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| Current Sensor: ACS750xCA-075 5 4 The Allegro ACS750 family of current sensors provides economical and precise solutions for current sensing in industrial, commercial, automotive, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switched mode power supplies and over-current fault protection. The sensor consists of a precision linear Hall IC optimized to an internal magnetic circuit to increase device sensitivity. The combination of a precisely controlled self-aligning assembly process (patents pending) and the factory programmed precision of the linear Hall sensor result in high level performance and product uniformity. The primary conductor used for current sensing (terminals 4 and 5) is designed for extremely low power loss. The power terminals are also electrically isolated from the sensor leads (pins 1 - 3). This allows the ACS750 family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. The output of the device has a positive slope (>Vcc/2) when an increasing current flows from terminal 4 to terminal 5. Features and Benefits * Monolithic Hall IC for High Reliability * Single +5V Supply * High Isolation Voltage * Lead-free * Automotive Temperature Range * End-of-line Factory Trimmed for Gain and Offset * Ultra-low Power Loss: Low Resistance of Primary Conductor * Ratiometric Output from Supply Voltage * Low Thermal Drift of Offset Voltage * On-chip Transient Protection * Small Package Size with Easy Mounting Capability Applications * Automotive Systems * Industrial Systems * Motor Control * Servo Systems * Power Conversion * Battery Monitors 123 Pin 1: Pin 2: Pin 3: Pin 4: Pin 5: Vcc Gnd Output Ip+ Ip- ABSOLUTE MAXIMUM RATINGS Operating Temperature `S'.............................. -20 to +85C `L'............................ -40 to +150C Supply Voltage, Vcc 16V Output Voltage 16V Output Current Source 3mA Output Current Sink 10mA Maximum Storage Temperature 170C Maximum Junction Temperature 165C Thermal Resistance, RJA TBD C/W Always order by complete part number: ACS750SCA-075 or ACS750LCA-075 31Oct03, CMG, Rev 2.0 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003, Allegro MicroSystems, Inc. 1 Current Sensor: ACS750xCA-075 Characteristic Symbol Test Conditions Limits ELECTRICAL CHARACTERISTICS, over temperature unless otherwise stated Min. Typ. Max. Primary Sensed Current IP -75 75 Supply Voltage VCC 4.5 5.0 5.5 Supply Current ICC Vcc = 5.0V, output open 7 10 Output Resistance ROUT Iout = 1.2 mA 1 2 Primary Conductor RPRIMARY 130 IP = 100A; +25C Resistance Pins 1-3 and 4-5, Isolation Voltage VISO 2.5 60 Hz, 1 minute PERFORMANCE CHARACTERISTICS, -20 C to +85 C, Vcc = 5V unless otherwise specified Propagation time tPROP 4 IP = 50A (75A TBD) Response time tRESPONSE 27 IP = 50A (75A TBD) Rise time tr 26 IP = 50A (75A TBD) Frequency Bandwidth f -3dB 13 18.75 19.75 20.75 IP, T = +25C Sensitivity Sens 17.5 21.5 IP, Over Temperature Peak-to-Peak; T = +25C Noise VNOISE 7 External Filter BW = 24kHz Non-linearity EL +/- 5 IP Symmetry ES 97 100 103 IP I = 0A, T = +25C -40 Vcc/2 +40 Electrical Offset Voltage VOE (Magnetic error not included) I = 0A, Over Temperature -50 Vcc/2 +50 Magnetic Offset Error VOM I = 0A, after excursion of 100A +/- 0.3 +/- 0.8 +/- 1 IP, T = +25C Total Accuracy XIp (Including all offsets) +/- 13 IP, Over Temperature PERFORMANCE CHARACTERISTICS, -40 C to +150 C, Vcc = 5V unless otherwise specified Propagation time tPROP 4 IP = 50A (75A TBD) Response time tRESPONSE 27 IP = 50A (75A TBD) Rise time tr 26 IP = 50A (75A TBD) Frequency Bandwidth f -3dB 13 18.75 19.75 20.75 IP, T = +25C Sensitivity Sens 16.5 23 IP, Over Temperature Peak to Peak; T = +25C 7 Noise VNOISE External Filter BW = 40kHz Non-linearity EL +/- 5 IP Symmetry ES 97 100 103 IP I = 0A, T = +25C -40 Vcc/2 +40 Electrical Offset Voltage VOE (Magnetic error not included) I = 0A, Over Temperature -60 Vcc/2 +60 Magnetic Offset Error VOM I = 0A, after excursion of 100A +/- 0.3 +/- 0.8 +/- 1 IP, T = +25C Total Accuracy XIp (Including all offsets) +/- 15 IP, Over Temperature Units A V mA kV s kHz mV/A mV/A mV % % mV mV A % s kHz mV/A mV/A mV % % mV mV A % 31Oct03, CMG, Rev 2.0 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003, Allegro MicroSystems, Inc. 2 Current Sensor: ACS750xCA-075 Functional Block Diagram 31Oct03, CMG, Rev 2.0 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003, Allegro MicroSystems, Inc. 3 Current Sensor: ACS750xCA-075 Typical Performance Characteristics Supply Current Vcc = 5V 200 units / 2 CS lots / 1 IC lot 25 8 7.8 7.6 Sensitivity Vcc = 5V 200 units / 2 CS lots / 1 IC lot 20 Sensitivity [mV/A] 7.4 Icc [mA] 7.2 7 6.8 6.6 6.4 6.2 6 -50 -25 0 25 50 75 100 125 150 Temperature [C] 15 10 5 -40C -20C 25C 85C 150C 0 -100 -75 -50 -25 25 50 75 100 Primary Current (A) Vout vs Primary Current Vcc = 5V 200 units / 2 CS lots / 1 IC lot 4.5 4 3.5 Vout (V) 3 2.5 2 1.5 1 0.5 -100 -75 -50 -25 0 25 Primary Current (A) 50 75 100 -40C -20C 25C 85C 150C 100.5 100.4 100.3 100.2 Symmetry [%] 100.1 100 99.9 99.8 99.7 99.6 99.5 -50 -25 0 Symmetr Vcc = 200 units / 2 CS lots / 1 5V IC l t Ip = 75A 25 50 75 Temperature [C] 100 125 150 Linearity Vcc = 5V 200 units / 2 CS lots / 1 IC lot 5 Linearity @ -75 Amps [%] 4.5 Linearity @ +75 Amp s [%] 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 Linearity Vcc = 5V 200 units / 2 CS lots / 1 IC lot 4 3.5 3 2.5 2 1.5 1 0.5 0 -50 -25 0 25 50 75 100 125 150 Temperature [C] Ip = +75A Ip = -75A -50 -25 0 25 50 75 Temperature [C] 100 125 150 31Oct03, CMG, Rev 2.0 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003, Allegro MicroSystems, Inc. 4 Current Sensor: ACS750xCA-075 Typical Performance Characteristics (continued) Magnetic Offset Vcc = 5V 200 units / 2 CS lots / 1 IC lot 1 0.8 Magnetic Offset [A] 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -50 -25 0 25 50 75 Temperature [C] 100 125 150 I = 0 A, after excursion to 100 A 1 0.8 0 Amp Accuracy [A] 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 -50 -25 0 Amp Accuracy Vcc = 5V Without Offset 200 units / 2 CS lots / 1 IC lot 0 25 50 75 Temperature [C] 100 125 150 31Oct03, CMG, Rev 2.0 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003, Allegro MicroSystems, Inc. 5 Current Sensor: ACS750xCA-075 Definitions of Accuracy Characteristics Sensitivity: The sensitivity is the change in sensor output to 1A 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 trimmed at the factory to optimize the sensitivity (mV/A) for the full-scale current of the device. Noise: The noise is the product of the linear IC amplifier gain (mV/G) and the noise floor for the Allegro Hall effect linear IC (~1Gauss). 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. Linearity: The linearity is the degree to which the voltage output from the sensor varies in direct proportion to the primary current through its full-scale amplitude. Linearity reveals the maximum deviation from the ideal transfer curve for this transducer. Non-linearity in the output can be attributed to the gain variation across temperature and saturation of the flux concentrator approaching the full scale current. The following equation is used to derive the linearity: [1-[(Vout_full-scale Amps -Vout_0A)/(2*(Vout_1/2 full-scale Amps -Vout_0A))]]*100 Symmetry: Symmetry is the degree to which the absolute voltage output from the sensor varies in proportion to either a positive or negative full-scale primary current. The following equation is used to derive symmetry: [(Vout_full-scale Amps -Vout_0A)/(Vout_0A - Vout_-full-scale Amps)]*100 Electrical offset voltage: The quiescent output voltage (VOE) is the output of the sensor when the primary current is zero. For a unipolar supply voltage, VOE nominally sits at Vcc/2. Vcc = 5V translates into VOE = 2.5V. Variation in VOE can be attributed to the resolution of the Allegro linear IC quiescent voltage trim, magnetic hysteresis, and thermal drift. Magnetic offset error: 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 largest magnetic offset is observed at the lowest operating temperature. Accuracy: The accuracy represents the maximum deviation of the actual output from its ideal value. This is also known as the total error. The accuracy is illustrated graphically in Figure #1. The accuracy is divided into four areas as defined below: * * * * 0 A @ 25C: Accuracy of sensing zero current flow at 25C, without the effects of temperature. 0 A over temperature: Accuracy of sensing zero current flow including temperature effects. Full-scale current @ 25C: Accuracy of sensing the full-scale current at 25C, without the effects of temperature. Full-scale current over temperature: Accuracy of sensing full-scale current flow including temperature effects. 31Oct03, CMG, Rev 2.0 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003, Allegro MicroSystems, Inc. 6 Current Sensor: ACS750xCA-075 Figure 1: Output Voltage vs. Current, illustrating sensor accuracy at 0A and full-scale current Accuracy Full Scale 25C Only VOUT (Volts) Average Output Accuracy Full Scale Over Temp Accuracy 0Amp 25C Only Accuracy 0Amp Over Temp IP (Amps) +/-75A Full Scale Accuracy Full Scale 25C Only Accuracy Full Scale Over Temp 31Oct03, CMG, Rev 2.0 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003, Allegro MicroSystems, Inc. 7 Current Sensor: ACS750xCA-075 Definitions of Dynamic Response Characteristics Propagation delay: Propagation delay is the time that it takes for the sensor 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 the inductive loop formed by the primacy conductor geometry. Propagation delay can be considered as a fixed time offset and may be compensated. Response time: Response time is the time between when the primary current signal reaches 90% of its final value and when the sensor reaches 90% of its output corresponding to the applied current. Rise time: Rise time is the time between the sensor's output reaching 10 and 90% of its full scale value. The rise time to a step response is used to derive the bandwidth of the current sensor, in which (-3dB) = 0.35/tr. Both rise time and response time are detrimentally affected by eddy current losses observed in the conductive IC ground plane and, to varying degrees, in the ferrous flux concentrator within the current sensor package. 31Oct03, CMG, Rev 2.0 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003, Allegro MicroSystems, Inc. 8 Current Sensor: ACS750xCA-075 Peak to Peak Noise, applying low-pass filter to ACS750 output Low Pass Filter Break Frequency Unfiltered 1.4MHz 400kHz 160kHz 80kHz 24kHz Typical Peak to Peak Noise 22.7 mV 21 mV TBD TBD TBD 7.1 mV Step Resonsponse, IPRIMARY = 0 to 50A ACS750 Output 31Oct03, CMG, Rev 2.0 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003, Allegro MicroSystems, Inc. 9 Current Sensor: ACS750xCA-075 PACKAGE DRAWING Notes: 1. 2. 3. 4. This drawing is only a preliminary issue and no tolerances are implied to any dimensions. Draft angle is 10 unless otherwise specified. There is no plating in areas that are trimmed. SIP lead flash along the edge or sides for 3mm from the package due to resin bleeding. 31Oct03, CMG, Rev 2.0 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003, Allegro MicroSystems, Inc. 10 Current Sensor: ACS750xCA-075 The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and 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 products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties that may result from its use. 31Oct03, CMG, Rev 2.0 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 2003, Allegro MicroSystems, Inc. 11 |
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