ACS710
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ACS710 120 kHz Bandwidth, High Voltage Isolation Current Sensor with Integrated Overcurrent Detection Features and Benefits ▪ Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques ▪ Small footprint package suitable for space-constrained applications ▪ 1 mΩ primary conductor resistance for low power loss ▪ High isolation voltage, suitable for line-powered applications ▪ User-adjustable Overcurrent Fault level ▪ Overcurrent Fault signal typically responds to an overcurrent condition in < 2 μs ▪ Integrated shield virtually eliminates capacitive coupling from current conductor to die due to high dV/dt voltage transients ▪ Filter pin capacitor improves resolution in low bandwidth applications ▪ 3 to 5.5 V, single supply operation ▪ Factory trimmed sensitivity and quiescent output voltage ▪ Chopper stabilization results in extremely stable quiescent output voltage ▪ Ratiometric output from supply voltage The Allegro™ ACS710 current sensor provides economical and precise means for current sensing applications in industrial, commercial, and communications systems. The device is offered in a small footprint surface mount package that allows easy implementation in customer applications. Package: 16-pin SOIC Hall Effect IC Package (suffix LA) The ACS710 consists of a precision linear Hall sensor integrated circuit with a copper conduction path located near the surface of the silicon die. Applied current flows through the copper conduction path, and the analog output voltage from the Hall sensor linearly tracks the magnetic field generated by the applied current. The accuracy of the ACS710 is maximized with this patented packaging configuration because the Hall element is situated in extremely close proximity to the current to be measured. High level immunity to current conductor dV/dt and stray electric fields, offered by Allegro proprietary integrated shield technology, results in low ripple on the output and low offset drift in high-side, high voltage applications. The voltage on the Overcurrent Input (VOC pin) allows customers to define an overcurrent fault threshold for the device. When the current flowing through the copper conduction path (between the IP+ and IP– pins) exceeds this threshold, the open drain Overcurrent Fault pin will transition to a logic low state. Factory programming of the linear Hall sensor inside of the ACS710 results in exceptional accuracy in both analog and digital output signals. The internal resistance of the copper path used for current sensing is typically 1 mΩ, for low power loss. Also, the current conduction path is electrically isolated from the low voltage Continued on the next page… Typical Application Circuit 1 2 3 4 IP Noise and bandwidth limiting filter capacitor Fault delay setting capacitor, 22 nF maximum Use of resistor optional, 330 kΩ recommended. If used, resistor must be connected between ¯ ¯¯¯ ¯ pin and VCC. ¯ L¯ ¯ FAU¯ T Sets resistor divider reference for VOC

120 kHz Bandwidth, High Voltage Isolation Current Sensor with Integrated Overcurrent Detection Description (continued) sensor inputs and outputs. This allows the ACS710 family of sensors to be used in applications requiring electrical isolation, without the use of opto-isolators or other costly isolation techniques. Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory. The ACS710 is provided in a small, surface mount SOIC16 package. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free...

120 kHz Bandwidth, High Voltage Isolation Current Sensor with Integrated Overcurrent Detection Absolute Maximum Ratings Characteristic Supply Voltage Overcurrent Input Pin ¯ L¯ ¯ Overcurrent ¯ ¯¯¯ ¯ Pin FAU¯ T Fault Enable (FAULT_EN) Pin Voltage Reference Output Pin DC Reverse Voltage: VCC, FILTER, VIOUT, VOC, ¯ ¯¯¯ ¯ , FAULT_EN, and VZCR Pins ¯ L¯ ¯ FAU¯ T Excess to Supply Voltage: FILTER, VIOUT, VOC, ¯ ¯¯¯ ¯ , FAULT_EN, and VZCR Pins ¯ L¯ ¯ FAU¯ T Output Current Source Output Current Sink Operating Ambient Temperature Voltage by which pin voltage can exceed the VCC pin voltage Junction...

120 kHz Bandwidth, High Voltage Isolation Current Sensor with Integrated Overcurrent Detection Functional Block Diagram Latching Version VCC Hall Bias Fault Latch FAULT Reset Drain Control Logic Fault Comparator – Sensitivity Trim Signal Recovery Hall Amplifier Terminal List Table, Latching Version Number Sensed current copper conduction path pins. Terminals for current being sensed; fused internally, loop to IP+ pins; unidirectional or bidirectional current flow. Device ground connection. Voltage Reference Output pin. Zero current (0 A) reference; output voltage on this pin scales with VCC...

120 kHz Bandwidth, High Voltage Isolation Current Sensor with Integrated Overcurrent Detection Functional Block Diagram Non-Latching Version VCC Hall Bias FAULT Reset 3 mA OC Fault VZCR Fault Comparator Signal Recovery Hall Amplifier Terminal List Table, Non-Latching Version Number Sensed current copper conduction path pins. Terminals for current being sensed; fused internally, loop to IP+ pins; unidirectional or bidirectional current flow. Device ground connection. Voltage Reference Output pin. Zero current (0 A) reference; output voltage on this pin scales with VCC . (Not a highly...

120 kHz Bandwidth, High Voltage Isolation Current Sensor with Integrated Overcurrent Detection COMMON OPERATING CHARACTERISTICS Valid at TA = –40°C to 125°C, VCC = 5 V, unless otherwise specified Characteristic ELECTRICAL CHARACTERISTICS Supply Voltage1 Nominal Supply Voltage Supply Current Output Capacitance Load Output Resistive Load Magnetic Coupling from Device Conductor to Hall Element Internal Filter Resistance2 Test Conditions ¯ L¯ ¯ VIOUT open, ¯ ¯¯¯ ¯ pin high FAU¯ T VIOUT pin to GND VIOUT pin to GND Current flowing from IP+ to IP– pins VCC VCCN ICC CLOAD RLOAD MCHALL Primary...