ACS724 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package FEATURES AND BENEFITS DESCRIPTION * AEC-Q100 qualified * Differential Hall sensing rejects common-mode fields * 1.2 m primary conductor resistance for low power loss and high inrush current withstand capability * Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients * Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques * High-bandwidth 120 kHz analog output for faster response times in control applications * Filter pin allows user to filter the output for improved resolution at lower bandwidth * Patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor * Small-footprint, low-profile SOIC8 package suitable for space-constrained applications * Filter pin simplifies bandwidth limiting for better resolution at lower frequencies The AllegroTM ACS724 current sensor IC is an economical and precise solution for AC or DC current sensing in industrial, automotive, commercial, and communications systems. The small package is ideal for space-constrained applications while also saving costs due to reduced board area. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. The device consists of a precise, low-offset, linear Hall sensor 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 is sensed by the integrated Hall IC and converted into a proportional voltage. The current is sensed differentially in order to reject common-mode fields, improving accuracy in magnetically noisy environments. The inherent device accuracy is optimized through the close proximity of the magnetic field 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 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 sensing. The internal resistance of this conductive path is 1.2 m typical, providing low power loss. Continued on the next page... pe d Ty ste te TUV America Certificate Number: U8V 18 02 54214 041 CB 14 11 54214 031 CB Certificate Number: US-32848-UL The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS724 current sensor IC to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques. PACKAGE: 8-Pin SOIC (suffix LC) Continued on the next page... Not to scale 1 +IP 2 IP+ IP+ VCC ACS724 VIOUT IP 3 -IP 4 IP- IP- 8 FILTER GND 7 CBYPASS 0.1 F 6 5 CF 1 nF CLOAD The ACS724 outputs an analog signal, VIOUT , that changes proportionally with the bidirectional AC or DC primary sensed current, IP , within the specified measurement range. The FILTER pin can be used to decrease the bandwidth in order to optimize the noise performance. Typical Application ACS724-DS, Rev. 14 MCO-0000227 December 13, 2018 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 FEATURES AND BENEFITS (continued) * 5 V, single supply operation * Output voltage proportional to AC or DC current * Factory-trimmed sensitivity and quiescent output voltage for improved accuracy * Chopper stabilization results in extremely stable quiescent output voltage * Nearly zero magnetic hysteresis * Ratiometric output from supply voltage DESCRIPTION (continued) The ACS724 is provided in a small, low-profile surface-mount SOIC8 package. 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 flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory. SELECTION GUIDE Sens(Typ) at VCC = 5 V (mV/A) Part Number IPR (A) ACS724LLCTR-2P5AB-T 2.5 800 ACS724LLCTR-05AB-T 5 400 ACS724LLCTR-10AU-T 10 400 ACS724LLCTR-10AB-T 10 ACS724LLCTR-20AU-T 20 ACS724LLCTR-20AB-T 20 100 ACS724LLCTR-30AU-T 30 133 TA (C) Packing* -40 to 150 Tape and Reel, 3000 pieces per reel 200 ACS724LLCTR-30AB-T 30 66 ACS724LLCTR-40AU-T 40 100 ACS724LLCTR-50AB-T 50 40 *Contact Allegro for additional packing options. Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 2 ACS724 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Units Supply Voltage VCC 6 V Reverse Supply Voltage VRCC -0.1 V Output Voltage VIOUT VCC + 0.5 V Reverse Output Voltage VRIOUT Operating Ambient Temperature TA Range L -0.1 V -40 to 150 C Junction Temperature TJ(max) 165 C Storage Temperature Tstg -65 to 165 C ISOLATION CHARACTERISTICS Characteristic Dielectric Surge Strength Test Voltage Dielectric Strength Test Voltage Working Voltage for Basic Isolation Clearance Creepage Symbol Notes Rating Unit VSURGE Tested 5 pulses at 2/minute in compliance to IEC 61000-4-5 1.2 s (rise) / 50 s (width). 6000 V Agency type-tested for 60 seconds per UL standard 609501 (edition 2); production-tested at VISO for 1 second, in accordance with UL 60950-1 (edition 2). 2400 VRMS VISO Maximum approved working voltage for basic (single) isolation according to UL 60950-1 (edition 2) 420 Vpk or VDC 297 Vrms Dcl Minimum distance through air from IP leads to signal leads. 4.2 mm Dcr Minimum distance along package body from IP leads to signal leads. 4.2 mm VWVBI THERMAL CHARACTERISTICS Characteristic Symbol Test Conditions* Value Units Package Thermal Resistance (Junction to Ambient) RJA Mounted on the Allegro 85-0740 evaluation board with 800 mm2 of 4 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connecting the layers. Performance values include the power consumed by the PCB. 23 C/W Package Thermal Resistance (Junction to Lead) RJL Mounted on the Allegro ASEK724 evaluation board. 5 C/W *Additional thermal information available on the Allegro website. Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 3 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 VCC VCC Master Current Supply To All Subcircuits Programming Control POR Hall Current Drive Temperature Sensor CBYPASS 0.1 F EEPROM and Control Logic Offset Control IP+ Sensitivity Control Dynamic Offset Cancellation IP+ IP- + - RF(int) + - VIOUT IP- GND CF FILTER Functional Block Diagram PINOUT DIAGRAM AND TERMINAL LIST TABLE Terminal List Table IP+ 1 8 VCC IP+ 2 7 VIOUT IP- 3 6 FILTER IP- 4 5 GND Package LC, 8-Pin SOICN Pinout Diagram Number Name 1, 2 IP+ Description Terminals for current being sensed; fused internally 3, 4 IP- 5 GND Terminals for current being sensed; fused internally 6 FILTER Terminal for external capacitor that sets bandwidth 7 VIOUT Analog output signal 8 VCC Signal ground terminal Device power supply terminal Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 4 ACS724 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package COMMON ELECTRICAL CHARACTERISTICS [1]: Valid through the full range of TA , VCC = 5 V, CF = 0, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Unit 4.5 - 5.5 V - 10 14 mA Supply Voltage VCC Supply Current ICC VCC = 5 V, output open Output Capacitance Load CL VIOUT to GND - - 10 nF Output Resistive Load RL VIOUT to GND 4.7 - - k RIP TA = 25C - 1.2 - m - 1.8 - k Primary Conductor Resistance Internal Filter Resistance [2] Common Mode Field Rejection Ratio RF(int) Uniform external magnetic field - 40 - dB Primary Hall Coupling Factor G1 TA = 25C - 11 - G/A Secondary Hall Coupling Factor G2 TA = 25C - 2.8 - G/A Sensmatch Hall Plate Sensitivity Matching CMFRR TA = 25C - 1 - % tr IP = IP(max), TA = 25C, CL = 1 nF - 3 - s tpd IP = IP(max), TA = 25C, CL = 1 nF - 2 - s tRESPONSE IP = IP(max), TA = 25C, CL = 1 nF - 4 - s BW Small signal -3 dB; CL = 1 nF - 120 - kHz Noise Density IND Input-referenced noise density; TA = 25C, CL = 1 nF - 150 - A(rms)/ Hz Noise IN Input-referenced noise: CF = 4.7 nF, CL = 1 nF, BW = 18 kHz, TA = 25C - 20 - mA(rms) -1.5 - +1.5 % Rise Time Propagation Delay Response Time Bandwidth Nonlinearity ELIN Through full range of IP Sensitivity Ratiometry Coefficient SENS_RAT_ COEF VCC = 4.5 to 5.5 V, TA = 25C - 1.3 - - Zero-Current Output Ratiometry Coefficient QVO_RAT_ COEF VCC = 4.5 to 5.5 V, TA = 25C - 1 - - VOH RL = 4.7 k - VCC - 0.3 - V VOL RL = 4.7 k - 0.3 - V tPO Output reaches 90% of steady-state level, TA = 25C, IP = IPR(max) applied - 80 - s Saturation Voltage [3] Power-On Time Shorted Output-to-Ground Current ISC(GND) TA = 25C - 3.3 - mA Shorted Output-to-VCC Current ISC(VCC) TA = 25C - 45 - mA [1] Device may be operated at higher primary current levels, IP , ambient temperatures, TA , and internal leadframe temperatures, provided the Maximum Junction Temperature, TJ(max), is not exceeded. [2] R F(int) forms an RC circuit via the FILTER pin. [3] The sensor IC will continue to respond to current beyond the range of I until the high or low saturation voltage; however, the nonlinearity in this region will be worse than P through the rest of the measurement range. Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 5 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 xLLCTR-2P5AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Unit -2.5 - 2.5 A - 800 - mV/A - VCC x 0.5 - V IP = IPR(max), TA = 25C to 150C -2.5 1.5 2.5 % IP = IPR(max), TA = -40C to 25C -6.5 4.5 6.5 % NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) Bidirectional, IP = 0 A ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE IP = IPR(max), TA = 25C to 150C -2 1 2 % IP = IPR(max), TA = -40C to 25C -6 4.5 6 % IP = 0 A, TA = 25C to 150C -20 7 20 mV IP = 0 A, TA = -40C to 25C -40 13 40 mV LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift -3 1 3 % Total Output Error Lifetime Drift Etot_drift -3 1 3 % [1] Typical values with +/- are 3 sigma values. of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 6 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 xLLCTR-05AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Unit -5 - 5 A - 400 - mV/A - VCC x 0.5 - V IP = IPR(max), TA = 25C to 150C -2.5 1.5 2.5 % IP = IPR(max), TA = -40C to 25C -6 4.5 6 % NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) Bidirectional, IP = 0 A ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE IP = IPR(max), TA = 25C to 150C -2 1 2 % IP = IPR(max), TA = -40C to 25C -5.5 4.5 5.5 % IP = 0 A, TA = 25C to 150C -15 7 15 mV IP = 0 A, TA = -40C to 25C -30 13 30 mV LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift -3 1 3 % Total Output Error Lifetime Drift Etot_drift -3 1 3 % [1] Typical values with +/- are 3 sigma values. of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 7 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 xLLCTR-10AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.[1] Max. Unit 0 - 10 A - 400 - mV/A - VCC x 0.1 - V IP = IPR(max), TA = 25C to 150C -2.5 1.5 2.5 % IP = IPR(max), TA = -40C to 25C -6 4.5 6 % NOMINAL PERFORMANCE Current-Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) Unidirectional, IP = 0 A ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE IP = IPR(max), TA = 25C to 150C -2 1 2 % IP = IPR(max), TA = -40C to 25C -5.5 4.5 5.5 % IP = 0 A, TA = 25C to 150C -15 7 15 mV IP = 0 A, TA = -40C to 25C -30 13 30 mV LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift -3 1 3 % Total Output Error Lifetime Drift Etot_drift -3 1 3 % [1] Typical values with +/- are 3 sigma values. of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 8 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 xLLCTR-10AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ.1 Max. Unit -10 - 10 A - 200 - mV/A Bidirectional, IP = 0 A - VCC x 0.5 - V IP = IPR(max), TA = 25C to 150C -2 1 2 % IP = IPR(max), TA = -40C to 25C -6 4.5 6 % NOMINAL PERFORMANCE Current-Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error2 ETOT TOTAL OUTPUT ERROR COMPONENTS3 ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE IP = IPR(max), TA = 25C to 150C -1.5 1 1.5 % IP = IPR(max), TA = -40C to 25C -5.5 4.5 5.5 % IP = 0 A, TA = 25C to 150C -10 6 10 mV IP = 0 A, TA = -40C to 25C -30 8 30 mV LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift -3 1 3 % Total Output Error Lifetime Drift Etot_drift -3 1 3 % [1] Typical values with +/- are 3 sigma values. of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 9 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 xLLCTR-20AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit 0 - 20 A - 200 - mV/A Unidirectional, IP = 0 A - VCC x 0.1 - V IP = IPR(max), TA = 25C to 150C -2 0.7 2 % IP = IPR(max), TA = -40C to 25C -6 4 6 % IP = IPR(max), TA = 25C to 150C -1.5 0.7 1.5 % IP = IPR(max), TA = -40C to 25C -5.5 4 5.5 % IP = 0 A, TA = 25C to 150C -10 6 10 mV IP = 0 A, TA = -40C to 25C -30 8 30 mV NOMINAL PERFORMANCE Current-Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift -3 1 3 % Total Output Error Lifetime Drift Etot_drift -3 1 3 % [1] Typical values with +/- are 3 sigma values. of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 10 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 xLLCTR-20AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -20 - 20 A - 100 - mV/A Bidirectional, IP = 0 A - VCC x 0.5 - V IP = IPR(max), TA = 25C to 150C -2 0.8 2 % IP = IPR(max), TA = -40C to 25C -6 4 6 % IP = IPR(max), TA = 25C to 150C -1.5 0.6 1.5 % IP = IPR(max), TA = -40C to 25C -5.5 4 5.5 % IP = 0 A, TA = 25C to 150C -10 5 10 mV IP = 0 A, TA = -40C to 25C -30 6 30 mV NOMINAL PERFORMANCE Current-Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift -3 1 3 % Total Output Error Lifetime Drift Etot_drift -3 1 3 % [1] Typical values with +/- are 3 sigma values. of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 11 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 xLLCTR-30AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit 0 - 30 A - 133 - mV/A Unidirectional, IP = 0 A - VCC x 0.1 - V IP = IPR(max), TA = 25C to 150C -2 0.7 2 % IP = IPR(max), TA = -40C to 25C -6 4 6 % IP = IPR(max), TA = 25C to 150C -1.5 0.7 1.5 % IP = IPR(max), TA = -40C to 25C -5.5 4 5.5 % IP = 0 A, TA = 25C to 150C -10 6 10 mV IP = 0 A, TA = -40C to 25C -30 7 30 mV NOMINAL PERFORMANCE Current-Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift -3 1 3 % Total Output Error Lifetime Drift Etot_drift -3 1 3 % [1] Typical values with +/- are 3 sigma values. of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 12 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 xLLCTR-30AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -30 - 30 A - 66 - mV/A Bidirectional, IP = 0 A - VCC x 0.5 - V IP = IPR(max), TA = 25C to 150C -2 0.8 2 % IP = IPR(max), TA = -40C to 25C -6 4 6 % IP = IPR(max), TA = 25C to 150C -1.5 0.8 1.5 % IP = IPR(max), TA = -40C to 25C -5.5 4 5.5 % IP = 0 A, TA = 25C to 150C -10 6 10 mV IP = 0 A, TA = -40C to 25C -30 6 30 mV NOMINAL PERFORMANCE Current-Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift -3 1 3 % Total Output Error Lifetime Drift Etot_drift -3 1 3 % [1] Typical values with +/- are 3 sigma values. of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 13 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 xLLCTR-40AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit 0 - 40 A - 100 - mV/A Unidirectional, IP = 0 A - VCC x 0.1 - V IP = IPR(max), TA = 25C to 150C -2 0.7 2 % IP = IPR(max), TA = -40C to 25C -6 4 6 % IP = IPR(max), TA = 25C to 150C -1.5 0.7 1.5 % IP = IPR(max), TA = -40C to 25C -5.5 4 5.5 % IP = 0 A, TA = 25C to 150C -10 6 10 mV IP = 0 A, TA = -40C to 25C -30 7 30 mV NOMINAL PERFORMANCE Current-Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift -3 1 3 % Total Output Error Lifetime Drift Etot_drift -3 1 3 % [1] Typical values with +/- are 3 sigma values. of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 14 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 xLLCTR-50AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 5 V, CF = 0, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -50 - 50 A - 40 - mV/A Bidirectional, IP = 0 A - VCC x 0.5 - V IP = IPR(max), TA = 25C to 150C -2 0.8 2 % IP = IPR(max), TA = -40C to 25C -6 4 6 % IP = IPR(max), TA = 25C to 150C -1.5 0.8 1.5 % IP = IPR(max), TA = -40C to 25C -5.5 4 5.5 % IP = 0 A, TA = 25C to 150C -10 6 10 mV IP = 0 A, TA = -40C to 25C -30 6 30 mV NOMINAL PERFORMANCE Current-Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift -3 1 3 % Total Output Error Lifetime Drift Etot_drift -3 1 3 % [1] Typical values with +/- are 3 sigma values. of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 15 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 CHARACTERISTIC PERFORMANCE xLLCTR-2P5AB Offset Voltage vs. Temperature Zero Current Output Voltage vs. Temperature 2525 20.00 2520 15.00 Offset Voltage (mV) VIOUT(Q) (mV) 2515 2510 2505 2500 2495 2490 5.00 0.00 -5.00 -10.00 -15.00 2485 2480 10.00 -20.00 -50 0 50 100 150 -50 0 810 4 Sensitivity Error (%) Sensitivity (mV/A) 6 800 790 780 770 0 50 0 -2 -4 100 150 -50 0 Nonlinearity vs. Temperature 100 150 Total Error at IPR(max) vs. Temperature 6 4 Total Error (%) Nonlinearity (%) 50 Temperature (C) Temperature (C) 1.5 1.25 1 0.75 0.5 0.25 0 -0.25 -0.5 -0.75 -1 -1.25 -1.5 150 2 -6 -50 100 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 820 760 50 Temperature (C) Temperature (C) 2 0 -2 -4 -50 0 50 100 150 -6 Temperature (C) -50 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 16 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 CHARACTERISTIC PERFORMANCE xLLCTR-05AB Offset Voltage vs. Temperature 15.00 2510 10.00 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 2515 2505 2500 2495 2490 2485 5.00 0.00 -5.00 -10.00 -15.00 -50 0 50 100 150 -50 0 420 6.00 415 Sensitivity Error (%) Sensitivity (mV/A) 425 8.00 410 405 400 395 390 385 150 4.00 2.00 0.00 -2.00 -4.00 -6.00 380 -8.00 -50 0 50 100 150 -50 0 50 8.00 0.75 6.00 0.50 4.00 Total Error (%) 1.00 0.25 0.00 -0.25 2.00 0.00 -2.00 -0.50 -4.00 -0.75 -6.00 -8.00 -50 0 50 150 Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature -1.00 100 Temperature (C) Temperature (C) Nonlinearity (%) 100 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 375 50 Temperature (C) Temperature (C) 100 150 -50 0 50 Temperature (C) +3 Sigma 100 150 Temperature (C) Average -3 Sigma Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 17 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 CHARACTERISTIC PERFORMANCE xLLCTR-10AU Offset Voltage vs. Temperature 515 15 510 10 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 505 500 495 490 5 0 -5 -10 485 -15 -50 0 50 100 150 -50 0 Temperature (C) 415 4 410 3 405 400 395 390 385 1 0 -1 -2 -3 -4 -5 375 -6 50 100 150 -50 0 Temperature (C) 50 100 150 Temperature (C) Nonlinearity vs. Temperature Total Error at IPR(max) vs. Temperature 1.00 4 0.80 3 0.60 2 0.40 1 Total Error (%) Nonlinearity (%) 150 2 380 0 100 Sensitivity Error vs. Temperature Sensitivity Error (%) Sensitivity (mV/A) Sensitivity vs. Temperature -50 50 Temperature (C) 0.20 0.00 -0.20 -0.40 0 -1 -2 -3 -0.60 -4 -0.80 -5 -6 -1.00 -50 0 50 100 150 -50 Temperature (C) +3 Sigma 0 50 100 150 Temperature (C) Average -3 Sigma Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 18 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 CHARACTERISTIC PERFORMANCE 2510 10 2508 8 2506 6 Offset Voltage (mV) VIOUT(Q) (mV) xLLCTR-10AB Zero Current Output Voltage vs. Temperature 2504 2502 2500 2498 2496 Offset Voltage vs. Temperature 4 2 0 -2 -4 2494 -6 2492 -8 -50 0 50 100 150 -50 0 Temperature (C) 100 150 Sensitivity Error vs. Temperature 210 5 208 4 206 3 Sensitivity Error (%) Sensitivity (mV/A) Sensitivity vs. Temperature 204 202 200 198 196 193 192 2 1 0 -1 -2 -3 -4 190 -5 188 -6 -50 0 50 100 150 -50 0 Temperature (C) 50 100 150 Temperature (C) Nonlinearity vs. Temperature Total Error at IPR(max) vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) 50 Temperature (C) 0.20 0.00 -0.20 -0.40 -0.60 1 0 -1 -2 -3 -4 -0.80 -5 -1.00 -6 -50 0 50 100 -50 150 Temperature (C) +3 Sigma 0 50 100 150 Temperature (C) Average -3 Sigma Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 19 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 CHARACTERISTIC PERFORMANCE 508 8 506 6 504 4 Offset Voltage (mV) VIOUT(Q) (mV) xLLCTR-20AU Zero Current Output Voltage vs. Temperature 502 500 498 496 494 2 0 -2 -4 -6 492 -8 490 -10 -50 0 50 100 Offset Voltage vs. Temperature 150 -50 0 Temperature (C) 100 150 Sensitivity Error vs. Temperature 208 4 206 3 204 2 Sensitivity Error (%) Sensitivity (mV/A) Sensitivity vs. Temperature 202 200 198 196 194 192 1 0 -1 -2 -3 -4 190 -5 -50 0 50 100 -50 150 0 Temperature (C) 50 100 150 Temperature (C) Nonlinearity vs. Temperature Total Error at IPR(max) vs. Temperature 1.00 4 0.80 3 0.60 2 0.40 Total Error (%) Nonlinearity (%) 50 Temperature (C) 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -0.60 -3 -0.80 -4 -1.00 -5 -50 0 50 100 -50 150 Temperature (C) +3 Sigma 0 50 100 150 Temperature (C) Average -3 Sigma Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 20 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 CHARACTERISTIC PERFORMANCE xLLCTR-20AB Zero Current Output Voltage vs. Temperature 10 2508 8 Offset Voltage (mV) 2510 VIOUT(Q) (mV) 2506 2504 2502 2500 2498 6 4 2 0 -2 -4 2496 2494 -50 Offset Voltage vs. Temperature -6 0 50 100 150 -50 0 Temperature (C) 104 4 103 3 102 2 Sensitivity Error (%) Sensitivity (mV/A) 100 150 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 101 100 99 98 97 1 0 -1 -2 -3 -4 96 -5 95 -50 0 50 100 -50 150 0 50 100 150 Temperature (C) Temperature (C) Nonlinearity vs. Temperature Total Error at IPR(max) vs. Temperature 1.00 4 0.80 3 0.60 2 0.40 Total Error (%) Nonlinearity (%) 50 Temperature (C) 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -0.60 -3 -0.80 -4 -1.00 -5 -50 0 50 100 -50 150 Temperature (C) +3 Sigma 0 50 100 150 Temperature (C) Average -3 Sigma Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 21 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 CHARACTERISTIC PERFORMANCE xLLCTR-30AU Zero Current Output Voltage vs. Temperature 8 506 6 Offset Voltage (mV) 508 VIOUT(Q) (mV) 504 502 500 498 496 Offset Voltage vs. Temperature 4 2 0 -2 -4 494 -6 492 -8 -50 0 50 100 150 -50 0 Temperature (C) 50 100 150 Temperature (C) Sensitivity vs. Temperature Sensitivity Error vs. Temperature 4 138 3 Sensitivity Error (%) Sensitivity (mV/A) 136 134 132 130 2 1 0 -1 -2 -3 128 -4 126 -5 -50 0 50 100 -50 150 0 Temperature (C) Nonlinearity vs. Temperature 100 150 Total Error at IPR(max) vs. Temperature 1.00 4 0.80 3 0.60 2 0.40 Total Error (%) Nonlinearity (%) 50 Temperature (C) 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -0.60 -3 -0.80 -4 -1.00 -5 -50 0 50 100 -50 150 Temperature (C) +3 Sigma 0 50 100 150 Temperature (C) Average -3 Sigma Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 22 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 CHARACTERISTIC PERFORMANCE xLLCTR-30AB Offset Voltage vs. Temperature 2510 10 2508 8 2506 6 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 2504 2502 2500 2498 2496 4 2 0 -2 -4 2494 -6 2492 -50 -8 0 50 100 150 -50 0 Temperature (C) Sensitivity vs. Temperature 150 4 3 Sensitivity Error (%) 68 Sensitivity (mV/A) 100 Sensitivity Error vs. Temperature 69 67 66 65 64 63 2 1 0 -1 -2 -3 -4 62 -5 -50 0 50 100 -50 150 0 Temperature (C) 50 100 150 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 4 0.80 3 0.60 2 0.40 Total Error (%) Nonlinearity (%) 50 Temperature (C) 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -3 -0.60 -4 -0.80 -5 -1.00 -50 0 50 100 -50 150 50 100 150 Temperature (C) Temperature (C) +3 Sigma 0 Average -3 Sigma Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 23 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 CHARACTERISTIC PERFORMANCE xLLCTR-40AU Zero Current Output Voltage vs. Temperature Offset Voltage vs. Temperature 510 8.00 508 6.00 Offset Voltage (mV) VIOUT(Q) (mV) 506 504 502 500 498 496 2.00 0.00 -2.00 -4.00 -6.00 494 492 4.00 -50 0 50 100 -8.00 150 -50 0 Temperature (C) 6 103 4 102 Sensitivity Error (%) Sensitivity (mV/A) 150 Sensitivity Error vs. Temperature 104 101 100 99 98 97 96 -50 0 50 100 2 0 -2 -4 -6 150 -50 0 Temperature (C) 50 100 150 Temperature (C) Nonlinearity vs. Temperature Total Error at IPR(max) vs. Temperature 0.5 6 4 0.25 Total Error (%) Nonlinearity (%) 100 Temperature (C) Sensitivity vs. Temperature 95 50 0 -0.25 2 0 -2 -4 -0.5 -50 0 50 100 150 -6 Temperature (C) +3 Sigma -50 0 50 100 150 Temperature (C) Average -3 Sigma Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 24 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 CHARACTERISTIC PERFORMANCE xLLCTR-50AB Offset Voltage vs. Temperature Zero Current Output Voltage vs. Temperature 8.00 2506 6.00 Offset Voltage (mV) 2508 VIOUT(Q) (mV) 2504 2502 2500 2498 2496 2.00 0.00 -2.00 -4.00 -6.00 2494 2492 4.00 -8.00 -50 0 50 100 150 -50 0 150 6.00 44 43 4.00 Sensitivity Error (%) Sensitivity (mV/A) 100 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 42 41 40 39 38 37 36 50 Temperature (C) Temperature (C) 2.00 0.00 -2.00 -4.00 -6.00 -50 0 50 100 150 -50 0 50 100 150 Temperature (C) Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 6.00 0.50 Total Error (%) Nonlinearity (%) 4.00 0.25 0.00 -0.25 -0.50 2.00 0.00 -2.00 -4.00 -6.00 -50 0 50 100 150 +3 Sigma -50 0 50 100 150 Temperature (C) Temperature (C) Average -3 Sigma Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 25 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 CHARACTERISTIC PERFORMANCE ACS724 TYPICAL FREQUENCY RESPONSE ACS724 Frequency Response Magnitude [dB] 5 0 -5 -10 10 1 10 2 10 3 10 4 10 5 10 4 10 5 Frequency [Hz] 50 Phase [] 0 -50 -100 -150 10 1 10 2 10 3 Frequency [Hz] Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 26 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 APPLICATION INFORMATION Estimating Total Error vs. Sensed Current Here, ESENS and VOE are the 3 sigma values for those error terms. If there is an average sensitivity error or average offset voltage, then the average Total Error is estimated as: The Performance Characteristics tables give distribution (3 sigma) values for Total Error at IPR(max); however, one often wants to know what error to expect at a particular current. This can be estimated by using the distribution data for the components of Total Error, Sensitivity Error, and Offset Voltage. The 3 sigma value for Total Error (ETOT) as a function of the sensed current (IP) is estimated as: 2 Total Error (% of Current Measured) ETOT (IP) = ESENS + ( 100 x VOE Sens x IP ETOTAVG (IP) = ESENSAVG + 100 x VOEAVG Sens x IP The resulting total error will be a sum of ETOT and ETOT_AVG. Using these equations and the 3 sigma distributions for Sensitivity Error and Offset Voltage, the Total Error versus sensed current (IP) is below for the ACS724LLCTR-20AB. As expected, as one goes towards zero current, the error in percent goes towards infinity due to division by zero. 2 ) 8 6 -40C + 3 4 -40C - 3 2 25C + 3 0 25C - 3 -2 85C + 3 -4 85C - 3 -6 -8 0 5 10 15 20 Current (A) Figure 1: Predicted Total Error as a Function of the Sensed Current for the ACS724LLCTR-20AB Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 27 ACS724 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package Thermal Rise vs. Primary Current ASEK724/5 Evaluation Board Layout Self-heating due to the flow-off current should be considered during the design of any current sensing system. The sensor, printed circuit board (PCB), and contacts to the PCB will generate heat as current moves through the system. Thermal data shown in Figure 2 was collected using the ASEK724/5 Evaluation Board (TED-85-0740-003). This board includes 1500 mm2 of 2 oz. copper (0.0694 mm) connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connecting the layers. Top and bottom layers of the PCB are shown below in Figure 3. The thermal response is highly dependent on PCB layout, copper thickness, cooling techniques, and the profile of the injected current. The current profile includes peak current, current "on-time", and duty cycle. While the data presented in this section was collected with direct current (DC), these numbers may be used to approximate thermal response for both AC signals and current pulses. The plot in Figure 2 shows the measured rise in steady-state die temperature of the ACS724 versus DC input current at an ambient temperature, TA, of 25 C. The thermal offset curves may be directly applied to other values of TA. Figure 2: Self Heating in the LA Package Due to Current Flow The thermal capacity of the ACS724 should be verified by the end user in the application's specific conditions. The maximum junction temperature, TJ(MAX) (165C), should not be exceeded. Further information on this application testing is available in the DC and Transient Current Capability application note on the Allegro website. Figure 3: Top and Bottom Layers for ASEK724/5 Evaluation Board Gerber files for the ASEK724/5 evaluation board are available for download from our website. See the technical documents section of the ACS724 device webpage. Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 28 ACS724 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package DEFINITIONS OF ACCURACY CHARACTERISTICS Sensitivity (Sens). The change in sensor IC output in response to a 1 A change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity (G / A) (1 G = 0.1 mT) and the linear IC amplifier gain (mV/G). The linear IC amplifier gain is programmed at the factory to optimize the sensitivity (mV/A) for the full-scale current of the device. Nonlinearity (ELIN). The nonlinearity is a measure of how linear the output of the sensor IC is over the full current measurement range. The nonlinearity is calculated as: VIOUT(IPR(max)) - VIOUT(Q) ELIN = 1- * 100(%) 2 * VIOUT(IPR(max)/2) - VIOUT(Q) Increasing VIOUT (V) Accuracy at 25C Only IPR(min) ETOT (IP) = +IP (A) VIOUT(Q) -IP (A) Full Scale IP IPR(max) 0A Accuracy at 25C Only Decreasing VIOUT (V) Accuracy Across Temperature Figure 4: Output Voltage versus Sensed Current +ETOT Offset Voltage (VOE). The deviation of the device output from its ideal quiescent value of 0.5 x VCC (bidirectional) or 0.1 x VCC (unidirectional) due to nonmagnetic causes. To convert this voltage to amperes, divide by the device sensitivity, Sens. Total Output Error (ETOT). The difference between the current measurement from the sensor IC and the actual current (IP), relative to the actual current. This is equivalent to the difference between the ideal output voltage and the actual output voltage, divided by the ideal sensitivity, relative to the current flowing through the primary conduction path: Accuracy at 25C Only Ideal VIOUT Accuracy Across Temperature where VIOUT(IPR(max)) is the output of the sensor IC with the maximum measurement current flowing through it and VIOUT(IPR(max)/2) is the output of the sensor IC with half of the maximum measurement current flowing through it. Zero-Current Output Voltage (VIOUT(Q)). The output of the sensor when the primary current is zero. For a unipolar supply voltage, it nominally remains at 0.5 x VCC for a bidirectional device and 0.1 x VCC for a unidirectional device. For example, in the case of a bidirectional output device, VCC = 5 V translates into VIOUT(Q) = 2.5 V. Variation in VIOUT(Q) can be attributed to the resolution of the Allegro linear IC quiescent voltage trim and thermal drift. Accuracy Across Temperature Across Temperature 25C Only -IP +IP VIOUT_ideal(IP) - VIOUT (IP) * 100 (%) Sensideal(IP) * IP The Total Output Error incorporates all sources of error and is a function of IP . At relatively high currents, ETOT will be mostly due to sensitivity error, and at relatively low currents, ETOT will be mostly due to Offset Voltage (VOE ). In fact, at IP = 0, ETOT approaches infinity due to the offset. This is illustrated in Figure 4 and Figure 5. Figure 4 shows a distribution of output voltages versus IP at 25C and across temperature. Figure 5 shows the corresponding ETOT versus IP . -ETOT Figure 5: Total Output Error versus Sensed Current Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 29 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 Sensitivity Ratiometry Coefficient (SENS_RAT_COEF). The coefficient defining how the sensitivity scales with VCC. The ideal coefficient is 1, meaning the sensitivity scales proportionally with VCC. A 10% increase in VCC results in a 10% increase in sensitivity. A coefficient of 1.1 means that the sensitivity increases by 10% more than the ideal proportionality case. This means that a 10% increase in VCC results in an 11% increase in sensitivity. This relationship is described by the following equation: Sens(VCC ) = Sens(5 V) 1+ (VCC - 5 V) * SENS_RAT_COEF 5V This can be rearranged to define the sensitivity ratiometry coefficient as: SENS_RAT_COEF = Sens(VCC ) 5V -1 * (VCC - 5 V) Sens(5 V) Zero-Current Output Ratiometry Coefficient (QVO_RAT_ COEF). The coefficient defining how the zero-current output voltage scales with VCC. The ideal coefficient is 1, meaning the output voltage scales proportionally with VCC, always being equal to VCC/2. A coefficient of 1.1 means that the zero-current output voltage increases by 10% more than the ideal proportionality case. This means that a 10% increase in VCC results in an 11% increase in the zero-current output voltage. This relationship is described by the following equation: VIOUTQ(VCC ) = VIOUTQ(5 V) 1+ (VCC - 5 V) * QVO_RAT_COEF 5V This can be rearranged to define the zero-current output ratiometry coefficient as: QVO_RAT_COEF = VIOUTQ(VCC ) 5V -1 * (VCC - 5 V) VIOUTQ(5 V) Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 30 ACS724 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS Power-On Time (tPO). When the supply is ramped to its operating voltage, the device requires a finite time to power its internal components before responding to an input magnetic field. Power-On Time, tPO , is defined as the time it takes for the output voltage to settle within 10% of its steady-state value under an applied magnetic field, after the power supply has reached its minimum specified operating voltage, VCC(min), as shown in the chart at right. V VCC VCC(typ.) VIOUT 90% VIOUT VCC(min.) t1 t2 tPO t1= time at which power supply reaches minimum specified operating voltage t2= time at which output voltage settles within 10% of its steady state value under an applied magnetic field 0 Rise Time (tr). The time interval between a) when the sensor IC reaches 10% of its full-scale value, and b) when it reaches 90% of its full-scale value. The rise time to a step response is used to derive the bandwidth of the current sensor IC, in which (-3 dB) = 0.35 / tr. Both tr and tRESPONSE are detrimentally affected by eddy-current losses observed in the conductive IC ground plane. Propagation Delay (tpd ). The propagation delay is measured as the time interval a) when the primary current signal reaches 20% of its final value, and b) when the device reaches 20% of its output corresponding to the applied current. (%) 90 Figure 6: Power-On Time (tPO) t Primary Current VIOUT Rise Time, tr 20 10 0 Propagation Delay, tpd t Figure 7: Rise Time (tr) and Propagation Delay (tpd) Response Time (tRESPONSE). The time interval between a) when the primary current signal reaches 90% of its final value, and b) when the device reaches 90% of its output corresponding to the applied current. (%) 90 Primary Current VIOUT Response Time, tRESPONSE 0 Figure 8: Response Time (tRESPONSE) Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com t 31 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package ACS724 PACKAGE OUTLING DRAWING For Reference Only - Not for Tooling Use (Reference MS-012AA) Dimensions in millimeters - NOT TO SCALE Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown 4.90 0.10 8 0 D 1.67 0.10 8 0.25 0.17 D1 D2 NNNNNNN 3.90 0.10 6.00 0.20 PPT-AAA A D 1.71 0.10 LLLLL 1.04 REF 1 1 2 B 1.27 0.40 D 2.45 0.10 N = Device part number P = Package Designator T = Device temperature range A = Amperage L = Lot number Belly Brand = Country of Origin 0.25 BSC SEATING PLANE Branded Face GAUGE PLANE C 8X 0.10 1.75 MAX C 0.51 0.31 SEATING PLANE 0.25 0.10 1.27 BSC 1.27 0.65 Package Outline A Terminal #1 mark area B Branding scale and appearance at supplier discretion C Reference land pattern layout (reference IPC7351 SOIC127P600X175-8M); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances. D Hall elements (D1, D2); not to scale 1.27 0.65 8 8 1.27 5.60 7.35 4.20 1.75 7.35 1.575 1 C Standard Branding Reference View 2 PCB Layout Reference View 1 Slot in PCB to maintain 4.2 mm creepage once part is on PCB 1 C 2 PCB Layout Reference View 2 For PCB assemblies that cannot support a slotted design, the above stretched footprint may be used. Figure 9: Package LC, 8-pin SOICN Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 32 ACS724 Automotive-Grade, Galvanically Isolated Current Sensor IC With Common-Mode Field Rejection in a Small-Footprint SOIC8 Package Revision History Number Descriptioon Pages Responsible Date All A. Latham January 16, 2015 - Added Characteristic Performance graphs and Application Information to Preliminary draft to create Final draft 1 Corrected Features and Benefits 2 A. Latham June 19, 2015 2 Added ACS724LLCTR-50AB-T variant with electrical characteristics 2, 9 A. Latham June 23, 2015 3 Corrected Characteristic Performance graph legends; updated Lifetime Drift Characteristics and added Error Over Lifetime electrical characteristics 6-18 A. Latham, S. Milano August 12, 2015 2, 6 W. Bussing August 8, 2016 1 W. Bussing June 28, 2017 14, 21 W. Bussing August 3, 2017 W. Bussing January 10, 2018 W. Bussing January 23, 2018 W. Bussing April 13, 2018 W. Bussing May 14, 2018 4 Added ACS724LLCTR-05AB-T variant with electrical characteristics 5 Added AEC-Q100 qualified status 6 Added ACS724LLCTR-05AB-T and ACS724LLCTR-50AB-T Characteristic Performance graphs 7 Updated Clearance and Creepage rating values 3 Added Dielectric Surge Strength Test Voltage characteristic 2 Added Common Mode Field Rejection Ratio characteristic 5 8 9 10 Added ACS724LLCTR-2P5AB-T variant with electrical characteristics 2, 6 Updated PCB Layout References in Package Outline Drawing 27 Added Hall dimensions in Package Outline Drawing 27 Added ACS724LLCTR-40AU-T variant with electrical characteristics and performance graphs 2, 14, 23 Added ACS724LLCTR-2P5AB-T performance graphs 16 M. McNally Added Typical Frequency Response plots 26 W. Bussing Added "Thermal Rise vs. Primary Current" and "ASEK724/5 Evaluation Board Layout" to the Applications Information section 28 W. Bussing July 3, 2018 13 Corrected ACS724LLCTR-40AU-T Total Output Error and Sensitivity Error values 14 M. McNally November 15, 2018 14 Updated certificate numbers 1 V. Mach December 13, 2018 11 12 June 22, 2018 Copyright (c)2018, Allegro MicroSystems, LLC Allegro MicroSystems, LLC reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro's products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro's product can reasonably be expected to cause bodily harm. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. Copies of this document are considered uncontrolled documents. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems, LLC 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 33