Allegro ACS714 current sensor datasheet

ManualsBrandsPololu ManualsCurrent & Voltage Sensors±5A ACS714 Current Sensor

Approximate Scale 1:1

Application 1. The ACS714 outputs an analog signal, V

OUT

that varies linearly with the uni- or bi-directional AC or DC

primary sensed current, I

, within the range specified. C

is recommended for noise management, with values that

depend on the application.

ACS714

Description

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 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 (>V

IOUT(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

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 1.5% typical, at T

= 25°C

 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

 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°C

Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor

with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor

Continued on the next page…

Package: 8 pin SOIC (suffix LC)

Typical Application

IP+

IP–

GND

ACS714

+5 V

VIOUT

OUT

FILTER

VCC

BYP

0.1 μF

1 nF

Summary of content (15 pages)

PAGE 1
ACS714 Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Features and Benefits Description ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ 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.
PAGE 2
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor ACS714 Description (continued) of 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 techniques.
PAGE 3
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.
PAGE 4
ACS714 Automotive Grade, 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 , CF = 1 nF, and VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. Max. Units 4.5 5.0 5.5 V – 10 13 mA ELECTRICAL CHARACTERISTICS Supply Voltage VCC Supply Current ICC VCC = 5.
PAGE 5
ACS714 Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor x05B PERFORMANCE CHARACTERISTICS1 over Range E: TA = –40°C to 85°C, CF = 1 nF, and VCC = 5 V, unless otherwise specified Characteristic Optimized Accuracy Range Sensitivity Symbol IP Sens Noise VNOISE(PP) Zero Current Output Slope Sensitivity Slope Electrical Output Voltage Total Output Error2 Test Conditions ∆IOUT(Q) ∆Sens Min. Typ. Max.
PAGE 6
ACS714 Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor x20A PERFORMANCE CHARACTERISTICS over Range E: TA = –40°C to 85°C1, CF = 1 nF, and VCC = 5 V, unless otherwise specified Characteristic Optimized Accuracy Range Sensitivity Noise Symbol Sens VNOISE(PP) Zero Current Output Slope Sensitivity Slope Test Conditions Min. Typ. Max.
PAGE 7
ACS714 Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor x30A PERFORMANCE CHARACTERISTICS over Range E: TA = –40°C to 85°C1, CF = 1 nF, and VCC = 5 V, unless otherwise specified Characteristic Optimized Accuracy Range Sensitivity Noise Symbol Sens VNOISE(PP) Zero Current Output Slope Sensitivity Slope Test Conditions Min. Typ. Max.
PAGE 8
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor ACS714 Characteristic Performance IP = 5 A, unless otherwise specified 10.30 10.25 10.20 10.15 10.10 10.05 10.00 9.95 9.90 9.85 9.80 9.75 -50 Supply Current versus Supply Voltage 10.9 10.8 10.7 ICC (mA) Mean ICC (mA) Mean Supply Current versus Ambient Temperature VCC = 5 V 10.6 VCC = 5 V 10.5 10.4 10.3 10.2 10.1 -25 0 25 50 75 100 125 10.0 4.
PAGE 9
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor ACS714 Characteristic Performance IP = 20 A, unless otherwise specified Supply Current versus Supply Voltage 9.7 10.4 9.6 10.2 VCC = 5 V 10.0 9.5 ICC (mA) Mean ICC (mA) Mean Supply Current versus Ambient Temperature VCC = 5 V 9.4 9.3 9.8 9.6 9.4 9.2 9.2 9.1 -50 -25 0 25 50 75 100 125 9.0 4.5 150 4.6 4.7 4.8 4.
PAGE 10
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor ACS714 Characteristic Performance IP = 30 A, unless otherwise specified Mean Supply Current versus Ambient Temperature Supply Current versus Supply Voltage 9.6 10.2 9.5 10.0 ICC (mA) Mean ICC (mA) 9.4 VCC = 5 V 9.3 9.2 9.8 VCC = 5 V 9.6 9.4 9.1 9.2 9.0 8.9 -50 -25 0 25 50 75 100 125 9.0 4.5 150 4.7 4.6 4.9 4.8 TA (°C) 0.45 –0.
PAGE 11
ACS714 Automotive Grade, 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).
PAGE 12
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor ACS714 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.
PAGE 13
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor ACS714 Chopper Stabilization Technique 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.
PAGE 14
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor ACS714 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.
PAGE 15
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor ACS714 Package LC, 8-pin SOIC 4.90 ±0.10 8° 0° 8 0.65 6.00 ±0.20 2 Branded Face 8X SEATING PLANE 0.10 C 1.27 BSC 1 1.27 0.40 0.25 BSC 0.51 0.31 5.60 1.04 REF A 1 C 1.27 1.75 0.25 0.17 3.90 ±0.10 8 C 2 PCB Layout Reference View SEATING PLANE GAUGE PLANE NNNNNNN PPT-AAA LLLLL 1.75 MAX 0.25 0.