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ACS758XCB Datasheet(PDF) 1 Page - Allegro MicroSystems |
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ACS758XCB Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 16 page Application 1. The ACS758 outputs an analog signal, VOUT, that varies linearly with the uni- or bi-directional AC or DC primary sampled current, IP, within the range specified. CF is for optimal noise management, with values that depend on the application. ACS758xCB Description The Allegro® ACS758 family of current sensor ICs provides economical and precise solutions forAC or DC current sensing. 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 which the Hall IC converts into a proportional voltage. Device accuracy is optimized through the 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. High level immunity to current conductor dV/dt and stray electric fields, offered by Allegro proprietary integrated shield technology, guarantees 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)whenan 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 ACS758-DS, Rev. 1 Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Continued on the next page… Typical Application +3.3 or 5 V VOUT RF CF CBYP 0.1 μF IP+ IP– 2 GND 4 5 ACS758 3 1 VIOUT VCC I P Features and Benefits ▪ 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 ▪ Total output error improvement through gain and offset trim over temperature ▪ Small package size, with easy mounting capability ▪ Monolithic Hall IC for high reliability ▪ Ultra-low power loss: 100 μΩ internal conductor resistance ▪ Galvanic isolation allows use in economical, high-side current sensing in high voltage systems ▪ 3.0 to 5.5 V, single supply operation ▪ 120 kHz typical bandwidth ▪ 3 μs output rise time in response to step input current ▪ Output voltage proportional to AC or DC currents ▪ Factory-trimmed for accuracy ▪ Extremely stable output offset voltage ▪ Nearly zero magnetic hysteresis PSS Leadform PFF Leadform Package: 5-pin package Additional leadforms available for qualifying volumes |
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