Data Sheet ACHS-7121/7122/7123 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kV Isolation and RMS Low-Resistance Current Conductor Overview Features The Broadcom ACHS-7121/7122/7123 product series is a Wide operating temperature: 40C to 110C fully integrated Hall Effect-based isolated linear current sensor Primary conductor resistance: 0.7 m typ. device family designed for AC or DC current sensing in Sensing current range: 10A, 20A, and 30A industrial, commercial, and communications systems. Each of Output sensitivity: 66 to 185 mV/A the ACHS-7121/7122/7123 consists of a precise, low-offset, Output voltage proportional to AC or DC currents linear Hall circuit with a copper conduction path located near Ratiometric output from supply voltage the surface of the die. Applied current flowing through this Single supply operation: 5.0V copper conduction path generates a magnetic field that the Hall Low-noise analog signal path IC converts into a proportional voltage. Device accuracy is Device bandwidth is set via FILTER pin: optimized through the close proximity of the magnetic signal to 80 kHz typ. Bandwidth with 1-nF filter capacitor the Hall transducer. Factory-trimmed for accuracy A precise, proportional voltage is provided by the low-offset, Extremely stable output offset voltage chopper-stabilized CMOS Hall IC, which is programmed for Near zero magnetic hysteresis accuracy after packaging. The output of the device has a Typical total output error of 1.5% positive slope (>V ) when an increasing current flows OUT(Q) >25 kV/ s Common-Mode Transient Immunity through the primary copper conduction path (from pins 1 and 2, Small footprint, low-profile SO-8 package to pins 3 and 4), which is the path used for current sampling. Worldwide Safety Approval: UL, CSA: The internal resistance of this conductive path is 0.7 m Isolation Voltage 3 kV , 1 minute RMS typical, providing low-power loss. The terminals of the conductive path are electrically isolated from the signal leads Applications (pins 5 through 8). This performance is delivered in a compact, surface mountable, SO-8 package that meets worldwide Low-power inverter current sensing regulatory safety standards. Motor phase and rail current sensing Solar inverters Part Number Current Range Sensitivity Chargers and converters Switching power supplies ACHS-7121 10A 185 mV/A ACHS-7122 20A 100 mV/A ACHS-7123 30A 66 mV/A CAUTION It is advised that normal static precautions be taken in handling and assembly of this component to prevent damage and/or degradation which may be induced by ESD. The components featured in this data sheet are not to be used in military or aerospace applications or environments. The component is not AEC-Q100 qualified and not recommended for automotive applications. Broadcom ACHS-712x-DS102 July 8, 2020Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 3 kV Isolation and RMS ACHS-7121/7122/7123 Data Sheet Low-Resistance Current Conductor Functional Diagram 1 8 I V P+ DD 2 7 I V P+ OUT 3 6 I FILTER P 4 5 I GND P NOTE: The connection of 1-F bypass capacitor between pins 8 and 5 is recommended. Pin Description Pin Pin Name Description Pin Pin Name Description 1I Terminals for current being sampled fused 8V Supply voltage relative to GND P+ DD internally 2I 7V Output Voltage P+ OUT 3I Terminals for current being sampled fused 6 FILTER Filter pin to set bandwidth P internally 4I 5 GND Output side ground P Typical Application Circuit A typical application circuit for the ACHS-7121/7122/7123 product series consists of a bypass capacitor and a filter capacitor as additional external components. On the input side, pins 1 and 2 are shorted together and pins 3 and 4 shorted together. The output voltage is directly measured from the V pin. OUT 5V I V P+ DD I CBYPASS P+ OUTPUT I V OUT P+ I FILTER P C F I P I GND P Broadcom ACHS-712x-DS102 2