ACS714 - Mantech Electronics

1 Approximate Scale 1:1 Application 1. The ACS714 outputs an analog signal, VOUT . that varies linearly with the uni- or bi-directional AC or DC primary sensed current, IP , within the range specified. CF is recommended for noise management, with values that depend on the Allegro ACS714 provides economical and precise solutions for AC or DC current sensing in automotive 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 overcurrent fault device consists of a precise, low-offset, linear Hall sensor circuit with a copper conduction path located near the surface of the die.

2 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 signal to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy after output of the device has a positive slope (>VIOUT(Q)) 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.

3 The internal resistance of this conductive path is m typical, providing low power loss. The thickness of the copper conductor allows survival ACS714 -DS, Rev. 3 Features and Benefits Low-noise analog signal path Device bandwidth is set via the FILTER pin 5 s output rise time in response to step input current 80 kHz bandwidth Total output error typical, at TA = 25 C Small footprint, low-profile SOIC8 package m internal conductor resistance kVRMS minimum isolation voltage from pins 1-4 to pins 5-8 V, single supply operation 66 to 185 mV/A output sensitivity Output voltage proportional to AC or DC currents Factory-trimmed for accuracy Extremely stable output offset voltage Nearly zero magnetic hysteresis Ratiometric output from supply voltage Operating temperature range, 40 C to 150 CAutomotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with kVRMS Voltage Isolation and a Low-Resistance Current ConductorContinued on the next.

4 8 pin SOIC (suffix LC)Typical ApplicationIP+IP+IP IP IP5 GND2413 ACS71478+5 FCF1 nFAutomotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with kVRMS Voltage Isolation and a Low-Resistance Current ConductorACS7142 Allegro MicroSystems, Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) the device at up to 5 overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS714 current sensor to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation ACS714 is provided in a small, surface mount SOIC8 package.

5 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 (continued)T V AmericaCertificate Number:U8V 06 05 54214 010 ParameterSpecificationFire and Electric No. 60950-1-03UL 60950-1:2003EN 60950-1:2001 Selection GuidePart NumberOptimized Range, IP(A)Sensitivity, Sens (Typ) (mV/A)TA ( C)Packing* ACS714 ELCTR-05B-T 5185 40 to 85 Tape and reel, 3000 pieces/reelACS714 ELCTR-20A-T 20100 ACS714 ELCTR-30A-T 3066 ACS714 LLCTR-05B-T 5185 40 to 150 ACS714 LLCTR-20A-T 20100 ACS714 LLCTR-30A-T 3066*Contact Allegro for additional packing Maximum RatingsCharacteristicSymbolNotesRatingUn itsSupply Voltage VCC8 VReverse Supply VoltageVRCC VoltageVIOUT8 VReverse Output VoltageVRIOUT Isolation VoltageVISOPins 1-4 and 5-8.

6 60 Hz, 1 minute, TA=25 C2100 VRated Input VoltageVworkingVoltage applied to leadframe (Ip+ pins)184 VAC MaxOutput Current Source IIOUT(Source) 3mAOutput Current Sink IIOUT(Sink)10mAOvercurrent Transient ToleranceIP1 pulse, 100 ms100 ANominal Operating Ambient TemperatureTARange E 40 to 85 CRange L 40 to 150 CMaximum Junction TemperatureTJ(max)165 CStorage TemperatureTstg 65 to 170 CAutomotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with kVRMS Voltage Isolation and a Low-Resistance Current ConductorACS7143 Allegro MicroSystems, Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) (Pin 8)(Pin 7)VIOUTRF(INT)GND(Pin 5)FILTER(Pin 6)Dynamic Offset CancellationIP+(Pin 1)IP+(Pin 2)IP (Pin 3)IP (Pin 4)SenseTrimSignalRecoverySense TemperatureCoefficient Trim0 AmpereOffset AdjustHall CurrentDrive+5 VIP+IP+IP IP VCCVIOUTFILTERGND12348765 Terminal List TableNumberNameDescription1 and 2IP+Terminals for current being sensed; fused internally3 and 4IP Terminals for current being sensed.

7 Fused internally5 GNDS ignal ground terminal6 FILTERT erminal for external capacitor that sets bandwidth7 VIOUTA nalog output signal8 VCCD evice power supply terminalFunctional Block DiagramPin-out DiagramAutomotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with kVRMS Voltage Isolation and a Low-Resistance Current ConductorACS7144 Allegro MicroSystems, Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) THERMAL Internal Leadframe TemperatureTAE range 40 85 CL range 40 150 CValueUnitsJunction-to-Lead Thermal Resistance2R JLMounted on the Allegro ASEK 714 evaluation board5 C/WJunction-to-Ambient Thermal ResistanceR JAMounted on the Allegro 85-0322 evaluation board, includes the power con-sumed by the board23 C/W1 Additional thermal information is available on the Allegro Allegro evaluation board has 1500 mm2 of 2 oz.

8 Copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connect-ing the layers. Performance values include the power consumed by the PCB. Further details on the board are available from the Frequently Asked Questions document on our website. Further information about board design and thermal performance also can be found in the Applications Informa-tion section of this OPERATING CHARACTERISTICS1 over full range of TA , CF = 1 nF, and VCC = 5 V, unless otherwise specifiedCharacteristicSymbolTest CHARACTERISTICSS upply CurrentICCVCC = V, output open 1013mAOutput Capacitance LoadCLOADVIOUT to GND 10nFOutput Resistive LoadRLOADVIOUT to k Primary Conductor ResistanceRPRIMARYTA = 25 C m Rise TimetrIP = IP(max), TA = 25 C, COUT = open 5 sFrequency Bandwidthf 3 dB, TA = 25 C.

9 IP is 10 A peak-to-peak 80 kHzNonlinearityELINOver full range of IP %SymmetryESYMOver full range of IP98100102%Zero Current Output VoltageVIOUT(Q)Bidirectional; IP = 0 A, TA = 25 C VCC VPower-On TimetPOOutput reaches 90% of steady-state level, TJ = 25 C, 20 A present on leadframe 35 sMagnetic Coupling2 12 G/AInternal Filter Resistance3RF(INT) 1 Device may be operated at higher primary current levels, IP, and ambient, TA , and internal leadframe temperatures, TA , provided that the Maximum Junction Temperature, TJ(max), is not = mT. 3RF(INT) forms an RC circuit via the FILTER Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with kVRMS Voltage Isolation and a Low-Resistance Current ConductorACS7145 Allegro MicroSystems, Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) PERFORMANCE CHARACTERISTICS1 over Range E.

10 TA = 40 C to 85 C, CF = 1 nF, and VCC = 5 V, unless otherwise specifiedCharacteristicSymbolTest Accuracy RangeIP 5 5 ASensitivitySensOver full range of IP, TA = 25 C180185190mV/ANoiseVNOISE(PP)Peak-to-pea k, TA = 25 C, 185 mV/A programmed Sensitivity, CF = 47 nF, COUT = open, 2 kHz bandwidth 21 mVZero Current Output Slope IOUT(Q)TA = 40 C to 25 C mV/ CTA = 25 C to 150 C mV/ CSensitivity Slope SensTA = 40 C to 25 C mV/A/ CTA = 25 C to 150 C mV/A/ CElectrical Output VoltageVOEIP = 0 A 40 40mVTotal Output Error2 ETOTIP = 5 A, TA = 25 C %1 Device may be operated at higher primary current levels, IP, and ambient temperatures, TA, provided that the Maximum Junction Temperature, TJ(max), is not of IP, with IP = 5 A.