Allegro ACS712ELCTR-05B-T, ACS712ELCTR-20A-T, ACS712ELCTR-30A-T Schematics

ACS712

Fully Integrated, Hall Effect-Based Linear Current Sensor IC

with 2.1 kVRMS 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 = 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

TÜV America
Certificate Number:
U8V 06 05 54214 010

Package: 8 Lead SOIC (suffix LC)

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, switch­mode 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
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 m typical, providing low power
loss. The thickness of the copper conductor allows survival of

IOUT(Q)

)

Approximate Scale 1:1

Continued on the next page…

Typical Application

1

IP+

2

IP+

I

Application 1. The ACS712 outputs an analog signal, V
that varies linearly with the uni- or bi-directional AC or DC
primary sampled current, IP , within the range specified. CF
is recommended for noise management, with values that
depend on the application.

ACS712

P

3

FILTER

IP–

4

IP–

VCC

VIOUT

GND

8

7

6

5

V

C
1 nF

OUT

+5 V

C

BYP

0.1 μF

F

OUT

.

ACS712-DS, Rev. 15

ACS712

Fully Integrated, Hall Effect-Based Linear Current Sensor IC

with

2.1 kVRMS Isolation and a Low-Resistance Current Conductor

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.

The ACS712 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.

Selection Guide

Part Number Packing*

ACS712ELCTR-05B-T Tape and reel, 3000 pieces/reel –40 to 85 ±5 185

ACS712ELCTR-20A-T Tape and reel, 3000 pieces/reel –40 to 85 ±20 100

ACS712ELCTR-30A-T Tape and reel, 3000 pieces/reel –40 to 85 ±30 66

*Contact Allegro for additional packing options.

TA

(°C)

Optimized Range, I

(A)

Sensitivity, Sens

P

(Typ) (mV/A)

Absolute Maximum Ratings

Characteristic Symbol Notes Rating Units

Supply Voltage V

Reverse Supply Voltage V

Output Voltage V

Reverse Output Voltage V

Output Current Source I

Output Current Sink I

Overcurrent Transient Tolerance I

Nominal Operating Ambient Temperature T

Maximum Junction Temperature TJ(max) 165 ºC

Storage Temperature T

CC

RCC

IOUT

RIOUT

IOUT(Source)

IOUT(Sink)

P

A

stg

1 pulse, 100 ms 100 A

Range E –40 to 85 ºC

8V

–0.1 V

8V

–0.1 V

3mA

10 mA

–65 to 170 ºC

Isolation Characteristics

Characteristic Symbol Notes Rating Unit

Dielectric Strength Test Voltage* V

Working Voltage for Basic Isolation V

Working Voltage for Reinforced Isolation V

* Allegro does not conduct 60-second testing. It is done only during the UL certification process.

ISO

WFSI

WFRI

Agency type-tested for 60 seconds per
UL standard 60950-1, 1st Edition

For basic (single) isolation per UL standard
60950-1, 1st Edition

For reinforced (double) isolation per UL standard
60950-1, 1st Edition

Parameter Specification

CAN/CSA-C22.2 No. 60950-1-03

Fire and Electric Shock

UL 60950-1:2003

EN 60950-1:2001

2100 VAC

354 VDC or V

184 VDC or V

Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

pk

pk

2

ACS712

Fully Integrated, Hall Effect-Based Linear Current Sensor IC

with

2.1 kVRMS Isolation and a Low-Resistance Current Conductor

Functional Block Diagram

IP+

(Pin 1)

IP+

(Pin 2)

IP−

(Pin 3)

IP−

(Pin 4)

VCC

(Pin 8)

Hall Current

Drive

Sense Temperature

Coefficient Trim

Cancellation

Dynamic Offset

Sense

Trim

GND

(Pin 5)

Signal

Recovery

0 Ampere

Offset Adjust

Pin-out Diagram

R

F(INT)

FILTER

(Pin 6)

VIOUT
(Pin 7)

+5 V

IP+
IP+
IP–
IP–

1
2
3
4

8
7
6
5

VCC
VIOUT
FILTER
GND

Terminal List Table

Number Name Description

1 and 2 IP+ Terminals for current being sampled; fused internally

3 and 4 IP– Terminals for current being sampled; fused internally

5 GND Signal ground terminal

6 FILTER Terminal for external capacitor that sets bandwidth

7 VIOUT Analog output signal

8 VCC Device power supply terminal

Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

3

ACS712

Fully Integrated, Hall Effect-Based Linear Current Sensor IC

with

2.1 kVRMS Isolation and a Low-Resistance Current Conductor

COMMON OPERATING CHARACTERISTICS

1

over full range of TA , CF = 1 nF, and VCC = 5 V, unless otherwise specified

Characteristic Symbol Test Conditions Min. Typ. Max. Units

ELECTRICAL CHARACTERISTICS

Supply Voltage V
Supply Current I
Output Capacitance Load C
Output Resistive Load R
Primary Conductor Resistance R

PRIMARYTA

Rise Time t

CC

CC

LOAD

LOAD

r

VCC = 5.0 V, output open – 10 13 mA
VIOUT to GND – – 10 nF
VIOUT to GND 4.7 – – k

= 25°C – 1.2 – m

IP = IP(max), TA = 25°C, C

= open – 3.5 – s

OUT

4.5 5.0 5.5 V

Frequency Bandwidth f –3 dB, TA = 25°C; IP is 10 A peak-to-peak – 80 – kHz
Nonlinearity E
Symmetry E

Zero Current Output Voltage V

IOUT(Q)

Power-On Time t

Magnetic Coupling
Internal Filter Resistance

1

Device may be operated at higher primary current levels, IP, and ambient, TA , and internal leadframe temperatures, TA , provided that the Maximum

2

3

R

F(INT)

Over full range of I

LIN

Over full range of I

SYM

P

P

Bidirectional; IP = 0 A, TA = 25°C –

Output reaches 90% of steady-state level, TJ = 25°C, 20 A present

PO

on leadframe

– 1.5 – %

98 100 102 %

VCC ×

0.5

–V

–35–s

– 12 – G/A

1.7 k

Junction Temperature, TJ(max), is not exceeded.

2

1G = 0.1 mT.

3

R

F(INT)

forms an RC circuit via the FILTER pin.

COMMON THERMAL CHARACTERISTICS

1

Min. Typ. Max. Units

Operating Internal Leadframe Temperature TAE range –40 – 85 °C

Value Units

Junction-to-Lead Thermal Resistance

Junction-to-Ambient Thermal Resistance R

1

Additional thermal information is available on the Allegro website.

2

The Allegro 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 connect-

2

R

Mounted on the Allegro ASEK 712 evaluation board 5 °C/W

JL

Mounted on the Allegro 85-0322 evaluation board, includes the power con-

JA

sumed by the board

23 °C/W

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 Informa­tion section of this datasheet.

Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

4

ACS712

Fully Integrated, Hall Effect-Based Linear Current Sensor IC

with

2.1 kVRMS Isolation and a Low-Resistance Current Conductor

x05B PERFORMANCE CHARACTERISTICS1 T

= –40°C to 85°C, CF = 1 nF, and VCC = 5 V, unless otherwise specified

A

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Optimized Accuracy Range I

P

–5 – 5 A

Sensitivity Sens Over full range of IP, TA = 25°C 180 185 190 mV/A

Noise V

Zero Current Output Slope V

NOISE(PP)

OUT(Q)

Sensitivity Slope Sens

Total Output Error

1

Device may be operated at higher primary current levels, IP, and ambient temperatures, TA, provided that the Maximum Junction Temperature, T

2

E

is not exceeded.

2

Percentage of IP, with IP = 5 A. Output filtered.

x20A PERFORMANCE CHARACTERISTICS1 T

Peak-to-peak, TA = 25°C, 185 mV/A programmed Sensitivity,
CF = 47 nF, C

= open, 2 kHz bandwidth

OUT

–21– mV

TA = –40°C to 25°C – –0.26 – mV/°C
T

= 25°C to 150°C – –0.08 – mV/°C

A

TA = –40°C to 25°C – 0.054 – mV/A/°C
TA = 25°C to 150°C – –0.008 – mV/A/°C

TOTIP

=±5 A, TA = 25°C – ±1.5 – %

= –40°C to 85°C, CF = 1 nF, and VCC = 5 V, unless otherwise specified

A

J(max)

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Optimized Accuracy Range I

P

–20 – 20 A

Sensitivity Sens Over full range of IP, TA = 25°C 96 100 104 mV/A

Noise V

Zero Current Output Slope V

NOISE(PP)

OUT(Q)

Sensitivity Slope Sens

Total Output Error

1

Device may be operated at higher primary current levels, IP, and ambient temperatures, TA, provided that the Maximum Junction Temperature,

2

E

Peak-to-peak, TA = 25°C, 100 mV/A programmed Sensitivity,
CF = 47 nF, C

= open, 2 kHz bandwidth

OUT

–11– mV

TA = –40°C to 25°C – –0.34 – mV/°C
T

= 25°C to 150°C – –0.07 – mV/°C

A

TA = –40°C to 25°C – 0.017 – mV/A/°C
TA = 25°C to 150°C – –0.004 – mV/A/°C

TOTIP

=±20 A, TA = 25°C – ±1.5 – %

TJ(max), is not exceeded.

2

Percentage of IP, with IP = 20 A. Output filtered.

,

x30A PERFORMANCE CHARACTERISTICS1 T

= –40°C to 85°C, CF = 1 nF, and VCC = 5 V, unless otherwise specified

A

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Optimized Accuracy Range I

P

–30 – 30 A

Sensitivity Sens Over full range of IP , TA = 25°C 63 66 69 mV/A

Noise V

Zero Current Output Slope V

NOISE(PP)

OUT(Q)

Sensitivity Slope Sens

Total Output Error

1

Device may be operated at higher primary current levels, IP, and ambient temperatures, TA, provided that the Maximum Junction Temperature,

(max), is not exceeded.

T

J

2

Percentage of IP, with IP = 30 A. Output filtered.

2

E

Peak-to-peak, TA = 25°C, 66 mV/A programmed Sensitivity,
CF = 47 nF, C

= open, 2 kHz bandwidth

OUT

–7– mV

TA = –40°C to 25°C – –0.35 – mV/°C
TA = 25°C to 150°C – –0.08 – mV/°C

= –40°C to 25°C – 0.007 – mV/A/°C

T

A

T

= 25°C to 150°C – –0.002 – mV/A/°C

A

TOTIP

= ±30 A , TA = 25°C – ±1.5 – %

Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

5