Data Sheet

ManualsBrandsDFRobot ManualsCurrent & Voltage SensorsGravity Analog 20A Current Sensor

IP+

IP–

GND

ACS712

+5 V

VIOUT

OUT

FILTER

VCC

BYP

0.1 µF

1 nF

Application 1. The ACS712 outputs an analog signal, V

OUT

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

primary sampled current, I

, within the range specified. C

is recommended for noise management, with values that

depend on the application.

ACS712

Description

The Allegro

™

ACS712 provides economical and precise

solutions for AC or 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, switch-

mode power supplies, and overcurrent fault protection. The

device is not intended for automotive applications.

The device consists of a precise, low-offset, linear Hall 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 the Hall IC converts 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 sampling. The internal resistance of

this conductive path is 1.2 mΩ typical, providing low power

loss. The thickness of the copper conductor allows survival of

ACS712-DS, Rev. 15

Features and Benefits

▪ Low-noise analog signal path

▪ Device bandwidth is set via the new FILTER pin

▪ 5 µs output rise time in response to step input current

▪ 80 kHz bandwidth

▪ Total output error 1.5% at T

= 25°C

▪ Small footprint, low-profile SOIC8 package

▪ 1.2 mΩ 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

Fully Integrated, Hall Effect-Based Linear Current Sensor IC

with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor

Continued on the next page…

Approximate Scale 1:1

Package: 8 Lead SOIC (suffix LC)

Typical Application

TÜV America

Certificate Number:

U8V 06 05 54214 010

Summary of content (15 pages)

PAGE 1
ACS712 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor Features and Benefits ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Description Low-noise analog signal path Device bandwidth is set via the new FILTER pin 5 µs output rise time in response to step input current 80 kHz bandwidth Total output error 1.5% at TA = 25°C Small footprint, low-profile SOIC8 package 1.2 mΩ internal conductor resistance 2.
PAGE 2
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor ACS712 Description (continued) the device at up to 5× overcurrent conditions. The terminals of the conductive path are electrically isolated from the signal leads (pins 5 through 8). This allows the ACS712 to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.
PAGE 3
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.
PAGE 4
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor ACS712 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
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor ACS712 x05B PERFORMANCE CHARACTERISTICS1 TA = –40°C to 85°C, CF = 1 nF, and VCC = 5 V, unless otherwise specified Characteristic Optimized Accuracy Range Sensitivity Symbol Sens Noise VNOISE(PP) Zero Current Output Slope ∆VOUT(Q) Sensitivity Slope Total Output Error2 Test Conditions Min. Typ. Max.
PAGE 6
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor ACS712 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 10.5 10.4 10.3 10.2 10.1 -25 0 25 50 75 100 125 10.0 4.5 150 4.6 4.7 4.8 4.
PAGE 7
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor ACS712 Characteristic Performance IP = 20 A, unless otherwise specified 9.7 10.4 9.6 10.2 9.5 ICC (mA) Mean ICC (mA) Mean Supply Current versus Ambient Temperature VCC = 5 V 9.4 9.3 Supply Current versus Supply Voltage 10.0 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 8
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor ACS712 Characteristic Performance IP = 30 A, unless otherwise specified Mean Supply Current versus Ambient Temperature 9.6 10.2 9.5 10.0 ICC (mA) Mean ICC (mA) 9.4 VCC = 5 V 9.3 9.2 Supply Current versus Supply Voltage 9.8 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 4.6 4.7 4.8 4.9 TA (°C) 0 0.45 –0.5 0.40 –1.0 0.
PAGE 9
ACS712 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor Definitions of Accuracy Characteristics Sensitivity (Sens). The change in device 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 10
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor ACS712 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 11
ACS712 Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS 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 has a Chopper Stabilization technique that nearly eliminates Hall IC output drift induced by temperature or package stress effects.
PAGE 12
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor ACS712 Typical Applications +5 V +5 V VPEAK CBYP 0.1 µF 1 2 IP IP+ C2 0.1 µF VCC IP+ VIOUT ACS712 3 4 IP– FILTER IP– GND COUT 0.1 µF VOUT 8 7 6 RF 10 kΩ 5 R1 100 kΩ Q1 2N7002 1 + 2 U1 D1 LT1178 1N914 R3 330 kΩ R2 33 kΩ VRESET R4 10 kΩ – R1 1 MΩ CF 1 nF CBYP 0.1 µF IP IP+ VIOUT ACS712 3 4 C1 0.
PAGE 13
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor ACS712 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 device. Such a lowpass filter improves the signal-to-noise ratio, and therefore the resolution, of the device output signal.
PAGE 14
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor ACS712 Package LC, 8-pin SOIC 4.90 ±0.10 8° 0° 8 3.90 ±0.10 1 6.00 ±0.20 2 0.25 BSC 8X SEATING PLANE 0.10 C 0.51 0.31 1.27 BSC 5.60 1.04 REF 1 1.27 0.40 Branded Face C 1.27 1.75 0.25 0.17 A 8 0.65 C 2 PCB Layout Reference View SEATING PLANE GAUGE PLANE NNNNNNN TPP-AAA LLLLL 1.75 MAX 0.25 0.
PAGE 15
Fully Integrated, Hall Effect-Based Linear Current Sensor IC with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor ACS712 Revision History Revision Rev. 15 Revision Date Description of Revision November 16, 2012 Update rise time and isolation, IOUT reference data, patents Copyright ©2006-2013, Allegro MicroSystems, LLC The products described herein are protected by U.S. patents: 5,621,319; 7,598,601; and 7,709,754.