ACS758KCB-150B-PSS-T

ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Features and Benefits ▪ Industry-leading noise performance through proprietary amplifier and filter design techniques ▪ Integrated shield greatly reduces capacitive coupling from current conductor to die due to high dV/dt signals, and prevents offset drift in high-side, high voltage applications ▪ Total output error improvement through gain and offset trim over temperature ▪ Small package size, with easy mounting capability ▪ Monolithic Hall IC for high reliability ▪ Ultra-low power loss: 100 μΩ internal conductor resistance ▪ Galvanic isolation allows use in economical, high-side current sensing in high voltage systems ▪ 3.0 to 5.5 V, single supply operation ▪ 120 kHz typical bandwidth ▪ 3 μs output rise time in response to step input current ▪ Output voltage proportional to AC or DC currents ▪ Factory-trimmed for accuracy ▪ Extremely stable output offset voltage ▪ Nearly zero magnetic hysteresis Description The Allegro® ACS758 family of current sensor ICs provides economical and precise solutions for AC or DC current sensing. Typical applications include motor control, load detection and management, power supply and DC-to-DC converter control, inverter control, and overcurrent fault detection. The device consists of a precision, low-offset linear Hall circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field which the Hall IC converts into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional output voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the factory. High level immunity to current conductor dV/dt and stray electric fields, offered by Allegro proprietary integrated shield technology, guarantees low output voltage ripple and low offset drift in high-side, high voltage applications. The output of the device has a positive slope (>VCC / 2) when an increasing current flows through the primary copper conduction path (from terminal 4 to terminal 5), which is the path used for current sampling. The internal resistance of this conductive path is 100 μΩ typical, providing low power loss. The thickness of the copper conductor allows survival of the device at high overcurrent conditions. The terminals of the Package: 5-pin package PSS Leadform PFF Leadform Continued on the next page… Additional leadforms available for qualifying volumes Typical Application +3.3 or 5 V 4 VCC IP+ ACS758 GND 5 IP– 1 CBYP 0.1 μF CF VIOUT 3 RF VOUT IP 2 Application 1. The ACS758 outputs an analog signal, VOUT , that varies linearly with the uni- or bi-directional AC or DC primary sampled current, IP , within the range specified. CF is for optimal noise management, with values that depend on the application. ACS758-DS, Rev. 1 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Description (continued) conductive path are electrically isolated from the signal leads (pins 1 through 3). This allows the ACS758 family of sensor ICs to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. The device is fully calibrated prior to shipment from the factory. The ACS758 family is lead (Pb) free. All leads are plated with 100% matte tin, and there is no Pb inside the package. The heavy gauge leadframe is made of oxygen-free copper. Selection Guide Package Part Number1 ACS758LCB-050B-PFF-T ACS758LCB-100B-PFF-T ACS758KCB-150B-PFF-T ACS758KCB-150B-PSS-T ACS758ECB-200B-PFF-T ACS758ECB-200B-PSS-T 1Additional 2Contact Allegro Terminals Formed Formed Formed Straight Formed Straight Signal Pins Formed Formed Formed Straight Formed Straight Primary Sampled Current , IP (A) ±50 ±100 ±150 ±200 Sensitivity Sens (Typ.) (mV/A) 40 20 13.3 10 TOP (°C) –40 to 150 –40 to 125 –40 to 85 Packing2 170 per bulk bag leadform options available for qualified volumes for additional packing options. Absolute Maximum Ratings Characteristic Forward Supply Voltage Reverse Supply Voltage Working Voltage for Reinforced Isolation Forward Output Voltage Reverse Output Voltage Output Source Current Output Sink Current Nominal Operating Ambient Temperature Maximum Junction Storage Temperature Symbol VCC VRCC VWORKING VIOUT VRIOUT IOUT(Source) IOUT(Sink) TOP TJ(max) Tstg VIOUT to GND VCC to VIOUT Range E Range K Range L Voltage applied between pins 1-3 and 4-5; tested at 3000 VAC for 1 minute according to UL standard 60950-1 Notes Rating 8 –0.5 353 28 –0.5 3 1 –40 to 85 –40 to 125 –40 to 150 165 –65 to 165 Units V V VAC V V mA mA ºC ºC ºC ºC ºC Typical Overcurrent Capabilities1,2 Characteristic Overcurrent 1Test Symbol IPOC Notes TA = 25°C, 1s duration, 1% duty cycle TA = 85°C, 1s duration, 1% duty cycle TA = 150°C, 1s duration, 1% duty cycle Rating 1200 900 600 Units A A A was done with Allegro evaluation board. The maximum allowed current is limited by TJ(max) only. 2For more overcurrent profiles, please see FAQ on the Allegro website, www.allegromicro.com. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Functional Block Diagram +3.3 to 5 V IP+ VCC To all subcircuits Dynamic Offset Cancellation Amp Filter Out VIOUT 0.1 μF Gain Gain Temperature Coefficient Trim Control Offset Offset Temperature Coefficient IP– GND Pin-out Diagram IP+ 4 3 2 1 VIOUT GND VCC IP– 5 Terminal List Table Number 1 2 3 4 5 Name VCC GND VIOUT IP+ IP– Device power supply terminal Signal ground terminal Analog output signal Terminal for current being sampled Terminal for current being sampled Description Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor COMMON OPERATING CHARACTERISTICS1 valid at TOP = –40°C to 150°C and VCC = 5 V, unless otherwise specified Characteristic Supply Voltage Supply Current Power-On Delay Rise Time2 Propagation Delay Response Time Internal Bandwidth3 Output Load Resistance Output Load Capacitance Primary Conductor Resistance Symmetry2 Quiescent Output Ratiometry2 1Device 2See Symbol VCC ICC tPOD tr Output open TA = 25°C Test Conditions Min. 3 – – – – – – 4.7 – – 99 – – Typ. 5.0 10 10 3 1 4 120 – – 100 100 VCC/2 100 Max. 5.5 13.5 – – – – – – 10 – 101 – – Units V mA μs μs μs μs kHz kΩ nF μΩ % V % Time2 tPROP tRESPONSE BWi RLOAD(MIN) CLOAD(MAX) RPRIMARY ESYM VIOUT(Q) VRAT IP step = 60% of IP+, 10% to 90% rise time, TA = 25°C, COUT = 0.47 nF TA = 25°C, COUT = 0.47 nF Measured as sum of tPROP and tr –3 dB; TA = 25°C, COUT = 0.47 nF VIOUT to GND VIOUT to GND TA = 25°C Over half-scale of Ip IP = 0 A, TA = 25°C VCC = 4.5 to 5.5 V Voltage4 is factory-trimmed at 5 V, for optimal accuracy. Characteristic Definitions section of this datasheet. 3Calculated using the formula BW = 0.35 / t . i r 4V IOUT(Q) may drift over the lifetime of the device by as much as ±25 mV. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor X050 PERFORMANCE CHARACTERISTICS1: Characteristic Primary Sampled Current Sensitivity Noise2 Nonlinearity Electrical Offset Voltage3 Magnetic Offset Error Total Output Error4 1See TOP = –40°C to 150°C, VCC = 5 V, unless otherwise specified Test Conditions Min. –50 – – – – –1 – – – – – – Typ. – 40 39.4 41 10 – ±5 ±15 ±35 100 –1.2 2 Max. 50 – – – – 1 – – – – – – Units A mV/A mV/A mV/A mV % mV mV mV mA % % Symbol IP SensTA Full scale of IP applied for 5 ms, TA = 25°C Sens(TOP)HT Full scale of IP applied for 5 ms, TOP = 25°C to 150°C Sens(TOP)LT Full scale of IP applied for 5 ms,TOP = –40°C to 25°C VNOISE ELIN VOE(TA) TA= 25°C, 10 nF on VIOUT pin to GND Up to full scale of IP , IP applied for 5 ms IP = 0 A, TA = 25°C VOE(TOP)HT IP = 0 A, TOP = 25°C to 150°C VOE(TOP)LT IP = 0 A, TOP = –40°C to 25°C IERROM ETOT(HT) ETOT(LT) IP = 0 A, TA = 25°C, after excursion of 50 A Over full scale of IP , IP applied for 5 ms, TOP = 25°C to 150°C Over full scale of IP , IP applied for 5 ms, TOP = –40°C to 25°C Characteristic Performance Data page for parameter distributions over temperature range. 2±3 sigma noise voltage. 3V OE(TOP) drift is referred to ideal VIOUT(Q) = 2.5 V. 4Percentage of I . Output filtered. P X100 PERFORMANCE CHARACTERISTICS1: Characteristic Primary Sampled Current Sensitivity Noise2 Nonlinearity Electrical Offset Voltage3 Magnetic Offset Error Total Output Error4 1See TOP = –40°C to 150°C, VCC = 5 V, unless otherwise specified Test Conditions Min. –100 – – – – – 1.25 – – – – – – Typ. – 20 19.75 20.5 6 – ±5 ±20 ±20 150 –1.3 2.4 Max. 100 – – – – 1.25 – – – – – – Units A mV/A mV/A mV/A mV % mV mV mV mA % % Symbol IP SensTA Full scale of IP applied for 5 ms, TA = 25°C Sens(TOP)HT Full scale of IP applied for 5 ms, TOP = 25°C to 150°C Sens(TOP)LT Full scale of IP applied for 5 ms, TOP = –40°C to 25°C VNOISE ELIN VOE(TA) TA= 25°C, 10 nF on VIOUT pin to GND Up to full scale of IP , IP applied for 5 ms IP = 0 A, TA = 25°C VOE(TOP)HT IP = 0 A, TOP = 25°C to 150°C VOE(TOP)LT IP = 0 A, TOP = –40°C to 25°C IERROM ETOT(HT) ETOT(LT) IP = 0 A, TA = 25°C, after excursion of 100 A Over full scale of IP , IP applied for 5 ms, TOP = 25°C to 150°C Over full scale of IP , IP applied for 5 ms, TOP = –40°C to 25°C Characteristic Performance Data page for parameter distributions over temperature range. 2±3 sigma noise voltage. 3V OE(TOP) drift is referred to ideal VIOUT(Q) = 2.5 V. 4Percentage of I . Output filtered. P Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor X150 PERFORMANCE CHARACTERISTICS1: Characteristic Primary Sampled Current Sensitivity Noise2 Nonlinearity Electrical Offset Voltage3 Magnetic Offset Error Total Output Error4 1See TOP = –40°C to 125°C, VCC = 5 V, unless otherwise specified Test Conditions Min. –150 – – – – –1 – – – – – – Typ. – 13.3 13.1 13.5 4 – ±5 ±14 ±24 205 –1.8 1.6 Max. 150 – – – – 1 – – – – – – Units A mV/A mV/A mV/A mV % mV mV mV mA % % Symbol IP SensTA Full scale of IP applied for 5 ms, TA = 25°C Sens(TOP)HT Full scale of IP applied for 5 ms, TOP = 25°C to 125°C Sens(TOP)LT Full scale of IP applied for 5 ms, TOP = –40°C to 25°C VNOISE ELIN VOE(TA) TA= 25°C, 10 nF on VIOUT pin to GND Up to full scale of IP , IP applied for 5 ms IP = 0 A, TA = 25°C VOE(TOP)HT IP = 0 A, TOP = 25°C to 125°C VOE(TOP)LT IP = 0 A, TOP = –40°C to 25°C IERROM ETOT(HT) ETOT(LT) IP = 0 A, TA = 25°C, after excursion of 150 A Over full scale of IP , IP applied for 5 ms, TOP = 25°C to 125°C Over full scale of IP , IP applied for 5 ms, TOP = –40°C to 25°C Characteristic Performance Data page for parameter distributions over temperature range. 2±3 sigma noise voltage. 3V OE(TOP) drift is referred to ideal VIOUT(Q) = 2.5 V. 4Percentage of I . Output filtered. P X200 PERFORMANCE CHARACTERISTICS1: Characteristic Primary Sampled Current Sensitivity Noise2 Nonlinearity Electrical Offset Voltage3 Magnetic Offset Error Total Output Error4 1See TOP = –40°C to 85°C, VCC = 5 V, unless otherwise specified Test Conditions Min. –200 – – – – –1 – – – – – – Typ. – 10 9.88 10.13 3 – ±5 ±15 ±25 230 –1.2 1.2 Max. 200 – – – – 1 – – – – – – Units A mV/A mV/A mV/A mV % mV mV mV mA % % Symbol IP SensTA Full scale of IP applied for 5 ms, TA = 25°C Sens(TOP)HT Full scale of IP applied for 5 ms, TOP = 25°C to 85°C Sens(TOP)LT Full scale of IP applied for 5 ms, TOP = –40°C to 25°C VNOISE ELIN VOE(TA) TA= 25°C, 10 nF on VIOUT pin to GND Up to full scale of IP , IP applied for 5 ms IP = 0 A, TA = 25°C VOE(TOP)HT IP = 0 A, TOP = 25°C to 85°C VOE(TOP)LT IP = 0 A, TOP = –40°C to 25°C IERROM ETOT(HT) ETOT(LT) IP = 0 A, TA = 25°C, after excursion of 200 A Over full scale of IP , IP applied for 5 ms, TOP = 25°C to 85°C Over full scale of IP , IP applied for 5 ms, TOP = –40°C to 25°C Characteristic Performance Data page for parameter distributions over temperature range. 2±3 sigma noise voltage. 3V OE(TOP) drift is referred to ideal VIOUT(Q) = 2.5 V . 4Percentage of I . Output filtered. P Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 6 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Characteristic Performance Data Data taken using the ACS758LCB-50B Accuracy Data Electrical Offset Voltage versus Ambient Temperature 30 20 42.0 42.5 Sensitivity versus Ambient Temperature Sens (mV/A) -25 0 25 50 TA (°C) 75 100 125 150 10 41.0 40.5 40.0 39.5 39.0 38.5 –50 VOE (mV) 0 -10 -20 -30 -40 -50 –50 -25 0 25 50 TA (°C) 75 100 125 150 Nonlinearity versus Ambient Temperature 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 –50 -25 0 25 50 TA (°C) 75 100 125 150 100.40 100.35 100.30 100.25 100.20 100.15 100.10 100.05 100.00 99.95 –50 Symmetry versus Ambient Temperature ESYM (%) ELIN (%) -25 0 25 50 TA (°C) 75 100 125 150 Magnetic Offset Error versus Ambient Temperature 140 120 100 6 5 4 3 2 1 0 -1 -2 -3 -25 0 25 50 TA (°C) 75 100 125 150 -4 –50 Total Output Error versus Ambient Temperature IERROM (mA) 60 40 20 0 –50 ETOT (%) 80 -25 0 25 50 TA (°C) 75 100 125 150 Typical Maximum Limit Mean Typical Minimum Limit Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 7 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Characteristic Performance Data Data taken using the ACS758LCB-100B Accuracy Data Electrical Offset Voltage versus Ambient Temperature 25 20 15 10 21.2 21.0 20.8 20.6 20.4 20.2 20.0 19.8 19.6 19.4 -25 0 25 50 TA (°C) 75 100 125 150 19.2 –50 -25 0 25 50 TA (°C) 75 100 125 150 Sensitivity versus Ambient Temperature VOE (mV) 5 0 -5 -10 -15 -20 -25 –50 Nonlinearity versus Ambient Temperature 0.40 0.35 0.30 100.6 100.5 100.4 100.3 100.2 100.1 100.0 99.9 99.8 -25 0 25 50 TA (°C) 75 100 125 150 99.7 –50 Sens (mV/A) Symmetry versus Ambient Temperature ELIN (%) 0.25 0.20 0.15 0.10 0.05 0 –50 ESYM (%) -25 0 25 50 TA (°C) 75 100 125 150 Magnetic Offset Error versus Ambient Temperature 200 190 180 170 150 130 120 110 100 –50 -25 0 25 50 TA (°C) 75 100 125 150 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 –50 Total Output Error versus Ambient Temperature IERROM (mA) ETOT (%) 160 -25 0 25 50 TA (°C) 75 100 125 150 Typical Maximum Limit Mean Typical Minimum Limit Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 8 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Characteristic Performance Data Data taken using the ACS758KCB-150B Accuracy Data Electrical Offset Voltage versus Ambient Temperature 20 15 10 5 14.0 13.8 Sensitivity versus Ambient Temperature Sens (mV/A) –40 –20 0 20 40 TA (°C) 60 80 100 120 140 13.6 13.4 13.2 13.0 12.8 12.6 –60 VOE (mV) 0 -5 -10 -15 -20 -25 -30 –60 –40 –20 0 20 40 TA (°C) 60 80 100 120 140 Nonlinearity versus Ambient Temperature 0.30 0.25 100.7 100.6 100.5 100.4 100.3 100.2 100.1 100.0 99.9 –40 –20 0 20 40 TA (°C) 60 80 100 120 140 99.8 –60 Symmetry versus Ambient Temperature 0.15 0.10 0.05 0 –60 ESYM (%) ELIN (%) 02.0 –40 –20 0 20 40 TA (°C) 60 80 100 120 140 Magnetic Offset Error versus Ambient Temperature 300 250 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 –60 Total Output Error versus Ambient Temperature IERROM (mA) 200 150 100 50 0 –60 –40 –20 0 20 40 TA (°C) 60 80 100 120 140 ETOT (%) –40 –20 0 20 40 TA (°C) 60 80 100 120 140 Typical Maximum Limit Mean Typical Minimum Limit Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 9 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Characteristic Performance Data Data taken using the ACS758ECB-200B Accuracy Data Electrical Offset Voltage versus Ambient Temperature 25 20 15 10 5 0 -5 -10 -15 -20 -25 -30 –60 10.4 10.3 10.2 10.1 10.0 9.9 9.8 9.7 9.6 –40 –20 0 20 40 TA (°C) 60 80 100 120 140 9.5 –60 –40 –20 0 20 40 TA (°C) 60 80 100 120 140 Sensitivity versus Ambient Temperature VOE (mV) Nonlinearity versus Ambient Temperature 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 –60 100.8 100.6 Sens (mV/A) Symmetry versus Ambient Temperature ESYM (%) –40 –20 0 20 40 TA (°C) 60 80 100 120 140 ELIN (%) 100.4 100.2 100.0 99.8 99.6 –60 –40 –20 0 20 40 TA (°C) 60 80 100 120 140 Magnetic Offset Error versus Ambient Temperature 350 300 250 4 3 2 1 0 -1 -2 -3 -4 -5 –40 –20 0 20 40 TA (°C) 60 80 100 120 140 -6 –60 Total Output Error versus Ambient Temperature IERROM (mA) 150 100 50 0 –60 ETOT (%) 200 –40 –20 0 20 40 TA (°C) 60 80 100 120 140 Typical Maximum Limit Mean Typical Minimum Limit Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 10 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Characteristic Performance Data Data taken using the ACS758LCB-100 Timing Data Rise Time Propagation Delay Time IP (20 A/div.) IP (20 A/div.) VIOUT (0.5 V/div.) VIOUT (0.5 V/div.) 2.988 μs 997 ns t (2 μs/div.) t (2 μs/div.) Response Time Power-on Delay VCC IP (20 A/div.) VIOUT (0.5 V/div.) 9.034 μs VIOUT (1 V/div.) (IP = 60 A DC) 3.960 μs t (2 μs/div.) t (2 μs/div.) Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 11 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Characteristic Definitions Definitions of Accuracy Characteristics Sensitivity (Sens). The change in device output in response to a 1 A change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity (G / A) 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 half-scale current of the device. Noise (VNOISE). The noise floor is derived from the thermal and shot noise observed in Hall elements. Dividing the noise (mV) by the sensitivity (mV/A) provides the smallest current that the device is able to resolve. Nonlinearity (ELIN). The degree to which the voltage output from the IC varies in direct proportion to the primary current through its half-scale amplitude. Nonlinearity in the output can be attributed to the saturation of the flux concentrator approaching the half-scale current. The following equation is used to derive the linearity: 100 1– The ratiometric change (%) in the quiescent voltage output is defined as: VIOUTQ( VIOUTQ(VCC) VIOUTQ(5V) V) = VCC 5V % and the ratiometric change (%) in sensitivity is defined as: Sens( V = Sens(VCC VCC Sens( 5V V % Quiescent output voltage (VIOUT(Q)). The output of the device when the primary current is zero. For a unipolar supply voltage, it nominally remains at VCC ⁄ 2. Thus, 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, magnetic hysteresis, and thermal drift. Electrical offset voltage (VOE). The deviation of the device output from its ideal quiescent value of VCC ⁄ 2 due to nonmagnetic causes. Magnetic offset error (IERROM). The magnetic offset is due to the residual magnetism (remnant field) of the core material. The magnetic offset error is highest when the magnetic circuit has been saturated, usually when the device has been subjected to a full-scale or high-current overload condition. The magnetic offset is largely dependent on the material used as a flux concentrator. The larger magnetic offsets are observed at the lower operating temperatures. Total Output Error (ETOT). The maximum deviation of the actual output from its ideal value, also referred to as accuracy, illustrated graphically in the output voltage versus current chart on the following page. ETOT is divided into four areas:  0 A at 25°C. Accuracy at the zero current flow at 25°C, without the effects of temperature.  0 A over Δ temperature. Accuracy at the zero current flow including temperature effects.  Half-scale current at 25°C. Accuracy at the the half-scale current at 25°C, without the effects of temperature.  Half-scale current over Δ temperature. Accuracy at the halfscale current flow including temperature effects. {[ Δ gain × % sat ( VIOUT_half-scale amperes –VIOUT(Q) ) 2 (VIOUT_quarter-scale amperes – VIOUT(Q) ) [{ where ∆ gain = the gain variation as a function of temperature changes from 25ºC, % sat = the percentage of saturation of the flux concentrator, which becomes significant as the current being sampled approaches half-scale ±IP , and VIOUT_half-scale amperes = the output voltage (V) when the sampled current approximates half-scale ±IP . Symmetry (ESYM). The degree to which the absolute voltage output from the IC varies in proportion to either a positive or negative half-scale primary current. The following equation is used to derive symmetry: 100 VIOUT_+ half-scale amperes – VIOUT(Q)  VIOUT(Q) – VIOUT_–half-scale amperes  Ratiometry. The device features a ratiometric output. This means that the quiescent voltage output, VIOUTQ, and the magnetic sensitivity, Sens, are proportional to the supply voltage, VCC. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 12 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor 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. Rise time (tr). The time interval between a) when the device 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 device, in which ƒ(–3 dB) = 0.35 / tr. Both tr and tRESPONSE are detrimentally affected by eddy current losses observed in the conductive IC ground plane. I (%) 90 Primary Current Output Voltage versus Sampled Current Total Output Error at 0 A and at Half-Scale Current Transducer Output 10 0 Rise Time, tr t Increasing VIOUT(V) Accuracy Over Temp erature Accuracy 25°C Only Propagation delay (tPROP). The time required for the device output to reflect a change in the primary current signal. Propagation delay is attributed to inductive loading within the linear IC package, as well as in the inductive loop formed by the primary conductor geometry. Propagation delay can be considered as a fixed time offset and may be compensated. I (%) 90 Primary Current Average VIOUT Accuracy Over Temp erature Accuracy 25°C Only IP(min) –IP (A) +IP (A) Half Scale IP(max) 0A Transducer Output 0 Propagation Time, tPROP t Accuracy 25°C Only Accuracy Over Temp erature Decreasing VIOUT(V) Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 13 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Chopper Stabilization Technique Chopper Stabilization is an innovative circuit technique that is used to minimize the offset voltage of a Hall element and an associated on-chip amplifier. Allegro patented a Chopper Stabilization technique that nearly eliminates Hall IC output drift induced by temperature or package stress effects. This offset reduction technique is based on a signal modulationdemodulation process. Modulation is used to separate the undesired DC offset signal from the magnetically induced signal in the frequency domain. Then, using a low-pass filter, the modulated DC offset is suppressed while the magnetically induced signal passes through the filter. The anti-aliasing filter prevents aliasing from happening in applications with high frequency signal components which are beyond the user’s frequency range of interest. As a result of this chopper stabilization approach, the output voltage from the Hall IC is desensitized to the effects of temperature and mechanical stress. This technique produces devices that have an extremely stable Electrical Offset Voltage, are immune to thermal stress, and have precise recoverability after temperature cycling. This technique is made possible through the use of a BiCMOS process that allows the use of low-offset and low-noise amplifiers in combination with high-density logic integration and sample and hold circuits. Regulator Clock/Logic Hall Element Amp Anti-aliasing Filter Sample and Hold Low-Pass Filter Concept of Chopper Stabilization Technique Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 14 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Package CB, 5-pin package, leadform PFF 0.5 R1 R3 14.0±0.2 3.0±0.2 5 4 A 3.5±0.2 0.8 17.5±0.2 13.00±0.10 1.5 4.0±0.2 1.50±0.10 1º±2° R2 0.5 B 4 21.4 3 1.91 4.40±0.10 Branded Face 2.9±0.2 5º±5° 1 2 3 +0.060 0.381 –0.030 3.5±0.2 LLLLLLL YYWW 1 7.00±0.10 C Standard Branding Reference View N = Device part number T = Temperature code A = Amperage range L = Lot number Y = Last two digits of year of manufacture W = Week of manufacture = Supplier emblem For Reference Only; not for tooling use (reference DWG-9111, DWG-9110) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A Dambar removal intrusion B Perimeter through-holes recommended C Branding scale and appearance at supplier discretion B PCB Layout Reference View NNNNNNN TTT - AAA 10.00±0.10 0.51±0.10 1.9±0.2 Creepage distance, current terminals to signal pins: 7.25 mm Clearance distance, current terminals to signal pins: 7.25 mm Package mass: 4.63 g typical Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 15 ACS758xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 100 μΩ Current Conductor Package CB, 5-pin package, leadform PSS 14.0±0.2 3.0±0.2 5 4 1.50±0.10 4.0±0.2 A 23.50±0.5 2.75±0.10 NNNNNNN TTT - AAA 13.00±0.10 LLLLLLL YYWW 4.40±0.10 Branded Face 3.18±0.10 11.0±0.05 1 2 3 1 B Standard Branding Reference View N = Device part number T = Temperature code A = Amperage range L = Lot number Y = Last two digits of year of manufacture W = Week of manufacture = Supplier emblem For Reference Only; not for tooling use (reference DWG-9111, DWG-9110) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown 7.00±0.10 A Dambar removal intrusion B Branding scale and appearance at supplier discretion 0.51±0.10 1.9±0.2 +0.060 0.381 –0.030 10.00±0.10 Creepage distance, current terminals to signal pins: 7.25 mm Clearance distance, current terminals to signal pins: 7.25 mm Package mass: 4.63 g typical Copyright ©2008-2009, Allegro MicroSystems, Inc. The products described herein are manufactured under one or more of the following U.S. patents: 5,619,137; 5,621,319; 6,781,359; 7,075,287; 7,166,807; 7,265,531; 7,425,821; or other patents pending. Allegro MicroSystems, Inc. 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 life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. 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 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 16