ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package FEATURES AND BENEFITS DESCRIPTION * Patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor * UL60950-1 (ed. 2) certified Dielectric Strength Voltage = 2.4 kVrms Basic Isolation Working Voltage = 420 Vpk/297Vrms * Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter designtechniques * Pin-selectable bandwidth: 80 kHz for high bandwidth applications or 20 kHz for low-noise performance * 0.65 m primary conductor resistance for low power loss and high inrush current withstand capability * Small footprint, low-profile SOIC8 package suitable for space-constrained applications * Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients * 4.5 to 5.5V, single supply operation * Output voltage proportional to AC or DC current * Factory-trimmed sensitivity and quiescent output voltage for improved accuracy The AllegroTM ACS723 current sensor IC is an economical and precise solution for AC or DC current sensing in industrial, 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. 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 includes Allegro's patented digital temperature compensation, resulting in extremely accurate performance over temperature. 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 0.65 m typical, providing low power loss. Continued on the next page... TUV America Certificate Number: U8V 18 02 54214 041 CB 14 11 54214 031 UL Certified File No.: US-32848-UL PACKAGE: 8-pin SOIC (suffix LC) The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS723 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. Continued on the next page... Not to scale 1 8 IP+ +I P VCC ACS723 2 7 IP+ VIOUT CBYPASS 0.1 F IP 3 IP- BW_SEL IP- GND 6 -IP CL 4 5 The ACS723 outputs an analog signal, VIOUT, that changes, proportionally, with the bidirectional AC or DC primary sensed current, IP, within the specified measurement range. The BW_SEL pin can be used to select one of the two bandwidths to optimize the noise performance. Grounding the BW_SEL pin puts the part in the high bandwidth, 80 kHz, mode. Typical Application ACS723-DS, Rev. 6 MCO-0000538 September 3, 2019 ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package FEATURES AND BENEFITS (continued) DESCRIPTION (continued) * Chopper stabilization results in extremely stable quiescent output voltage * Nearly zero magnetic hysteresis * Ratiometric output from supply voltage The ACS723 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 Part Number IPR (A) ACS723LLCTR-05AB-T [2] 5 ACS723LLCTR-10AU-T [2] 10 ACS723LLCTR-10AB-T [2] 10 ACS723LLCTR-20AU-T [2] 20 ACS723LLCTR-20AB-T [2] 20 Sens(Typ) at VCC = 5 V (mV/A) TA (C) Packing [1] -40 to 150 Tape and Reel, 3000 pieces per reel 400 200 100 ACS723LLCTR-40AU-T [2] 40 ACS723LLCTR-40AB-T [2] 40 50 ACS723LLCTR-50AB-T [2] 50 40 [1] Contact Allegro [2] Variant for additional packing options. not intended for automotive applications. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 2 ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Supply Voltage Rating Units VCC Notes 6 V Reverse Supply Voltage VRCC -0.1 V Output Voltage VIOUT 25 V Reverse Output Voltage VRIOUT -0.1 V Maximum Continuous Current ICMAX TA = 25C 65 A TA Range L -40 to 150 C Operating Ambient Temperature Junction Temperature TJ(max) 165 C Storage Temperature Tstg -65 to 165 C Rating Unit 2400 VRMS 420 VPK or VDC 297 VRMS ISOLATION CHARACTERISTICS Characteristic Symbol Dielectric Strength Test Voltage Working Voltage for Basic Isolation VISO VWVBI Clearance Creepage Notes Agency type-tested for 60 seconds per UL 60950-1 (edition. 2). Production tested at VISO for 1 second, in accordance with UL 60950-1 (edition. 2). Maximum approved working voltage for basic (single) isolation according UL 60950-1 (edition 2). Dcl Minimum distance through air from IP leads to signal leads. 3.9 mm Dcr Minimum distance along package body from IP leads to signal leads. 3.9 mm Value Units THERMAL CHARACTERISTICS Characteristic Symbol Test Conditions* mm2 Package Thermal Resistance (Junction to Ambient) RJA Mounted on the Allegro 85-0593 evaluation board with 400 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 ASEK723 evaluation board. 5 C/W *Additional thermal information available on the Allegro website. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 3 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 VCC Master Current Supply To All Subcircuits Programming Control POR Hall Current Drive Temperature Sensor EEPROM and Control Logic Offset Control IP+ Sensitivity Control IP- Dynamic Offset Cancellation IP+ Tuned Filter VIOUT IP- BW_SEL GND Functional Block Diagram Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 4 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 PINOUT DIAGRAM AND TERMINAL LIST IP+ 1 8 VCC IP+ 2 7 VIOUT IP- 3 6 BW_SEL IP- 4 5 GND Pinout Diagram Terminal List Table Number Name 1, 2 IP+ Terminals for current being sensed; fused internally Description 3, 4 IP- Terminals for current being sensed; fused internally 5 GND 6 BW_SEL 7 VIOUT 8 VCC Signal ground terminal Terminal for selecting 20 kHz or 80 kHz bandwidth Analog output signal Device power supply terminal Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 5 ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package COMMON ELECTRICAL CHARACTERISTICS [1]: Valid through the full range of TA = -40C to 150C, and at VCC= 5V, unless otherwisespecified Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage VCC 4.5 5 5.5 V Supply Current ICC VCC within VCC(min) and VCC(max) - 9 14 mA Output Capacitance Load CL VIOUT to GND - - 10 nF Output Resistive Load RL VIOUT to GND 4.7 - - k Primary Conductor Resistance RIP TA = 25C - 0.65 - m Magnetic Coupling Factor CF Rise Time Propagation Delay Response Time Internal Bandwidth Noise Density Noise Nonlinearity Saturation Voltage [2] Power-On Time tr tpd tRESPONSE BWi IND IN - 10 - G/A IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to GND - 4 - s IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to VCC - 17.5 - s IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to GND - 1 - s IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to VCC - 5 - s IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to GND - 5 - s IP = IP(max), TA = 25C, CL = 1 nF, BW_SEL tied to VCC - 22.5 - s Small signal -3dB; CL = 1 nF, BW_SEL tied to GND - 80 - kHz Small signal -3dB; CL = 1nF, BW_SEL tied to VCC - 20 - kHz Input referenced noise density; TA = 25C, CL = 1 nF - 110 - A(rms)/ Hz Input referenced noise; BWi = 80 kHz, TA= 25C, CL = 1 nF - 30 - mA(rms) Input referenced noise; BWi = 20 kHz, TA= 25C, CL = 1 nF - 15 - mA(rms) ELIN Through full range of IPR - 1 - % VOH RL = 4.7 k, TA = 25C VCC - 0.5 - - V VOL RL = 4.7 k, TA = 25C - - 0.5 V tPO Output reaches 90% of steady-state level, TA = 25C, IP = IPR(max) applied - 64 - s [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] 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 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 6 ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package xLLCTR-5AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units -5 - 5 A - 400 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V TA = 25C to 150C; measured at IP = IPR(max) -2 - 2 % NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Sensitivity Error Offset Voltage [1] Total Output Error [2] Esens VOE TA = -40C to 25C; measured at IP = IPR(max) IP = 0 A; TA = 25C to 150C IP = 0 A; TA = -40C to 25C - 2.5 - % -15 - 15 mV - 20 - mV IP = IPR(max), TA = 25C to 150C -2.5 - 2.5 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % ETOT LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] [2] Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max). Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 7 ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package 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. Max. Units 0 - 10 A - 400 - mV/A Unidirectional; IP = 0 A - VCC x 0.1 - V TA = 25C to 150C; measured at IP = IPR(max) -2 - 2 % NOMINAL PERFORMANCE Current Sensing Range IPR Sensitivity Sens Zero Current Output Voltage VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Sensitivity Error Esens Offset Voltage [1] VOE Total Output Error [2] TA = -40C to 25C; measured at IP = IPR(max) IP = 0 A; TA = 25C to 150C IP = 0 A; TA = -40C to 25C - 2.5 - % -15 - 15 mV - 20 - mV IP = IPR(max), TA = 25C to 150C -2.5 - 2.5 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Typ. Max. Units ETOT LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] [2] Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max). xLLCTR-10AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) -10 - 10 A IPR(min) < IP < IPR(max) - 200 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V ACCURACY PERFORMANCE Sensitivity Error Esens Offset Voltage [1] VOE Total Output Error [2] ETOT TA = 25C to 150C; measured at IP = IPR(max) -1.5 - 1.5 % TA = -40C to 25C; measured at IP = IPR(max) - 2 - % IP = 0 A; TA = 25C to 150C -10 - 10 mV IP = 0 A; TA = -40C to 25C - 15 - mV IP = IPR(max), TA = 25C to 150C -2 - 2 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] [2] Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max). Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 8 ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package 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. Max. Units 0 - 20 A - 200 - mV/A - VCC x 0.1 - V -1.5 - 1.5 % NOMINAL PERFORMANCE Current Sensing Range IPR Sensitivity Sens Zero Current Output Voltage VIOUT(Q) IPR(min) < IP < IPR(max) Unidirectional; IP = 0 A ACCURACY PERFORMANCE Sensitivity Error Esens Offset Voltage [1] VOE Total Output Error [2] TA = 25C to 150C; measured at IP = IPR(max) TA = -40C to 25C; measured at IP = IPR(max) IP = 0 A; TA = 25C to 150C - 2 - % -10 - 10 mV IP = 0 A; TA = -40C to 25C - 15 - mV IP = IPR(max), TA = 25C to 150C -2 - 2 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Typ. Max. Units ETOT LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] [2] Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max). xLLCTR-20AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) -20 - 20 A IPR(min) < IP < IPR(max) - 100 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V ACCURACY PERFORMANCE Sensitivity Error Esens Offset Voltage [1] VOE Total Output Error [2] ETOT TA = 25C to 150C; measured at IP = IPR(max) -1.5 - 1.5 % TA = -40C to 25C; measured at IP = IPR(max) - 2 - % IP = 0 A; TA = 25C to 150C -10 - 10 mV IP = 0 A; TA = -40C to 25C - 15 - mV IP = IPR(max), TA = 25C to 150C -2 - 2 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] [2] Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max). Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 9 ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package 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. Max. Units 0 - 40 A - 100 - mV/A - VCC x 0.1 - V Nominal Performance Current Sensing Range IPR Sensitivity Sens Zero Current Output Voltage VIOUT(Q) IPR(min) < IP < IPR(max) Unidirectional; IP = 0 A Accuracy Performance Sensitivity Error Esens Offset Voltage [1] VOE Total Output Error [2] ETOT TA = 25C to 150C; measured at IP = IPR(max) -1.5 - 1.5 % TA = -40C to 25C; measured at IP = IPR(max) - 2 - % IP = 0 A; TA = 25C to 150C -10 - 10 mV IP = 0 A; TA = -40C to 25C - 15 - mV IP = IPR(max), TA = 25C to 150C -2 - 2 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Typ. Max. Units Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] [2] Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max). xLLCTR-40AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) -40 - 40 A IPR(min) < IP < IPR(max) - 50 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V ACCURACY PERFORMANCE Sensitivity Error Esens Offset Voltage [1] VOE Total Output Error [2] ETOT TA = 25C to 150C; measured at IP = IPR(max) -1.5 - 1.5 % TA = -40C to 25C; measured at IP = IPR(max) - 2 - % IP = 0 A; TA = 25C to 150C -10 - 10 mV IP = 0 A; TA = -40C to 25C - 15 - mV IP = IPR(max), TA = 25C to 150C -2 - 2 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] [2] Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max). Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 10 ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package xLLCTR-50AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units -50 - 50 A - 40 - mV/A - VCC x 0.5 - V -1.5 - 1.5 % 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 Sensitivity Error Offset Voltage [1] Total Output Error [2] Esens VOE TA = 25C to 150C; measured at IP = IPR(max) TA = -40C to 25C; measured at IP = IPR(max) IP = 0 A; TA = 25C to 150C - 2 - % -10 - 10 mV IP = 0 A; TA = -40C to 25C - 15 - mV IP = IPR(max), TA = 25C to 150C -2 - 2 % IP = IPR(max), TA = -40C to 25C - 3 - % Esens_drift - 2 - % Etot_drift - 2 - % ETOT Lifetime Drift Characteristics Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] [2] Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. Percentage of IP, with IP = IPR(max). Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 11 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 CHARACTERISTIC PERFORMANCE xLLCTR-5AB Key Parameters Offset Voltage vs. Temperature 30 2520 20 2510 10 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 2530 2500 2490 2480 2470 2460 -50 0 -10 -20 -30 0 50 100 -40 -50 150 0 Temperature (C) 410 3 405 2 Sensitivity Error (%) Sensitivity (mV/A) 4 400 395 390 385 150 1 0 -1 -2 -3 -4 0 50 100 150 -50 0 Temperature (C) 50 100 150 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) 100 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 415 380 -50 50 Temperature (C) 0.20 0.00 -0.20 -0.40 -0.60 1 0 -1 -2 -3 -0.80 -4 -1.00 -50 -5 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 12 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 xLLCTR-10AB Key Parameters Offset Voltage vs. Temperature 5 2500 0 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 2505 2495 2490 2485 2480 -5 -10 -15 -20 2475 -25 -50 0 50 100 150 -50 0 Temperature (C) 150 100 150 Sensitivity Error vs. Temperature 212 6 210 208 4 5 Sensitivity Error (%) Sensitivity (mV/A) 100 Temperature (C) Sensitivity vs. Temperature 206 204 202 200 198 3 2 1 0 -1 196 -2 194 -3 192 -4 -50 0 50 100 150 -50 0 Temperature (C) 50 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) 50 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -0.60 -3 -0.80 -4 -1.00 -5 -50 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 13 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 xLLCTR-10AU Key Parameters Offset Voltage vs. Temperature 30 520 20 510 10 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 530 500 490 480 470 460 -50 0 -10 -20 -30 0 50 100 -40 -50 150 0 Temperature (C) 100 150 4 3 Sensitivity Error (%) 410 Sensitivity (mV/A) 150 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 405 400 395 390 2 1 0 -1 -2 -3 -4 0 50 100 150 -50 0 Temperature (C) 50 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) 100 Temperature (C) 415 385 -50 50 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -0.60 -3 -0.80 -4 -1.00 -5 -50 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 14 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 xLLCTR-20AB Key Parameters Offset Voltage vs. Temperature Zero Current Output Voltage vs. Temperature 4 2502 2 2500 0 Offset Voltage (mV) 2504 VIOUT(Q) (mV) 2498 2496 2494 2492 2490 2488 -2 -4 -6 -8 -10 -12 2486 -14 2484 -50 -16 0 50 100 150 -50 0 Temperature (C) 50 100 150 100 150 Temperature (C) Sensitivity Error vs. Temperature Sensitivity vs. Temperature 105 5 4 104 Sensitivity Error (%) Sensitivity (mV/A) 3 103 102 101 100 2 1 0 -1 -2 -3 99 -4 98 -5 0 -50 50 100 150 -50 0 Temperature (C) Total Error at IPR(max) vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) Nonlinearity vs. Temperature 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -0.60 -3 -0.80 -4 -5 -1.00 -50 0 50 50 Temperature (C) 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 15 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 xLLCTR-20AU Key Parameters Offset Voltage vs. Temperature 15 510 10 505 5 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 515 500 495 490 485 0 -5 -10 -15 480 -20 475 -25 470 -50 0 100 50 -30 -50 150 0 Temperature (C) 5 208 4 100 150 3 206 Sensitivity Error (%) Sensitivity (mV/A) 150 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 204 202 200 198 2 1 0 -1 -2 -3 -4 0 50 100 150 -50 0 Temperature (C) 50 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 5 0.80 4 0.60 3 0.40 2 Total Error (%) Nonlinearity (%) 100 Temperature (C) 210 196 -50 50 0.20 0.00 -0.20 -0.40 -0.60 1 0 -1 -2 -3 -0.80 -4 -1.00 -5 -50 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 16 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 xLLCTR-40AB Key Parameters Offset Voltage vs. Temperature 4 2502 2 2500 0 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 2504 2498 2496 2494 2492 -2 -4 -6 -8 2490 -10 2488 -12 2486 -50 -14 0 100 50 150 -50 0 Temperature (C) 150 100 150 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 2 51 1 Sensitivity Error (%) Sensitivity (mV/A) 100 Temperature (C) 51 50 50 49 49 48 -50 50 0 -1 -2 -3 -4 0 50 100 150 -50 0 Temperature (C) 50 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1.00 2 0.80 1 0.40 Total Error (%) Nonlinearity (%) 0.60 0.20 0.00 -0.20 -0.40 -0.60 0 -1 -2 -3 -0.80 -1.00 -4 -50 0 50 100 150 -50 Temperature (C) 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 17 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 xLLCTR-40AU Key Parameters Offset Voltage vs. Temperature 10 505 5 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 510 500 495 490 485 480 -50 0 -5 -10 -15 0 100 50 -20 -50 150 0 Temperature (C) 150 100 150 Sensitivity Error vs. Temperature 104 4 103 3 Sensitivity Error (%) 103 Sensitivity (mV/A) 100 Temperature (C) Sensitivity vs. Temperature 102 102 101 101 100 100 2 1 0 -1 -2 -3 99 99 -4 -50 0 50 100 150 -50 Temperature (C) 0 50 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 0.20 0.00 -0.20 -0.40 1 0 -1 -2 -0.60 -3 -0.80 -1.00 -4 -50 0 50 100 150 Temperature (C) Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 18 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 DEFINITIONS OF ACCURACY CHARACTERISTICS Sensitivity (Sens) The change in sensor IC output in response to a 1A 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. 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 Figures 1 and 2. Figure 1 shows a distribution of output voltages versus IP at 25C and across temperature. Figure2 shows the corresponding ETOT versus IP. Nonlinearity (ELIN) Increasing VIOUT (V) 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: { [ ELIN = 1- VIOUT (IPR(max)) - VIOUT(Q) 2 x VIOUT (IPR(max)/2) - VIOUT(Q) [{ 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. Accuracy at 25C Only IPR(min) -IP (A) Full Scale IP Accuracy at 25C Only Decreasing VIOUT (V) Accuracy Across Temperature Figure 1: Output voltage versus sensed current +ETOT 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. Across Temperature Total Output Error (ETOT) 25C Only 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: VIOUT_ideal(IP) - VIOUT(IP) Sensideal(IP) x IP IPR(max) 0A Offset Voltage (VOE) ETOT(IP) = +IP (A) VIOUT(Q) 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 = 5V translates into VIOUT(Q) = 2.5V. Variation in VIOUT(Q) can be attributed to the resolution of the Allegro linear IC quiescent voltage trim and thermal drift. Accuracy at 25C Only Ideal VIOUT Accuracy Across Temperature x 100 (%) Accuracy Across Temperature -IP +IP x 100 (%) The Total Output Error incorporates all sources of error and is a function of IP. At relatively high currents, ETOT will be mostly -ETOT Figure 2: Total Output Error versus sensed current Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 19 ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package APPLICATION INFORMATION Impact of External Magnetic Fields The ACS723 works by sensing the magnetic field created by the current flowing through the package. However, the sensor cannot differentiate between fields created by the current flow and external magnetic fields. This means that external magnetic fields can cause errors in the output of the sensor. Magnetic fields which are perpendicular to the surface of the package affect the output of the sensor, as it only senses fields in that one plane. The error in Amperes can be quantified as: Error(B) = B CF where B is the strength of the external field perpendicular to the surface of the package in Gauss, and CF is the coupling factor in G/A. Then, multiplying by the sensitivity of the part, Sens, gives the error in mV. For example, an external field of 1 Gauss will result in around 0.1A of error. If the ACS723LLCTR-10AB is being used--which has a nominal sensitivity of 200 mV/A--that equates to 20 mV of error on the output of the sensor. Error (mV) External Field (Gauss) Error (A) 5AB 10AB 20AB 40AB 0.5 0.05 20 10 5 2.5 1 0.1 40 20 10 5 2 0.2 80 40 20 10 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 20 ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package Thermal Rise vs. Primary Current Self-heating due to the flow of 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. 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 3 shows the measured rise in steady-state die temperature of the ACS723 versus continuous current at an ambient temperature, TA, of 25 C. The thermal offset curves may be directly applied to other values of TA. Conversely, Figure 4 shows the maximum continuous current at a given TA. Surges beyond the maximum current listed in Figure 4 are allowed given the maximum junction temperature, TJ(MAX) (165), is not exceeded. The thermal capacity of the ACS723 should be verified by the end user in the application's specific conditions. The maximum junction temperature, TJ(MAX) (165), 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. ASEK723 Evaluation Board Layout Thermal data shown in Figure 3 was collected using the ASEK723 Evaluation Board (TED-85-0702-002). This board includes 1388mm2 of 4 oz. copper (0.1388) 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 5. Figure 3: Self-Heating in the LC2 Package Due to Current Flow Figure 5: Top and Bottom Layers for ASEK723 Evaluation Board Gerber files for the ASEK723 evaluation board are available for download from the Allegro website. See the technical documents section of the ACS723 device webpage. Figure 4: Maximum Continuous Current at a Given TA Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 21 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 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(min.) t1 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. 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 t Figure 6: Power-On Time (tPO) (%) 90 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. VIOUT 90% VIOUT 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. VCC VCC(typ.) Primary Current VIOUT Rise Time, tr 20 10 0 Propagation Delay, tpd t Figure 7: Rise Time (tr) and Propagation Delay (tpd) (%) 90 Primary Current VIOUT Response Time, tRESPONSE 0 t Figure 8: Response Time (tRESPONSE) Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 22 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package ACS723 PACKAGE OUTLINE 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 8 0 4.90 0.10 1.27 0.65 8 8 1.75 0.25 0.17 3.90 0.10 5.60 6.00 0.20 A 1.04 REF 1 2 1 1.27 0.40 C 2 PCB Layout Reference View 0.25 BSC Branded Face SEATING PLANE GAUGE PLANE C 8X 1.75 MAX 0.10 C 0.51 0.31 SEATING PLANE NNNNNNN TPP-AAA LLLLL 0.25 0.10 1.27 BSC 1 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 B Standard Branding Reference View N = Device part number T = Device temperature range P = Package Designator A = Amperage L = Lot number Belly Brand = Country of Origin Figure 9: Package LC, 8-pin SOICN Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 23 ACS723 High-Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package Revision History Number Date Description - June 10, 2014 1 October 29, 2014 Initial release. Added Magnetic Coupling Factor characteristic and Error Due to External Magnetic Fields section 2 April 30, 2015 3 December 16, 2015 Added Characteristic Performance graphs Added ACS723LLCTR-50AB-T variant 4 December 13, 2018 Added TUV/UL certificates 5 June 3, 2019 6 September 3, 2019 Updated TUV certificate mark Added Maximum Continuous Current to Absolute Maximum Ratings table (page 3) and thermal data section (page 21) Copyright 2019, Allegro MicroSystems. Allegro MicroSystems 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 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 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 24