with Common-Mode Field Rejection in High-Isolation SOIC6 Package FEATURES AND BENEFITS AEC-Q automotive qualified Differential Hall sensing rejects common-mode fields Patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor UL695- (ed. ) certification (pending) Dielectric Strength Voltage =.8 kv RMS Basic Isolation Working Voltage = 97 V RMS Reinforced Isolation Working Voltage = 565 V RMS Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques Filter pin allows user to filter output for improved resolution at lower bandwidth.85 mω primary conductor resistance for low power loss and high inrush current withstand capability Low-profile SOIC6 package suitable for spaceconstrained applications.5 to 5.5 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 PACKAGE: 6-pin SOICW (suffix MA) Not to scale DESCRIPTION The Allegro ACS7LMA current sensor IC is an economical and precise solution for AC or DC current sensing in automotive, industrial, commercial, and communication systems. The small package is ideal for space-constrained applications while also saving costs due to reduced board area. Typical applications include electric vehicles on-board chargers, 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 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 through, to pins 5 through 8), which is the path used for current sensing. The internal resistance of this conductive path is.85 mω typical, providing low power loss. The terminals of the conductive path are electrically isolated from the sensor leads (pins 9 through 6). This allows the ACS7LMA 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 +I P I P I P IP+ IP+ IP+ IP+ 5 6 7 8 IP IP IP IP ACS7LMA 6 NC 5 GND NC FILTER VIOUT NC VCC NC 9 C BYPASS. µf C L C F nf The ACS7LMA outputs an analog signal, V IOUT, that changes proportionally with the bidirectional AC or DC primary sensed current, I P, within the specified measurement range. The FILTER pin can be used to decrease the bandwidth in order to optimize the noise performance. Typical Application ACS7LMA-DS, Rev. 6 MCO- March 9, 8
DESCRIPTION (continued) The ACS7LMA is provided in a low-profile surface-mount SOIC6 package. The leadframe is plated with % matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free. The device is fully calibrated prior to shipment from the factory. SELECTION GUIDE Part Number I PR (A) Sens(Typ) at V CC = 5 V (mv/a) ACS7LMATR-AB-T ± ACS7LMATR-AB-T ± 66 ACS7LMATR-AU-T ACS7LMATR-5AB-T ±5 ACS7LMATR-5AU-T 5 8 ACS7LMATR-65AB-T ±65.75 T A ( C) Packing [] to 5 Tape and Reel, pieces per reel [] Contact Allegro for additional packing options. Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com
SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Units Supply Voltage V CC 6 V Reverse Supply Voltage V RCC. V Output Voltage V IOUT V CC +.5 V Reverse Output Voltage V RIOUT. V Operating Ambient Temperature T A Range L to 5 C Junction Temperature T J (max) 65 C Storage Temperature T stg 65 to 65 C ISOLATION CHARACTERISTICS Characteristic Symbol Notes Rating Unit Tested ±5 pulses at /minute in compliance to IEC 6--5 Dielectric Surge Strength Test Voltage V SURGE. µs (rise) / 5 µs (width). V Dielectric Strength Test Voltage [] V ISO (edition ). Production tested at V RMS for second, in 8 V RMS Agency type-tested for 6 seconds per UL 695- accordance with UL 695- (edition ). Working Voltage for Basic Isolation [] V WVBI Maximum approved working voltage for basic (single) isolation according to UL 695- (edition ). 55 V PK 97 V RMS or VDC Working Voltage for Reinforced Isolation [] V WVRI Maximum approved working voltage for reinforced isolation according to UL 695- (edition ). 8 V PK 565 V RMS or VDC Clearance D cl Minimum distance through air from IP leads to signal leads. 7.5 mm Minimum distance along package body from IP leads to signal Creepage D cr 8. mm leads [] Certification pending. THERMAL CHARACTERISTICS Characteristic Symbol Test Conditions [] Value Units Package Thermal Resistance (Junction to Ambient) Package Thermal Resistance (Junction to Lead) R θja [] Additional thermal information available on the Allegro website. Mounted on the Allegro 85-78 evaluation board with 7 mm of oz. copper on each side, connected to pins and, and to pins and, with thermal vias connecting the layers. Performance values include the power consumed by the PCB. C/W R θjl Mounted on the Allegro ASEK7 evaluation board. 5 C/W Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com
V CC VCC Master Current Supply To All Subcircuits POR Programming Control IP+ IP+ IP+ IP+ Hall Current Drive Temperature Sensor Sensitivity Control EEPROM and Control Logic Offset Control C BYPASS. µf IP IP IP IP Dynamic Offset Cancellation + R F(int) + VIOUT GND C F FILTER Functional Block Diagram IP+ 6 NC IP+ 5 GND IP+ NC IP+ FILTER IP- 5 VIOUT IP- 6 NC IP- 7 VCC IP- 8 9 NC Pinout Diagram Terminal List Table Number Name Description,,, IP+ Terminals for current being sensed; fused internally 5, 6, 7, 8 IP- Terminals for current being sensed; fused internally 9, 6 NC No internal connection; recommended to be left unconnected in order to maintain high creepage VCC Device power supply terminal, NC No internal connection; recommened to connect to GND for the best ESD performance VIOUT Analog output signal FILTER Terminal for external capacitor that sets bandwidth 5 GND Signal ground terminal Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com
COMMON ELECTRICAL CHARACTERISTICS [] : Valid through the full range of T A = C to 5 C and V CC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage V CC.5 5 5.5 V Supply Current I CC V CC within V CC (min) and V CC (max) ma Output Capacitance Load C L VIOUT to GND nf Output Resistive Load R L VIOUT to GND.7 kω Primary Conductor Resistance R IP T A = 5 C.85 mω Internal Filter Resistance [] R F(INT).7 kω Common Mode Field Rejection Ratio CMFRR Uniform external magnetic field db Primary Hall Coupling Factor G T A = 5 C.5 G/A Secondary Hall Coupling Factor G T A = 5 C.5 G/A Hall Plate Sensitivity Matching Sens MATCH T A = 5 C ± % Rise Time t r I P = I P (max), T A = 5 C, C L = nf μs Propagation Delay t pd I P = I P (max), T A = 5 C, C L = nf μs Response Time t RESPONSE I P = I P (max), T A = 5 C, C L = nf μs Internal Bandwidth BW Small signal db, C L = nf khz Noise Density I ND Input-referenced noise density; T A = 5 C, C L = nf Noise I N Input-referenced noise; C F =.7 nf, C L = nf, BW = 8 khz, T A = 5 C 5 µa RMS / Hz 6 ma RMS Nonlinearity E LIN Through full range of I P % Sensitivity Ratiometry Coefficient Zero-Current Output Ratiometry Coefficient SENS_RAT_ COEF QVO_RAT_ COEF V CC =.5 to 5.5 V, T A = 5 C. V CC =.5 to 5.5 V, T A = 5 C Saturation Voltage [] V OH R L =.7 kω, T A = 5 C V CC.5 V V OL R L =.7 kω, T A = 5 C.5 V Output reaches 9% of steady-state Power-On Time t PO level, T A = 5 C, I P = I PR (max) applied 8 μs Shorted Output to Ground Current I SC(GND) T A = 5 C. ma Shorted Output to V CC Current I SC(VCC) T A = 5 C 5 ma [] Device may be operated at higher primary current levels, I P, ambient temperatures, T A, and internal leadframe temperatures, provided the Maximum Junction Temperature, T J (max), is not exceeded. [] R F(INT) forms an RC circuit via the FILTER pin. [] The sensor IC will continue to respond to current beyond the range of I P until the high or low saturation voltage; however, the nonlinearity in this region will be worse than through the rest of the measurement range. Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com 5
xlmatr-ab PERFORMANCE CHARACTERISTICS: T A Range L, valid at T A = C to 5 C, V CC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [] Max. Units NOMINAL PERFORMANCE Current Sensing Range I PR A Sensitivity Sens I PR(min) < I P < I PR(max) mv/a Zero Current Output Voltage V IOUT(Q) Bidirectional; I P = A ACCURACY PERFORMANCE V CC.5 V Total Output Error [] E TOT I P = I PR(max), T A = 5 C to 5 C.5 ±.8.5 % I P = I PR(max), T A = C to 5 C 6 ±.7 6 % TOTAL OUTPUT ERROR COMPONENTS [] : E TOT = E SENS + V OE /(Sens I P ) Sensitivity Error E SENS T A = 5 C to 5 C, measured at I P = I PR(max) ±.7 % T A = C to 5 C, measured at I P = I PR(max) 5.5 ±.6 5.5 % Offset Voltage V OE I P = A, T A = 5 C to 5 C 5 ±7 5 mv I P = A, T A = C to 5 C ±5 mv LIFETIME DRIFT CHARACTERISTICS [] Sensitivity Error Including Total Output Error Including Offset Error Including Lifetime Drift E sens_drift T A = 5 C to 5 C ± % T A = C to 5 C 5.5 ± 5.5 % E tot_drift T A = 5 C to 5 C.5 ±.5 % T A = C to 5 C 6 ± 6 % E Off_Drift T A = 5 C to 5 C mv T A = C to 5 C ± mv [] Typical values with +/- are sigma values. [] Percentage of I P, with I P = I PR (max). [] 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, sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [] Based on characterization data obtained during AEC-Q stress testing. Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com 6
xlmatr-ab PERFORMANCE CHARACTERISTICS: T A Range L, valid at T A = C to 5 C, V CC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [] Max. Units NOMINAL PERFORMANCE Current Sensing Range I PR A Sensitivity Sens I PR(min) < I P < I PR(max) 66 mv/a Zero Current Output Voltage V IOUT(Q) Bidirectional; I P = A ACCURACY PERFORMANCE V CC.5 V Total Output Error [] E TOT I P = I PR(max), T A = 5 C to 5 C.5 ±.8.5 % I P = I PR(max), T A = C to 5 C 6 ±.7 6 % TOTAL OUTPUT ERROR COMPONENTS [] : E TOT = E SENS + V OE /(Sens I P ) Sensitivity Error E SENS T A = 5 C to 5 C, measured at I P = I PR(max) ±.7 % T A = C to 5 C, measured at I P = I PR(max) 5.5 ±.6 5.5 % Offset Voltage V OE I P = A, T A = 5 C to 5 C 5 ±7 5 mv I P = A, T A = C to 5 C ±5 mv LIFETIME DRIFT CHARACTERISTICS [] Sensitivity Error Including Total Output Error Including Offset Error Including Lifetime Drift E sens_drift T A = 5 C to 5 C ± % T A = C to 5 C 5.5 ± 5.5 % E tot_drift T A = 5 C to 5 C.5 ±.5 % T A = C to 5 C 6 ± 6 % E Off_Drift T A = 5 C to 5 C mv T A = C to 5 C ± mv [] Typical values with +/- are sigma values. [] Percentage of I P, with I P = I PR (max). [] 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, sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [] Based on characterization data obtained during AEC-Q stress testing. Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com 7
xlmatr-au PERFORMANCE CHARACTERISTICS: T A Range L, valid at T A = C to 5 C, V CC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [] Max. Units NOMINAL PERFORMANCE Current Sensing Range I PR A Sensitivity Sens I PR(min) < I P < I PR(max) mv/a Zero Current Output Voltage V IOUT(Q) Unidirectional; I P = A ACCURACY PERFORMANCE V CC. V Total Output Error [] E TOT I P = I PR(max), T A = 5 C to 5 C.5 ±.7.5 % I P = I PR(max), T A = C to 5 C 6 ±.5 6 % TOTAL OUTPUT ERROR COMPONENTS [] : E TOT = E SENS + V OE /(Sens I P ) Sensitivity Error E SENS T A = 5 C to 5 C, measured at I P = I PR(max) ±.7 % T A = C to 5 C, measured at I P = I PR(max) 5.5 ±.5 5.5 % Offset Voltage V OE I P = A, T A = 5 C to 5 C 5 ±7 5 mv I P = A, T A = C to 5 C ± mv LIFETIME DRIFT CHARACTERISTICS [] Sensitivity Error Including Total Output Error Including Offset Error Including Lifetime Drift E sens_drift T A = 5 C to 5 C ± % T A = C to 5 C 5.5 ± 5.5 % E tot_drift T A = 5 C to 5 C.5 ±.5 % T A = C to 5 C 6 ± 6 % E Off_Drift T A = 5 C to 5 C mv T A = C to 5 C ± mv [] Typical values with +/- are sigma values. [] Percentage of I P, with I P = I PR (max). [] 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, sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [] Based on characterization data obtained during AEC-Q stress testing. Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com 8
xlmatr-5ab PERFORMANCE CHARACTERISTICS: T A Range L, valid at T A = C to 5 C, V CC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [] Max. Units NOMINAL PERFORMANCE Current Sensing Range I PR 5 5 A Sensitivity Sens I PR(min) < I P < I PR(max) mv/a Zero Current Output Voltage V IOUT(Q) Bidirectional; I P = A ACCURACY PERFORMANCE V CC.5 V Total Output Error [] E TOT I P = I PR(max), T A = 5 C to 5 C.5 ±.5 % I P = I PR(max), T A = C to 5 C 6 ± 6 % TOTAL OUTPUT ERROR COMPONENTS [] : E TOT = E SENS + V OE /(Sens I P ) Sensitivity Error E SENS T A = 5 C to 5 C, measured at I P = I PR(max) ± % T A = C to 5 C, measured at I P = I PR(max) 5.5 ±.8 5.5 % Offset Voltage V OE I P = A, T A = 5 C to 5 C 5 ±5 5 mv I P = A, T A = C to 5 C ± mv LIFETIME DRIFT CHARACTERISTICS [] Sensitivity Error Including Total Output Error Including Offset Error Including Lifetime Drift E sens_drift T A = 5 C to 5 C ± % T A = C to 5 C 5.5 ± 5.5 % E tot_drift T A = 5 C to 5 C.5 ±.5 % T A = C to 5 C 6 ± 6 % E Off_Drift T A = 5 C to 5 C mv T A = C to 5 C ± mv [] Typical values with +/- are sigma values. [] Percentage of I P, with I P = I PR (max). [] 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, sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [] Based on characterization data obtained during AEC-Q stress testing. Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com 9
xlmatr-5au PERFORMANCE CHARACTERISTICS: T A Range L, valid at T A = C to 5 C, V CC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [] Max. Units NOMINAL PERFORMANCE Current Sensing Range I PR 5 A Sensitivity Sens I PR(min) < I P < I PR(max) 8 mv/a Zero Current Output Voltage V IOUT(Q) Unidirectional; I P = A ACCURACY PERFORMANCE V CC. V Total Output Error [] E TOT I P = I PR(max), T A = 5 C to 5 C.5 ±.5 % I P = I PR(max), T A = C to 5 C 6 ± 6 % TOTAL OUTPUT ERROR COMPONENTS [] : E TOT = E SENS + V OE /(Sens I P ) Sensitivity Error E SENS T A = 5 C to 5 C, measured at I P = I PR(max) ± % T A = C to 5 C, measured at I P = I PR(max) 5.5 ±.8 5.5 % Offset Voltage V OE I P = A, T A = 5 C to 5 C 5 ±5 5 mv I P = A, T A = C to 5 C ± mv LIFETIME DRIFT CHARACTERISTICS [] Sensitivity Error Including Total Output Error Including Offset Error Including Lifetime Drift E sens_drift T A = 5 C to 5 C ± % T A = C to 5 C 5.5 ± 5.5 % E tot_drift T A = 5 C to 5 C.5 ±.5 % T A = C to 5 C 6 ± 6 % E Off_Drift T A = 5 C to 5 C mv T A = C to 5 C ± mv [] Typical values with +/- are sigma values. [] Percentage of I P, with I P = I PR (max). [] 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, sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [] Based on characterization data obtained during AEC-Q stress testing. Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com
xlmatr-65ab PERFORMANCE CHARACTERISTICS: T A Range L, valid at T A = C to 5 C, V CC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [] Max. Units NOMINAL PERFORMANCE Current Sensing Range I PR 65 65 A Sensitivity Sens I PR(min) < I P < I PR(max).75 mv/a Zero Current Output Voltage V IOUT(Q) Bidirectional; I P = A ACCURACY PERFORMANCE V CC.5 V Total Output Error [] E TOT I P = I PR(max), T A = 5 C to 5 C.5 ±.5 % I P = I PR(max), T A = C to 5 C 6 ± 6 % TOTAL OUTPUT ERROR COMPONENTS [] : E TOT = E SENS + V OE /(Sens I P ) Sensitivity Error E SENS T A = 5 C to 5 C, measured at I P = I PR(max) ± % T A = C to 5 C, measured at I P = I PR(max) 5.5 ±.8 5.5 % Offset Voltage V OE I P = A, T A = 5 C to 5 C 5 ±5 5 mv I P = A, T A = C to 5 C ± mv LIFETIME DRIFT CHARACTERISTICS [] Sensitivity Error Including Total Output Error Including Offset Error Including Lifetime Drift E sens_drift T A = 5 C to 5 C ± % T A = C to 5 C 5.5 ± 5.5 % E tot_drift T A = 5 C to 5 C.5 ±.5 % T A = C to 5 C 6 ± 6 % E Off_Drift T A = 5 C to 5 C mv T A = C to 5 C ± mv [] Typical values with +/- are sigma values. [] Percentage of I P, with I P = I PR (max). [] 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, sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [] Based on characterization data obtained during AEC-Q stress testing. Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com
CHARACTERISTIC PERFORMANCE xlmatr-ab V IOUT(Q) (mv) Zero Current Output Voltage vs. Temperature 55 5 55 5 55 5 95 9 85 8 75 Offset Voltage (mv) Offset Voltage vs. Temperature 5 5 5-5 - -5 - -5 Sensitivity (mv/a) Sensitivity vs. Temperature 5 99 98 97 96 95 Sensitivity Error (%) Sensitivity Error vs. Temperature 5 - - - - -5 Linearity Error (%) Linearity Error vs. Temperature.5..5. -.5 -. -.5 Total Error (%) Total Error vs. Temperature 5 - - - - -5 + Sigma Average - Sigma Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com
CHARACTERISTIC PERFORMANCE xlmatr-ab 5 55 5 Zero Current Output Voltage vs. Temperature 5 Offset Voltage vs. Temperature V IOUT(Q) (mv) 55 5 95 9 85 8 Offset Voltage (mv) 5-5 - -5 - Sensitivity (mv/a) Sensitivity vs. Temperature 7 69 68 67 66 65 6 6 6 Sensitivity Error (%) Sensitivity Error vs. Temperature - - - -..5 Linearity Error vs. Temperature Total Error vs. Temperature Linearity Error (%). -.5 -. Total Error (%) - - - - + Sigma Average - Sigma Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com
CHARACTERISTIC PERFORMANCE xlmatr-au V IOUT(Q) (mv) Zero Current Output Voltage vs. Temperature 55 5 55 5 55 5 95 9 85 8 75 Offset Voltage (mv) Offset Voltage vs. Temperature 5 5-5 - -5-6 Sensitivity vs. Temperature Sensitivity Error vs. Temperature Sensitivity (mv/a) 5 9 8 Sensitivity Error (%) - - -. Linearity Error vs. Temperature Total Error vs. Temperature Linearity Error (%).5. -.5 Total Error (%) - - -. - + Sigma Average - Sigma Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com
CHARACTERISTIC PERFORMANCE xlmatr-5ab Zero Current Output Voltage vs. Temperature Offset Voltage vs. Temperature 5 5 V IOUT(Q) (mv) 55 5 55 5 95 9 85 Offset Voltage (mv) 5-5 - 8-5 Sensitivity vs. Temperature Sensitivity Error vs. Temperature Sensitivity (mv/a) Sensitivity Error (%) - - - 9 - Linearity Error vs. Temperature Total Error vs. Temperature..5 Linearity Error (%). Total Error (%) - -.5 - - -. - + Sigma Average - Sigma Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com 5
CHARACTERISTIC PERFORMANCE xlmatr-5au 5 55 5 Zero Current Output Voltage vs. Temperature 5 Offset Voltage vs. Temperature V IOUT(Q) (mv) 55 5 95 9 85 8 Offset Voltage (mv) 5-5 - -5 - Sensitivity (mv/a) Sensitivity vs. Temperature 8 8 8 8 8 79 78 77 76 Sensitivity Error (%) Sensitivity Error vs. Temperature - - - -..5 Linearity Error vs. Temperature Total Error vs. Temperature Linearity Error (%). -.5 -. Total Error (%) - - - - + Sigma Average - Sigma Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com 6
CHARACTERISTIC PERFORMANCE xlmatr-65ab Zero Current Output Voltage vs. Temperature Offset Voltage vs. Temperature 5 5 55 V IOUT(Q) (mv) 5 55 5 95 9 85 Offset Voltage (mv) 5-5 - 8-5 Sensitivity vs. Temperature Sensitivity Error vs. Temperature Sensitivity (mv/a) Sensitivity Error (%) - - - 9 - Nonlinearity vs. Temperature Total Error vs. Temperature Nonlinearity (%).5 -.5 Total Error (%) - - - - - + Sigma Average - Sigma Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com 7
DEFINITIONS OF ACCURACY CHARACTERISTICS Sensitivity (Sens) The change in sensor IC output in response to a A change through the primary conductor. The sensitivity is the product of the magnetic coupling factor (G/A) ( G =. 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 (E LIN ) 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: { V [ IOUT (I PR (max)) V IOUT(Q) E (%) LIN = V IOUT (I PR (max)/) V IOUT(Q) where V IOUT (I PR(max) ) is the output of the sensor IC with the maximum measurement current flowing through it and V IOUT (I PR(max) /) is the output of the sensor IC with half of the maximum measurement current flowing through it. Zero Current Output Voltage (V IOUT(Q) ) The output of the sensor when the primary current is zero. For a unipolar supply voltage, it nominally remains at.5 V CC for a bidirectional device and. V CC for a unidirectional device. For example, in the case of a bidirectional output device, V CC = 5. V translates into V IOUT(Q) =.5 V. Variation in V IOUT(Q) can be attributed to the resolution of the Allegro linear IC quiescent voltage trim and thermal drift. Offset Voltage (V OE ) The deviation of the device output from its ideal quiescent value of.5 V CC (bidirectional) or. V CC (unidirectional) due to nonmagnetic causes. To convert this voltage to amperes, divide by the device sensitivity, Sens. Total Output Error (E TOT ) The difference between the current measurement from the sensor IC and the actual current (I P ), 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: E TOT (I P ) = V IOUT_ideal (I P ) V IOUT (I P ) Sens ideal (I P ) I P (%) The Total Output Error incorporates all sources of error and is a function of I P. At relatively high currents, E TOT will be mostly due to { [ sensitivity error, and at relatively low currents, E TOT will be mostly due to Offset Voltage (V OE ). In fact, at I P =, E TOT approaches infinity due to the offset. This is illustrated in Figure and Figure. Figure shows a distribution of output voltages versus I P at 5 C and across temperature. Figure shows the corresponding E TOT versus I P. I P (A) Figure : Output Voltage versus Sensed Current I P I PR (min) Accuracy Across Temperature Accuracy at 5 C Only Accuracy at 5 C Only Accuracy Across Temperature Increasing V IOUT (V) A E TOT Decreasing V IOUT (V) Accuracy Across Temperature Accuracy at 5 C Only Ideal V IOUT +E TOT V IOUT(Q) Full Scale I P I PR (max) Across Temperature 5 C Only +I P (A) Figure : Total Output Error versus Sensed Current +I P Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com 8
APPLICATION INFORMATION Estimating Total Error versus Sensed Current The Performance Characteristics tables give distribution (± sigma) values for Total Error at I PR(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 ± sigma value for Total Error (E TOT ) as a function of the sensed current (I P ) is estimated as: E TOT(I) P = E + SENS ( ) V OE Sens I P Here, E SENS and V OE are the ± 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: V OEAVG E TOT (I) P = E SENS + AVG AVG Sens I P The resulting total error will be a sum of E TOT and E TOT_AVG. Using these equations and the sigma distributions for Sensitivity Error and Offset Voltage, the Total Error versus sensed current (I P ) is shown here for the ACS7LMATR-AB. As expected, as one goes towards zero current, the error in percent goes towards infinity due to division by zero. Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com 9
DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS Power-On Time (t PO ) 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 (t PO ) is defined as the time it takes for the output voltage to settle within ±% of its steady-state value under an applied magnetic field, after the power supply has reached its minimum specified operating voltage (V CC (min)) as shown in the chart at right (refer to Figure ). Rise Time (t r ) The time interval between: a) when the sensor IC reaches % of its full-scale value; and b) when it reaches 9% of its fullscale value (refer to Figure ). The rise time to a step response is used to derive the bandwidth of the current sensor IC, in which ƒ( db) =.5 / t r. Both t r and t RESPONSE are detrimentally affected by eddy current losses observed in the conductive IC ground plane. Propagation Delay (t pd ) The propagation delay is measured as the time interval between: a) when the primary current signal reaches % of its final value, and b) when the device reaches % of its output corresponding to the applied current (refer to Figure ). Response Time (t RESPONSE ) The time interval between: a) when the primary current signal reaches 9% of its final value, and b) when the device reaches 9% of its output corresponding to the applied current (refer to Figure 5). V V CC (typ) 9% V IOUT V CC (min) (%) 9 (%) 9 V CC t t t PO V IOUT t = time at which power supply reaches minimum specified operating voltage t = time at which output voltage settles within ±% of its steady state value under an applied magnetic field Figure : Power-On Time Primary Current V IOUT Rise Time, tr Propagation Delay, tpd Figure : Rise Time and Propagation Delay Primary Current V IOUT t t Response Time, tresponse t Figure 5: Response Time Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com
NOT TO SCALE All dimensions in millimeters..65 5.75 9.5.7 Package Outline.5 Slot in PCB to maintain >8 mm creepage once part is on PCB 7.5.56.7 7.7 Current In Current Out.5 Perimeter holes for stitching to the other, matching current trace design, layers of the PCB for enhanced thermal capability. Figure 6: High-Isolation PCB Layout Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com
PACKAGE OUTLINE DRAWING For Reference Only Not for Tooling Use (Reference MS-AA) NOTTO SCALE Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown 6. ±. 8.. 7.5 ±.. ±. A.7.. REF Branded Face.5 BSC 6X. C.65 MAX SEATING PLANE C SEATING PLANE GAUGE PLANE.5..7 BSC...65.7.5 6 NNNNNNN LLLLLLLL 9.5 B Standard Branding Reference View N = Device part number L = Assembly Lot Number, first eight characters A Terminal # mark area C PCB Layout Reference View B C Branding scale and appearance at supplier discretion Reference land pattern layout (reference IPC75 SOIC7P6X75-8M); all pads a minimum of. mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances Figure 7: Package MA, 6-Pin SOICW Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com
Revision History Number Date Description October 6, 7 Initial release October, 7 Updated Characteristics (pages 6-) November 7, 7 Added Sensitivity Ratiometry Coefficient and Zero-Current Output Ratiometry Coefficient to Electrical Characteristics table (page 5). January 8, 8 Corrected certification status (page and ) January, 8 Added Dielectric Surge Strength Test Voltage to Isolation Characteristics table (page ). 5 January, 8 Added Common Mode Field Rejection Ratio characteristic (page 5). 6 March 9, 8 Added -65AB part option. Copyright 8, 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, assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. For the latest version of this document, visit our website: www.allegromicro.com Worcester, Massachusetts 65-6 U.S.A..58.85.5; www.allegromicro.com