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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Features and Benefits
Low-noise analog signal path Device bandwidth is set via the new FILTER pin 5 s output rise time in response to step input current 80 kHz bandwidth Total output error 1.5% at TA = 25C Small footprint, low-profile SOIC8 package 1.2 m internal conductor resistance 2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8 5.0 V, single supply operation 133 to 185 mV/A output sensitivity Output voltage proportional to DC currents Factory-trimmed for accuracy Extremely stable output offset voltage Nearly zero magnetic hysteresis Ratiometric output from supply voltage
TUV America Certificate Number: U8V 06 05 54214 010
Description
The Allegro(R) ACS713 provides economical and precise solutions for DC current sensing in industrial, commercial, 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 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. 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 packaging. The 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. The internal resistance of this conductive path is 1.2 m typical, providing low power loss. The thickness of the copper conductor allows survival
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Package: 8 Lead SOIC (suffix LC)
Approximate Scale 1:1
Typical Application
+5 V 1 2 IP 3 4 IP+ VCC 8 7 VOUT CBYP 0.1 F
IP+ VIOUT ACS713 IP- FILTER IP- GND
6 5 CF
Application 1. The ACS713 outputs an analog signal, VOUT . that varies linearly with the unidirectional DC primary sensed current, IP , within the range specified. CF is recommended for noise management, with values that depend on the application. ACS713-DS, Rev. 4
ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
The ACS713 is provided in a small, surface mount SOIC8 package. 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 factory.
Description (continued) of the device at up to 5x overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS713 current sensor to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.
Selection Guide
Part Number ACS713ELCTR-20A-T ACS713ELCTR-30A-T Packing* Tape and reel, 3000 pieces/reel Tape and reel, 3000 pieces/reel TA (C) -40 to 85 -40 to 85 Optimized Range, IP (A) 0 to 20 0 to 30 Sensitivity, Sens (Typ) (mV/A) 185 133
*Contact Allegro for additional packing options.
Absolute Maximum Ratings
Characteristic Supply Voltage Reverse Supply Voltage Output Voltage Reverse Output Voltage Reinforced Isolation Voltage Symbol VCC VRCC VIOUT VRIOUT Pins 1-4 and 5-8; 60 Hz, 1 minute, TA=25C VISO Voltage applied to leadframe (Ip+ pins), based on IEC 60950 Pins 1-4 and 5-8; 60 Hz, 1 minute, TA=25C Basic Isolation Voltage Output Current Source Output Current Sink Overcurrent Transient Tolerance Nominal Operating Ambient Temperature Maximum Junction Temperature Storage Temperature VISO(bsc) IOUT(Source) IOUT(Sink) IP TA TJ(max) Tstg 1 pulse, 100 ms Range E Voltage applied to leadframe (Ip+ pins), based on IEC 60950 Notes Rating 8 -0.1 8 -0.1 2100 184 1500 354 3 10 100 -40 to 85 165 -65 to 170 Units V V V V V Vpeak V Vpeak mA mA A C C C
Parameter Fire and Electric Shock
Specification
CAN/CSA-C22.2 No. 60950-1-03 UL 60950-1:2003 EN 60950-1:2001
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Functional Block Diagram
+5 V VCC (Pin 8)
Hall Current Drive
IP+ (Pin 1)
Sense Temperature Coefficient Trim
Dynamic Offset Cancellation
IP+ (Pin 2)
Signal Recovery
VIOU T (Pin 7)
IP- (Pin 3) IP- (Pin 4)
Sense Trim 0 Ampere Offset Adjust
GND (Pin 5)
FILTER (Pin 6)
Pin-out Diagram
IP+ IP+ IP- IP- 1 2 3 4 8 7 6 5 VCC VIOUT FILTER GND
Terminal List Table
Number 1 and 2 3 and 4 5 6 7 8 Name IP+ IP- GND FILTER VIOUT VCC Description Input terminals for current being sensed; fused internally Output terminals for current being sensed; fused internally Signal ground terminal Terminal for external capacitor that sets bandwidth Analog output signal Device power supply terminal
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
COMMON OPERATING CHARACTERISTICS1 over full range of TA, and VCC = 5 V, unless otherwise specified
Characteristic Supply Voltage Supply Current Output Capacitance Load Output Resistive Load Primary Conductor Resistance Rise Time Frequency Bandwidth Nonlinearity Symmetry Zero Current Output Voltage Power-On Time Magnetic Coupling2 Internal Filter Resistance3
1Device
Symbol VCC ICC CLOAD RLOAD RPRIMARY tr f ELIN ESYM VIOUT(Q) tPO RF(INT)
Test Conditions
Min. 4.5
Typ. 5.0 10 - - 1.2 5 80 1.5 100 VCC x 0.1 35 12 1.7
Max. 5.5 13 10 - - - - - 102 - - -
Units V mA nF k m s kHz % % V s G/A k
ELECTRICAL CHARACTERISTICS VCC = 5.0 V, output open VIOUT to GND VIOUT to GND TA = 25C IP = IP(max), TA = 25C, COUT = 10 nF -3 dB, TA = 25C; IP is 10 A peak-to-peak Over full range of IP , IP applied for 5 ms Over full range of IP , IP applied for 5 ms Unidirectional; IP = 0 A, TA = 25C Output reaches 90% of steady-state level, no capacitor on FILTER pin; TJ = 25; 20 A present on leadframe - - 4.7 - - - - 98 - - -
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 exceeded. 21G = 0.1 mT. 3R F(INT) forms an RC circuit via the FILTER pin.
COMMON THERMAL CHARACTERISTICS1
Min. Operating Internal Leadframe Temperature Junction-to-Lead Thermal Resistance2 Junction-to-Ambient Thermal Resistance2,3
1Additional 2The Allegro
Typ. -
Max. 85 Value 5 23
Units C Units C/W C/W
TA RJL RJA
E range Mounted on the Allegro ASEK 713 evaluation board
-40
Mounted on the Allegro 85-0322 evaluation board, includes the power consumed by the board
thermal information is available on the Allegro website. evaluation board has 1500 mm2 of 2 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connecting 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 Information section of this datasheet. 3R JA values shown in this table are typical values, measured on the Allegro evaluation board. The actual thermal performance depends on the actual application board design, the airflow in the application, and thermal interactions between the sensor and surrounding components through the PCB and the ambient air. To improve thermal performance, see our applications material on the Allegro website.
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
x20A PERFORMANCE CHARACTERISTICS TA = -40C to 85C1; VCC = 5 V, unless otherwise specified
Characteristic Optimized Accuracy Range Sensitivity Noise Zero Current Output Slope Sensitivity Slope Total Output Error2
1Device
Symbol IP Sens
Test Conditions Over full range of IP, TA = 25C
Min. 0 178 - - - - - -
Typ. - 185 21 0.08 0.16 0.035 0.019 1.5
Max. 20 190 - - - - - -
Units A mV/A mV mV/C mV/C mV/A/C mV/A/C %
Peak-to-peak, TA = 25C, 2 kHz external filter, 185 mV/A VNOISE(PP) programmed Sensitivity, CF = 47 nF, COUT = 10 nF, 2 kHz bandwidth IOUT(Q) Sens ETOT TA = -40C to 25C TA = 25C to 150C TA = -40C to 25C TA = 25C to 150C IP = 20 A , IP applied for 5 ms; TA = 25C
may be operated at higher primary current levels, IP, and ambient temperatures, TA, provided that the Maximum Junction Temperature, TJ(max), is not exceeded. 2Percentage of I , with I = 20 A. Output filtered. P P
x30A PERFORMANCE CHARACTERISTICS TA = -40C to 85C1; VCC = 5 V, unless otherwise specified
Characteristic Optimized Accuracy Range Sensitivity Noise Zero Current Output Slope Sensitivity Slope Total Output Error2
1Device
Symbol IP Sens
Test Conditions Over full range of IP, TA = 25C
Min. 0 129 - - - - - -
Typ. - 133 15 0.06 0.1 0.007 -0.025 1.5
Max. 30 137 - - - - - -
Units A mV/A mV mV/C mV/C mV/A/C mV/A/C %
Peak-to-peak, TA = 25C, 2 kHz external filter, 133 mV/A VNOISE(PP) programmed Sensitivity, CF = 47 nF, COUT = 10 nF, 2 kHz bandwidth IOUT(Q) Sens ETOT TA = -40C to 25C TA = 25C to 150C TA = -40C to 25C TA = 25C to 150C IP = 30 A , IP applied for 5 ms; TA = 25C
may be operated at higher primary current levels, IP, and ambient temperatures, TA, provided that the Maximum Junction Temperature, TJ(max), is not exceeded. 2Percentage of I , with I = 30 A. Output filtered. P P
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Characteristic Performance
IP = 20 A, unless otherwise specified
11.2 11.0 10.8 ICC (mA) VCC = 5 V 10.6 10.4 10.2 10.0 9.8 -25 0 25 50 TA (C) 75 100 125 150 9.6 4.5 4.6 4.7 4.8 4.9 5.0 5.1 VCC (V) 5.2 5.3 5.4 5.5 VCC = 5 V
Mean Supply Current versus Ambient Temperature
10.5 10.4 10.3 Mean ICC (mA) 10.2 10.1 10.0 9.9 9.8 9.7 9.6 -50
Supply Current versus Supply Voltage
Magnetic Offset versus Ambient Temperature
0 -0.5 -1.0 IOM (mA) -2.0 -2.5 -3.0 -3.5 -4.0 -4.5 -5.0 -50 -25 0 25 50 TA (C) 75 100 125 150 VCC = 5 V; IP = 0 A, After excursion to 20 A ELIN (%) -1.5
Nonlinearity versus Ambient Temperature
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
Mean Total Output Error versus Ambient Temperature
10 8 ETOT (%) Sens (mV/A) 6 4 2 0 -2 -4 -6 -8 -50 -25 0 25 50 TA (C) 75 100 125 150 188 187 186 185 184 183 182
Sensitivity versus Ambient Temperature
-50
-25
0
25
50 TA (C)
75
100
125
150
Output Voltage versus Sensed Current
5.0 4.5 VIOUT (V) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 5 10 IP (A) 15 20 25 TA (C) -40 -20 25 85 125 VCC = 5 V Sens (mV/A) 4.0 200.00 198.00 196.00 194.00 192.00 190.00 188.00 186.00 184.00 182.00 180.00 178.00 176.00 174.00
Sensitivity versus Sensed Current
TA (C) -40 25 85 150 0 5 10 15 Ip (A) 20 25
0 A Output Voltage versus Ambient Temperature
525 520 VIOUT(Q) (mV) 515 510 505 500 495 490 -50 -25 0 25 50 TA (C) 75 100 125 150 IP = 0 A
0 A Output Voltage Current versus Ambient Temperature
-19.75 -19.80 -19.85 IOUT(Q) (A) -19.90 -19.95 -20.00 -20.05 -20.10 -50 -25 0 25 50 TA (C) 75 100 125 150 IP = 0 A
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Characteristic Performance
IP = 30 A, unless otherwise specified
10.8 10.6 ICC (mA) 10.4 10.2 10.0 9.8 9.6 9.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 VCC (V) 5.2 5.3 5.4 5.5 VCC = 5 V
Mean Supply Current versus Ambient Temperature
10.1 10.0 9.9 Mean ICC (mA) 90.8 9.7 9.6 9.5 9.4 -50 VCC = 5 V
Supply Current versus Supply Voltage
-25
0
25
50 TA (C)
75
100
125
150
Magnetic Offset versus Ambient Temperature
0 -0.5 -1.0 IOM (mA) -2.0 -2.5 -3.0 -3.5 -4.0 -4.5 -5.0 -50 -25 0 25 50 TA (C) 75 100 125 150 VCC = 5 V; IP = 0 A, After excursion to 20 A ELIN (%) -1.5
Nonlinearity versus Ambient Temperature
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 VCC = 5 V
Mean Total Output Error versus Ambient Temperature
8 6 Sens (mV/A) 4 ETOT (%) 2 0 -2 -4 -6 -8 -50 -25 0 25 50 TA (C) 75 100 125 150 133.5 133.0 132.5 132.0 131.5 131.0 130.5 130.0
Sensitivity versus Ambient Temperature
129.5 -50
-25
0
25
50 TA (C)
75
100
125
150
Output Voltage versus Sensed Current
5.0 4.5 VIOUT (V) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 5 10 15 20 IP (A) 25 30 35 TA (C) -40 -20 25 85 125 VCC = 5 V Sens (mV/A) 4.0 140 139 138 137 136 135 134 133 132 131 130 129 128 127 126 125 0
Sensitivity versus Sensed Current
TA (C) -40 25 85 150 5 10 15 20 Ip (A) 25 30 35
0 A Output Voltage versus Ambient Temperature
514 512 510 VIOUT(Q) (mV) 508 506 504 502 500 498 496 494 -50 -25 0 25 50 TA (C) 75 100 125 150 IP = 0 A
0 A Output Voltage Current versus Ambient Temperature
0 -5 -10 IOUT(Q) (A) -15 -20 -25 -30 -35 -50 IP = 0 A
-25
0
25
50 TA (C)
75
100
125
150
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Definitions of Accuracy Characteristics
Sensitivity (Sens). The change in sensor 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 full-scale current of the device. Noise (VNOISE). The product of the linear IC amplifier gain (mV/G) and the noise floor for the Allegro Hall effect linear IC (1 G). 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 (ELIN). The degree to which the voltage output from the sensor varies in direct proportion to the primary current through its full-scale amplitude. Nonlinearity in the output can be attributed to the saturation of the flux concentrator approaching the full-scale current. The following equation is used to derive the linearity:
100 1-
Accuracy is divided into four areas: * 0 A at 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 at 25C. Accuracy of sensing the full-scale current at 25C, without the effects of temperature. * Full-scale current over temperature. Accuracy of sensing fullscale current flow including temperature effects. Ratiometry. The ratiometric feature means that its 0 A output, VIOUT(Q), (nominally equal to VCC/2) and sensitivity, Sens, are proportional to its supply voltage, VCC . The following formula is used to derive the ratiometric change in 0 A output voltage, VIOUT(Q)RAT (%).
100 VIOUT(Q)VCC / VIOUT(Q)5V
{[
(VIOUT_full-scale amperes -VIOUT(Q) ) 2 (VIOUT_half-scale amperes - VIOUT(Q))
[{
The ratiometric change in sensitivity, SensRAT (%), is defined as:
SensVCC / Sens5V
VCC / 5 V
where VIOUT_full-scale amperes = the output voltage (V) when the sensed current approximates full-scale IP . Quiescent output voltage (VIOUT(Q)). The output of the sensor 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 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. To convert this voltage to amperes, divide by the device sensitivity, Sens. Accuracy (ETOT). The accuracy represents the maximum deviation of the actual output from its ideal value. This is also known as the total ouput error. The accuracy is illustrated graphically in the output voltage versus current chart at right.
100
VCC / 5 V
Output Voltage versus Sensed Current
Accuracy at 0 A and at Full-Scale Current
Increasing VIOUT(V)
Accuracy Over Temp erature Accuracy 25C Only Average VIOUT Accuracy Over Temp erature
Accuracy 25C Only
-IP (A)
30 A
+IP (A)
Full Scale
0A
Decreasing VIOUT(V)
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance 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 sensor 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 current sensor, in which (-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
Transducer Output 10 0 Rise Time, tr t
200 180 160 140 120 100 80 60 40 20 0 0
Power on Time versus External Filter Capacitance 10000 IP =5 A IP =0 A 1000
Noise(p-p) (mA)
Noise vs. Filter Cap
Noise versus External Filter Capacitance
tPO (s)
100 10 1 0.01
10
20
CF (nF)
30
40
50
0.1
1
CF (nF)
10
100
1000
Rise Time versus External Filter Capacitance 1200 1000 tr(s) 800 600 400 200 0 0 100 CF (nF) 0 1 4.7 10 22 47 100 220 470 500 tr (s) 6.6 7.7 17.4 32.1 68.2 88.2 291.3 623.0 1120.0 400 350 300 250 200 150 100 50 0 0
Rise Time versus External Filter Capacitance
}
Expanded in chart at right 200 CF (nF) 300 400
tr(s)
25
50
75 CF (nF)
100
125
150
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance 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 modulation-demodulation 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.
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 Sample and Hold Low-Pass Filter
Concept of Chopper Stabilization Technique
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Typical Applications
+5 V CBYP 0.1 F
+5 V CBYP 0.1 F RPU 100 k 1 7 VOUT 4 3 6 5 CF D1 1N914 VCC 8 7 RF 1 k 6 5 CF 0.01 F
R1 33 k
R1 100 k
1 2 IP 3 4
IP+
VCC
IP+ VIOUT ACS713 IP- FILTER IP- GND
- +
1
Fault IP
2
IP+ VIOUT ACS713
2 U1 LMV7235
3 4
IP- FILTER IP- GND
Application 2. 10 A Overcurrent Fault Latch. Fault threshold set by R1 and R2. This circuit latches an overcurrent fault and holds it until the 5 V rail is powered down.
VS1
Application 3. This configuration increases gain to 610 mV/A (tested using the ACS712ELC-05A).
+5 V VS2 +5 V
1 2 IP1
IP+
VCC
8 7 VOUT
CBYP 0.1 F 1 U1 LMC6772 IP2 3 CF 4 Q3 2N7002 2 IP+ VCC
IP+ VIOUT ACS713
IP+ VIOUT ACS713 IP- FILTER IP- GND
Application 4. Control circuit for MOSFET ORing.
3 4
IP- FILTER IP- GND
6 5
6 5 CF
Q1 FDS6675a R1 100 k
R3 10 k
Q2 FDS6675a R2 100 k LOAD
R4 10 k
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
-
-
VREF
VREF
+
-
5
IP+
3
+
8
R2 100 k
R2 100 k
1
5 2
LM321 4 VOUT
R3 3.3 k
C1 1000 pF
8 7 VOUT
CBYP 0.1 F U2 LMC6772
+
Q4 2N7002
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ACS713
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Improving Sensing System Accuracy Using the FILTER Pin In low-frequency sensing applications, it is often advantageous to add a simple RC filter to the output of the sensor. Such a lowpass filter improves the signal-to-noise ratio, and therefore the resolution, of the sensor output signal. However, the addition of an RC filter to the output of a sensor IC can result in undesirable sensor output attenuation -- even for dc signals. Signal attenuation, VATT , is a result of the resistive divider effect between the resistance of the external filter, RF (see Application 5), and the input impedance and resistance of the customer interface circuit, RINTFC. The transfer function of this resistive divider is given by:
VATT = VIOUT
temperature. Therefore, signal attenuation will vary as a function of temperature. Note that, in many cases, the input impedance, RINTFC , of a typical analog-to-digital converter (ADC) can be as low as 10 k. The ACS713 contains an internal resistor, a FILTER pin connection to the printed circuit board, and an internal buffer amplifier. With this circuit architecture, users can implement a simple RC filter via the addition of a capacitor, CF (see Application 6) from the FILTER pin to ground. The buffer amplifier inside of the ACS713 (located after the internal resistor and FILTER pin connection) eliminates the attenuation caused by the resistive divider effect described in the equation for VATT. Therefore, the ACS713 device is ideal for use in high-accuracy applications that cannot afford the signal attenuation associated with the use of an external RC low-pass filter.
VCC Pin 8
RF + RINTFC
RINTFC
.
Even if RF and RINTFC are designed to match, the two individual resistance values will most likely drift by different amounts over
+5 V Pin 3 Pin 4 IP- IP-
Allegro ACS706
Dynamic Offset Cancellation
Application 5. When a low pass filter is constructed externally to a standard Hall effect device, a resistive divider may exist between the filter resistor, RF, and the resistance of the customer interface circuit, RINTFC. This resistive divider will cause excessive attenuation, as given by the transfer function for VATT.
Voltage Regulator To all subcircuits
VIOUT Pin 7
Resistive Divider
Input
Filter
0.1 F
Amp
Out
N.C. Pin 6
RF
Application Interface Circuit
Low Pass Filter
Gain Temperature Coefficient Trim Control Offset
CF
RINTFC
IP+ IP+ Pin 1 Pin 2
GND Pin 5
+5 V VCC Pin 8
Dynamic Offset Cancellation
Application 6. Using the FILTER pin provided on the ACS713 eliminates the attenuation effects of the resistor divider between RF and RINTFC, shown in Application 5.
Allegro ACS713
Hall Current Drive IP+ Pin 1 IP+ Pin 2
Sense Temperature Coefficient Trim
Buffer Amplifier and Resistor
Signal Recovery
VIOUT Pin 7
Input
IP- Pin 3 IP- Pin 4
Sense Trim 0 Ampere Offset Adjust
Application Interface Circuit
RINTFC
GND Pin 5
FILTER Pin 6
CF
Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
12
ACS713
Package LC, 8-pin SOIC
Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
4.90 8
4
0.21
3.90 A
6.00 0.84
1
2 0.25 SEATING PLANE GAUGE PLANE All dimensions nominal, not for tooling use (reference JEDEC MS-012 AA) Dimensions in millimeters A Terminal #1 mark area
8X 0.10 C 0.41 1.27 0.18
SEATING PLANE 1.75 MAX
C
Package Branding
1 2 3 4
8 7 6 5
Text 1 Text 2 Text 3
Two alternative patterns are used
ACS713T RLCPPP YYWWA
ACS 713 T R LC PPP YY WW A
Allegro Current Sensor Device family number Indicator of 100% matte tin leadframe plating Operating ambient temperature range code Package type designator Primary sensed current Date code: Calendar year (last two digits) Date code: Calendar week Date code: Shift code
ACS713T RLCPPP L...L YYWW
ACS 713 T R LC PPP L...L YY WW
Allegro Current Sensor Device family number Indicator of 100% matte tin leadframe plating Operating ambient temperature range code Package type designator Primary sensed current Lot code Date code: Calendar year (last two digits) Date code: Calendar week
Copyright (c)2006, 2007, Allegro MicroSystems, Inc. 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'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, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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