Allegro Current Sensor provides economical precise solution current se

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Allegro Current Sensor provides economical precise solution current se

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Allegro Current Sensor: ACS750LCA-050
Allegro Current Sensor provides economical precise solution current sensing automotive industrial systems, packaged easy implementation. Typical applications include motor control, load management, switched mode power supplies over-current fault protection. sensor consists precision linear Hall optimized internal magnetic circuit increase device sensitivity. combination precisely controlled self-aligning assembly process (patents pending) factory programmed precision linear Hall sensor result high level performance product uniformity. power lead frame used current sensing (pins designed extremely power loss. power leads also electrically isolated from sensor leads (pins This isolation allows Allegro Current Sensor used applications requiring electrical isolation without opto-isolators other isolating feedback techniques.
Output Ip-+ Ip-1
ABSOLUTE MAXIMUM RATINGS Over-Current Supply Voltage, Vcc. Output Voltage Output Current Source.3mA Output Current Sink 10mA Operating Temperature .-40°C 150°C Storage Temperature.170°C Maximum junction temperature.165°C
Features Benefits Monolithic Hall High Reliability ACS750LCA-050: 150°C Ultra-low Power Loss: Resistance 120u Trimming Required Application Factory Trimmed Gain Offset Linearity Very Thermal Drift Offset Voltage 13kHz Bandwidth Operation Ratiometric Output from Supply Voltage On-chip transient protection Applications Automotive Systems Industrial Systems Motor Control Process Control Servo Systems Power Conversion Battery Monitors
Primary current flowing will generate output Vcc/2 pulse, duty cycle
Last updated December 2002
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
Allegro Current Sensor: ACS750LCA-050
Operating Characteristics Characteristic Symbol Test Conditions Min. ELECTRICAL CHARACTERISTICS Primary Sensed Current
-40°C 150°C
Typ.
Limits Max.
Units
Supply Voltage Supply Current =5.0V, Output open Output Resistance Rout Iout Isolation Voltage3 VISO Between pins tpropagation Propagation time ±50A; +25°C trespone Response time ±50A; +25°C trise time Rise time ±50A; +25°C Frequency Bandwidth -3dB PERFORMANCE CHARACTERISTICS (Over -40°C 150°C temperature range unless otherwise specified) 25.75 26.5 27.75 mV/A Sensitivity Sens ±50A; +25°C Peak peak; +25°C Noise4 40kHz Non-linearity ±50A, -40°C 150°C Symmetry ±50A, -40°C 150°C Quiescent Output Voltage +25°C Vcc/2 Thermal Drift -0.5 -0.15 +0.3 mV/°C VOQ(T) -2.5 Thermal Drift Sens Sens(T) ±50A; -40°C 150°C After excursion +/-150A Magnetic Core Hysteresis7 +/-0.3 +/-0.4 AmVA +25°C +25°C +/-0.4 +/-1.2 Accuracy Including offset -40°C 150°C +/-0.7 +/-1.8 +/-1 +/-2.5 ±50A; +25°C Full Total Accuracy8 Scale +/-5 +/-8.5 ±50A; -40°C 150°C
R.M.S. voltage isolation test, min. duration. Refer figure schematic test circuit Omitting magnetic hysteresis offset Sensitivity gain drift referenced 25°C Refer figure hysteresis temperature characterization Please contact Allegro sales representative competitive comparison
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
Last updated December 2002
Allegro Current Sensor: ACS750LCA-050
Definitions accuracy characteristics
Sensitivity: sensitivity change sensor output change through primary conductor. sensitivity product magnetic circuit sensitivity (G/A) linear amplifier gain (mV/G). linear amplifier gain trimmed optimize sensitivity (mV/A) full-scale current device. Variation sensitivity affected resolution Allegro linear sensitivity trim (~10uV/step) thermal drift (expressed %/C). Noise: noise product linear amplifier gain (mV/G) noise floor Allegro linear (~1Gauss). noise floor derived from thermal shot noise observed Hall elements. Dividing noise (mV) sensitivity (mV/A) provides smallest current that device able resolve. Linearity: linearity degree which voltage output from sensor varies direct proportion primary current through full-scale amplitude. Linearity reveals maximum deviation from ideal transfer curve this transducer. Non-linearity output attributed gain variation across temperature saturation flux concentrator approaching full scale current. following equation used derive linearity: [1-[(Vout_full-scale Amps -Vout_0A)/(2*(Vout_1/2 full-scale Amps -Vout_0A))]]*100 Symmetry: Symmetry degree which absolute voltage output from sensor varies proportion either positive negative full-scale primary current. following equation used derive symmetry: [(Vout_full-scale Amps -Vout_0A)/(Vout_0A Vout_-full-scale Amps)]*100 Quiescent output voltage: quiescent output voltage (VOQ) output sensor when primary current zero. unipolar supply voltage, nominally sits Vcc/2. translates into 2.5V. Variation attributed resolution Allegro linear quiescent voltage trim (~2.5mV), magnetic hysteresis, thermal drift (expressed %/C). Magnetic hysteresis (offset): magnetic offset residual magnetism (remanent field) that induces offset gauss. magnetic offset error highest when magnetic circuit been saturated, usually when device been subjected full scale high current overload conditions. magnetic offset largely dependent material used flux concentrator. most materials, largest magnetic offset observed lowest operating temperature. Accuracy: accuracy represents maximum deviation actual output from ideal value. This also known total error. accuracy illustrated graphically Figure accuracy divided into four areas particular interest defined below:
25°C: Accuracy sensing zero current flow 25°C, without effects temperature. over temperature: Accuracy sensing zero current flow including temperature effects. Full-scale current 25°C: Accuracy sensing full-scale current 25°C, without effects temperature. Full-scale current over temperature: Accuracy sensing full-scale current flow including temperature effects.
Last updated December 2002
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
Allegro Current Sensor: ACS750LCA-050
Figure Output Voltage Current, illustrating sensor accuracy full-scale current
Vout (Volts)
Accuracy Full Scale 25°C Only
Average Output
Accuracy Full Scale Over Temp
Accuracy 0Amp 25°C Only
Accuracy 0Amp Over Temp
(Amps) +/-75A Full Scale
Accuracy Full Scale 25°C Only
Accuracy Full Scale Over Temp
Figure Block diagram ACS750LCA-050 linear Hall Effect functionality
Figure Primary current versus typical output voltage across temperature
Last updated December 2002
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
Allegro Current Sensor: ACS750LCA-050
Iprimary typical Vout
Vout
-40C 150C
Amps
Figure Primary current versus typical sensitivity across temperature
Iprimary typical sensitivity
mV/A Amps -40C 150C
Last updated December 2002
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
Allegro Current Sensor: ACS750LCA-050
Figure Test circuit used determine peak peak noise linear output
Ohms Battery Coax Lead 22uF .47nF
5.1V Zener
Oscilloscope
24"Coax Lead
Figure Noise Analysis Linear Hall Effect within ACS750LCA-050 Package Peak Peak Noise Frequency Spectrum Noise
Figure Peak Peak Noise, Applying Pass Filter ACS750LCA-050 Output Pass Filter Break Peak Peak Noise Frequency 1.4MHz 34mV 400kHz 26mV 160kHz 19mV 80kHz 14mV 40kHz 10mV
Last updated December 2002
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
Allegro Current Sensor: ACS750LCA-050
Figure Peak Peak Hysteresis Across Temperature (after excursion +/-150A)
Temperature versus Typical Peak Peak Hysteresis Temp
Figure Rejection Transient Voltage Signal Iprimary, Typical Attenuation ~55dB
Last updated December 2002
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
Allegro Current Sensor: ACS750LCA-050
Figure Step response ACS750LCA-050, Iprimary
Definitions dynamic response characteristics
Propagation delay: Propagation delay time that takes sensor output reflect change primary current signal. Propagation delay typically measured 5usec attributed inductive
Last updated December 2002
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
Allegro Current Sensor: ACS750LCA-050
loading within linear package well inductive loop formed primacy conductor geometry. Propagation delay considered fixed time offset compensated.
Response time: Response time time between when primary current signal reaches final value when sensor reaches output corresponding applied current.
Rise time: Rise time time between sensor output reaching full scale value. rise time step response used derive bandwidth current sensor, which (-3dB) 0.35/tr. Both rise time response time detrimentally affected eddy current losses observed conductive ground plane varying degrees, ferrous flux concentrator within current sensor package.
Package thermal performance
Last updated December 2002
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
Allegro Current Sensor: ACS750LCA-050
Symbol Electrical resistance primary conductor Full-scale power dissipation Thermal resistance, Junction Rprimary Pprimary Test Conditions ±100A; +25°C ±100A; +25°C Tambient +25°C Typical Limits Max. Units °C/W
Figure Thermal performance current sensor, continuous current through primary conductor9
Self heating current sensor Primary current leads subjected continuous overcurrent Tambient ~25C
Temp
100A 240A
time (minutes)
Self heating current sensor Primary current leads subjected continuous overcurrent Tambient ~150C
Temp time (minutes)
100A 240A
PACKAGE DRAWING
Over current peak operation 225A peak, second duration with duty cycle
Last updated December 2002
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
Allegro Current Sensor: ACS750LCA-050
Last updated December 2002
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.
Allegro Current Sensor: ACS750LCA-050
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Last updated December 2002
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1993, 1995 Allegro MicroSystems, Inc.

Allegro Current Sensor provides economical precise solution current se

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