 7 NC 1 VCC Pinout Diagram Number Name 1 VCC Device power supply terminal Description 2 GND Signal ground terminal 3 VOUT Analog output signal 4 NC No connection, connect to GND for optimal ESD performance 5 IP+ Terminal for current being sampled 6 IP– Terminal for current being sampled 7 NC No connection, connect to GND for optimal ESD performance Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 High-Precision Linear Hall-Effect-Based Current Sensor IC With 200 µΩ Current Conductor ACS781xLR COMMON OPERATING CHARACTERISTICS: Valid at TOP = –40°C to 150°C and VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Unit Supply Voltage VCC 3 3.3 3.6 V Supply Current ICC Output open – 11 15 mA Power-On Time tPO TA = 25°C, CBYPASS = Open, CL = 1 nF – 180 – µs Temperature Compensation Time tTC CBYPASS = Open, CL= 1 nF – 50 – µs VPORH TA = 25°C, VCC rising – 2.85 – V VPORL TA = 25°C, VCC falling – 2.6 – V – 250 – mV – 150 – µs Power-On Reset Voltage Power-On Reset Hysteresis VPORHYST Power-On Reset Release Time tPORR TA = 25°C, VCC rising Power-On Reset Disable Time tPORD TA = 25°C, CL = 1 nF Supply Zener Clamp Voltage Vz TA = 25°C, ICC = 30 mA – 14 – µs 6.5 7.5 – V kHz Small signal –3 dB, CL = 1 nF, TA = 25°C – 120 – Chopping Frequency fC TA = 25°C – 500 – kHz Oscillator Frequency fOSC TA = 25°C – 8 – MHz tpd TA = 25°C, CL = 1 nF – 2.2 – µs Internal Bandwidth BWi OUTPUT CHARACTERISTICS Propagation Delay Time Rise Time Response Time Output Saturation Voltage DC Output Resistance Output Load Resistance Output Load Capacitance Primary Conductor Resistance Quiescent Output Voltage Ratiometry Quiescent Output Voltage Error Ratiometry Sensitivity Error Common-Mode Magnetic Field Rejection tr TA = 25°C, CL = 1 nF – 3 – µs tRESPONSE TA = 25°C, CL = 1 nF – 3.6 – µs VSAT(HIGH) TA = 25°C, RLOAD = 10 kΩ to GND 3.1 – – V VSAT(LOW) TA = 25°C, RLOAD = 10 kΩ to VCC – – 200 mV –