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ACS770XCB Datasheet(PDF) 1 Page - Allegro MicroSystems |
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ACS770XCB Datasheet(HTML) 1 Page - Allegro MicroSystems |
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1 / 29 page  Application 1: the ACS770 outputs an analog signal, VOUT, that varies linearly with the bidirectional AC or DC primary sampled cur- rent, IP, within the range specified. RF and CF are for optimal noise management, with values that depend on the application. ACS770xCB The Allegro™ ACS770 family of current sensor ICs provides economicalandprecisesolutionsforACorDCcurrentsensing. Typical applications include motor control, load detection and management, power supply and DC-to-DC converter control, inverter control, and overcurrent fault detection. 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 that is concentrated by a low magnetic hysteresis core, then converted by the Hall IC into a proportionalvoltage.Deviceaccuracyisoptimizedthroughthe close proximity of the magnetic signal to the Hall transducer. A precise, proportional output voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the factory. Proprietary digital temperature compensation technology greatly improves the IC accuracy and temperature stability without influencing the high-bandwidth operation of the analog output. High-level immunity to current conductor dV/dt and stray electricfieldsisofferedbyAllegroproprietaryintegratedshield technology for low output voltage ripple and low offset drift in high-side, high-voltage applications. The output of the device has a positive slope (>VCC/2 for bidirectional devices) when an increasing current flows through the primary copper conduction path (from terminal 4 to terminal 5), which is the path used for current sampling. The internal resistance of this conductive path is 100 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 ACS770-DS, Rev. 5 Thermally Enhanced, Fully Integrated, Hall-Effect-Based High-Precision Linear Current Sensor IC with 100 µΩ Current Conductor Continued on the next page… Typical Application 5 V VOUT RF CF CBYP 0.1 µF IP+ IP– 2 GND 4 5 ACS770 3 1 VIOUT VCC I P • Industry-leading total output accuracy achieved with new piecewise linear digital temperature compensation of offset and sensitivity • Industry-leading noise performance through proprietary amplifier and filter design techniques • 120 kHz typical bandwidth • 4.1 µs output rise time in response to step input current • 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 • Greatly improved total output error through digitally programmed and compensated gain and offset over the full operating temperature range • Small package size, with easy mounting capability • Monolithic Hall IC for high reliability • Ultralow power loss:100 µΩ internal conductor resistance • Galvanic isolation allows use in economical, high-side current sensing in high-voltage systems • 4.5 to 5.5 V, single supply operation • Output voltage proportional to AC or DC currents • Factory-trimmed for accuracy • Extremely stable output offset voltage PFF Leadform PSF Leadform Additional leadforms available for qualifying volumes Ty pe te ste d PACKAGE: 5-pin package (suffix CB) Continued on the next page… DESCRIPTION FEATURES AND BENEFITS TÜV America Certificate Number: U8V 14 05 54214 028 November 2, 2016 |
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