ACS715
14Pages

ACS715 Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Features and Benefits The Allegro™ ACS715 provides economical and precise solutions for DC current sensing in automotive systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switch-mode power supplies, and overcurrent fault protection. Low-noise analog signal path Device bandwidth is set via the FILTER pin 5 μs output rise time in response to step input current 80 kHz bandwidth Total output error 1.5% typical at TA = 25°C Small footprint, low-profile SOIC8 package 1.2 mΩ internal conductor resistance 2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8 5.0 V, single supply operation 133 to 185 mV/A output sensitivity Output voltage proportional to DC currents Factory-trimmed for accuracy Extremely stable output offset voltage Nearly zero magnetic hysteresis Ratiometric output from supply voltage Operating temperature range, –40°C to 150°C The device consists of a precise, low-offset, linear Hall circuit with a copper conduction path located near the surface of 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 voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy after packaging. The output of the device has a positive slope (>VIOUT(Q)) when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sampling. The internal resistance of this conductive path is 1.2 mΩ typical, providing low power loss. The thickness of the copper conductor allows survival of the device at up to 5× overcurrent conditions. The terminals of Package: 8 Lead SOIC (suffix LC) Continued on the next page… Approximate Scale 1:1 Typical Application Application 1. The ACS715 outputs an analog signal, VOUT . that varies linearly with the unidirectional DC primary sampled current, IP , within the range specified. CF is recommended for noise management, with values that depend on the application.

Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Description (continued) the conductive path are electrically isolated from the signal leads (pins 5 through 8). This allows the ACS715 to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free, except for...

Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Functional Block Diagram +5 V VCC (Pin 8) Hall Current Drive Sense Temperature Coefficient Trim Dynamic Offset Cancellation Signal Recovery Sense Trim 0 Ampere Offset Adjust Terminal List Table Number Input terminals for current being sampled; fused internally Output terminals for current being sampled; fused internally Terminal for external capacitor that sets bandwidth Analog output signal Signal ground terminal Device power supply terminal...

Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor COMMON OPERATING CHARACTERISTICS1 over full range of TA, and VCC = 5 V, unless otherwise specified Characteristic Test Conditions ELECTRICAL CHARACTERISTICS Supply Voltage Supply Current Output Capacitance Load Output Resistive Load Primary Conductor Resistance Rise Time Frequency Bandwidth Over full range of IP , IP applied for 5 ms Output reaches 90% of steady-state level, no capacitor on FILTER pin; TJ = 25; 20 A present on leadframe...

Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor x20A PERFORMANCE CHARACTERISTICS over Range E: TA = –40°C to 85°C1, CF = 1 nF, and VCC = 5 V, unless otherwise specified Characteristic Optimized Accuracy Range Sensitivity Symbol Sens Zero Current Output Slope Sensitivity Slope Test Conditions Peak-to-peak, TA = 25°C, 2 kHz external filter, 185 mV/A programmed Sensitivity, CF = 47 nF, COUT = 10 nF, 2 kHz bandwidth Over full range of IP, IP applied for 5 ms; TA = 25°C Electrical Output...

Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor x30A PERFORMANCE CHARACTERISTICS over Range E: TA = –40°C to 85°C1, CF = 1 nF, and VCC = 5 V, unless otherwise specified Characteristic Optimized Accuracy Range Sensitivity Symbol Sens Zero Current Output Slope Sensitivity Slope Test Conditions Peak-to-peak, TA = 25°C, 2 kHz external filter, 133 mV/A programmed Sensitivity, CF = 47 nF, COUT = 10 nF, 2 kHz bandwidth Over full range of IP, IP applied for 5 ms; TA = 25°C Electrical Output...

Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Characteristic Performance IP = 20 A, unless otherwise specified Mean Supply Current versus Ambient Temperature Supply Current versus Supply Voltage Magnetic Offset versus Ambient Temperature Mean Total Output Error versus Ambient Temperature Sensitivity versus Ambient Temperature Nonlinearity versus Ambient Temperature Output Voltage versus Sensed Current 4.5 4.0 Sens (mV/A) Sensitivity versus Sensed Current 0 A Output Voltage versus Ambient...