ACS754LCB-100-PSF - Allegro Microsystems

ACS754xCB-100

Description

The Allegro ACS75x family of current sensors provides

economical and precise solutions for current sensing in

industrial, automotive, commercial, and communications

systems. The device package allows for easy implementation by

the customer. Typical applications include motor control, load

detection and management, power supplies, and overcurrent

fault protection.

The device consists of a precision, low-offset linear Hall sensor

circuit with a copper conduction path located near 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 at the factory.

The output of the device has a positive slope (>VCC

/ 2) when an

increasing current flows through the primary copper conduction

path (from terminal 4 to terminal 5), which is the path used for

current sensing. The internal resistance of this conductive path

is typically 100 μΩ, providing low power loss. The thickness

of the copper conductor allows survival of the device at up to

ACS754100-DS Rev. 4

Features and Benefits

▪ Monolithic Hall IC for high reliability

▪ Single +5 V supply

▪ 3 kVRMS isolation voltage between terminals 4/5 and

pins 1/2/3 for up to 1 minute

▪ 35 kHz bandwidth

▪ Automotive temperature range

▪ End-of-line factory-trimmed for gain and offset

▪ Ultra-low power loss: 100 μΩ internal conductor

resistance

▪ Ratiometric output from supply voltage

▪ Extremely stable output offset voltage

▪ Small package size, with easy mounting capability

▪ Output proportional to AC and DC currents

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

Continued on the next page…

Package: 5 pin module (leadform PFF)

Typical Application

+5 V

VOU

CBYP

0.1 µF

IP+

IP–

GND

ACS754

VIOUT

VCC

Application 1. The ACS754 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 application.

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS754xCB-100

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

5× overcurrent conditions. The terminals of the conductive path are

electrically isolated from the sensor leads (pins 1 through 3). This

allows the ACS75x family of sensors to be used in applications

requiring electrical isolation without the use of opto-isolators or

other costly isolation techniques.

The device is fully calibrated prior to shipment from the factory.

The ACS75x family is lead (Pb) free. All pins are coated with

100% matte tin, and there is no lead inside the package. The

heavy gauge leadframe is made of oxygen-free copper.

Description (continued)

Absolute Maximum Ratings

Characteristic Symbol Notes Rating Units

Supply Voltage VCC 16 V

Reverse Supply Voltage VRCC –16 V

Output Voltage VIOUT 16 V

Reverse Output Voltage VRIOUT –0.1 V

Maximum Basic Isolation Voltage VISO 353 VAC, 500 VDC, or Vpk V

Maximum Rated Input Current IIN 200 A

Output Current Source IOUT(Source) 3mA

Output Current Sink IOUT(Sink) 10 mA

Nominal Operating Ambient Temperature TA

Range L –40 to 150 ºC

Range S –20 to 85 ºC

Maximum Junction TJ(max) 165 ºC

Storage Temperature Tstg –65 to 170 ºC

TÜV America

Certificate Number:

U8V 04 11 54214 001

Fire and Electric Shock

EN60950-1:2001

Selection Guide

Part Number TOP

(°C)

Primary Sensed

Current, IP

(A)

Sensitivity

Sens (Typ.)

(mV/A)

Package Packing1

Terminals Signal Pins

ACS754LCB-100-PFF –40 to 150 ±100 20 Formed Formed

Bulk, 170 pieces/bagACS754LCB-100-PSF2–40 to 150 ±100 20 Straight Formed

ACS754SCB-100-PFF2–20 to 85 ±100 20 Formed Formed

1Contact Allegro for additional packing options.

2Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently

restricted to existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future

is probable. Samples are no longer available. Status change: April 28, 2008.

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS754xCB-100

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

IP+

IP–

VIOUT

GND

VCC

Terminal List Table

Number Name Description

1 VCC Device power supply pin

2 GND Signal ground pin

3 VIOUT Analog output signal pin

4 IP+ Terminal for current being sensed

5 IP– Terminal for current being sensed

Functional Block Diagram

Pin-out Diagram

Amp Out

VCC

+5 V

VIOUT

GND

Filter

Dynamic Offset

Cancellation

0.1 μF

IP–

IP+

Gain Temperature

Coefficient Offset

Voltage

Regulator

Trim Control

To all subcircuits

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS754xCB-100

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

ELECTRICAL CHARACTERISTICS, over operating ambient temperature range unless otherwise stated

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Primary Sensed Current IP–100 – 100 A

Supply Voltage VCC 4.5 5.0 5.5 V

Supply Current ICC VCC = 5.0 V, output open 6.5 8 10 mA

Output Resistance ROUT IOUT = 1.2 mA – 1 2 Ω

Output Capacitance Load CLOAD VOUT to GND – – 10 nF

Output Resistive Load RLOAD VOUT to GND 4.7 – – kΩ

Primary Conductor Resistance RPRIMARY IP = ±100A; TA = 25°C – 100 – μΩ

Isolation Voltage VISO Pins 1-3 and 4-5; 60 Hz, 1 minute 3.0 – – kV

PERFORMANCE CHARACTERISTICS, -20°C to +85°C, VCC = 5 V unless otherwise specified

Propagation time tPROP IP = ±50 A, TA = 25°C – 4 – μs

Response time tRESPONSE IP = ±50 A, TA = 25°C – 11 – μs

Rise time trIP = ±50 A, TA = 25°C – 10 – μs

Frequency Bandwidth f –3 dB , TA = 25°C – 35 – kHz

Sensitivity Sens Over full range of IP

, TA = 25°C – 20 – mV/A

Over full range of IP 19.0 – 21.2 mV/A

Noise VNOISE Peak-to-peak, TA = 25°C,

no external filter –45 –mV

Linearity ELIN Over full range of IP – – ±0.8 %

Symmetry ESYM Over full range of IP 98 100 102 %

Zero Current Output Voltage VOUT(Q) I = 0 A, TA = 25°C – VCC / 2 – V

Electrical Offset Voltage

(Magnetic error not included) VOE

I = 0 A, TA = 25°C –10 – 10 mV

I = 0 A –20 – 20 mV

Magnetic Offset Error IERROM I = 0 A, after excursion of 100 A – ±0.1 ±0.30 A

Total Output Error

(Including all offsets) ETOT

Over full range of IP

, TA = 25°C – ±0.9 – %

Over full range of IP – – ±5.0 %

PERFORMANCE CHARACTERISTICS, -40°C to +150°C, VCC = 5 V unless otherwise specified

Propagation time tPROP IP = ±50 A, TA = 25°C – 4 – μs

Response time tRESPONSE IP = ±50 A, TA = 25°C – 11 – μs

Rise time trIP = ±50 A, TA = 25°C – 10 – μs

Frequency Bandwidth f –3 dB , TA = 25°C – 35 – kHz

Sensitivity Sens Over full range of IP

, TA = 25°C – 20 – mV/A

Over full range of IP 18.0 – 21.5 mV/A

Noise VNOISE Peak-to-peak, TA = 25°C,

no external filter –45 –mV

Linearity ELIN Over full range of IP – – ±1.5 %

Symmetry ESYM Over full range of IP 98 100 102 %

Zero Current Output Voltage VOUT(Q) I = 0 A, TA = 25°C – VCC / 2 – V

Electrical Offset Voltage

(Magnetic error not included) VOE

I = 0 A, TA = 25°C –10 – 10 mV

I = 0 A –35 – 35 mV

Magnetic Offset Error IERROM I = 0 A, after excursion of 100 A – ±0.1 ±0.55 A

Total Output Error

(Including all offsets) ETOT

Over full range of IP

, TA = 25°C – ±1.0 – %

Over full range of IP – – ±9.2 %

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS754xCB-100

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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 pro-

grammed 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:

where

∆ gain = the gain variation as a function of temperature

changes from 25ºC,

% sat = the percentage of saturation of the flux concentra-

tor, which becomes significant as the current being sensed

approaches full-scale ±IP , and

VIOUT_full-scale amperes = the output voltage (V) when the sensed

current approximates full-scale ±IP .

Symmetry (ESYM). The degree to which the absolute voltage

output from the sensor varies in proportion to either a positive

or negative full-scale primary current. The following equation is

used to derive symmetry:

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 VOUT(Q) can be attributed to the res-

olution of the Allegro linear IC quiescent voltage trim, magnetic

hysteresis, and thermal drift.

Electrical offset voltage (VOE). The deviation of the device out-

put from its ideal quiescent value of VCC ⁄ 2 due to nonmagnetic

causes.

Magnetic offset error (IERROM). The magnetic offset is due to

the residual magnetism (remnant field) of the core material. The

magnetic offset error is highest when the magnetic circuit has

been saturated, usually when the device has been subjected to a

full-scale or high-current overload condition. The magnetic offset

is largely dependent on the material used as a flux concentrator.

The larger magnetic offsets are observed at the lower operating

temperatures.

Accuracy (ETOT). The accuracy represents the maximum devia-

tion 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 on the following page.

Accuracy is divided into four areas:

• 0 A at 25°C. Accuracy of sensing zero current flow at 25°C,

without the effects of temperature.

• 0 A over Δ temperature. Accuracy of sensing zero current

flow including temperature effects.

• Full-scale current at 25°C. Accuracy of sensing the full-scale

current at 25°C, without the effects of temperature.

• Full-scale current over Δ temperature. Accuracy of sensing full-

scale current flow including temperature effects.

Definitions of Accuracy Characteristics

100 1–

[{

VIOUT_full-scale amperes – VIOUT(Q)

Δ gain × % sat ( )

2 (VIOUT_half-scale amperes – VIOUT(Q) )

100

VIOUT_+ full-scale amperes – VIOUT(Q)

VIOUT(Q) – VIOUT_–full-scale amperes



Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS754xCB-100

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Definitions of Dynamic Response Characteristics

Propagation delay (tPROP). The time required for the sensor

output to reflect a change in the primary current signal. Propaga-

tion delay is attributed to inductive loading within the linear IC

package, as well as in the inductive loop formed by the primary

conductor geometry. Propagation delay can be considered as a

fixed time offset and may be compensated.

Primary Current

Transducer Output

I (%)

Propagation Time, tPROP

Primary Current

Transducer Output

I (%)

Response Time, tRESPONSE t

Primary Current

Transducer Output

I (%)

Rise Time, trt

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 ƒ(–3 dB) =

0.35 / tr. Both tr and tRESPONSE are detrimentally affected by eddy

current losses observed in the conductive IC ground plane.

Response time (tRESPONSE). The time interval between

a) when the primary current signal reaches 90% of its final

value, and b) when the sensor reaches 90% of its output

corresponding to the applied current.

Output Voltage versus Sensed Current

Accuracy at 0 A and at Full-Scale Current

Increasing VIOUT(V)

+IP (A)

Accuracy

25°C Only

Accuracy

25°C Only

Accuracy

25°C Only

Accuracy

0 A

vrOe$Temperature

Average

VIOUT

–IP (A)

vrOe$Temperature

Decreasing VIOUT(V)

IP(min)

IP(max)

Full Scale

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS754xCB-100

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Step Response

No external filter, TA=25°C

x100 Device

Output (mV)

100 A

Excitation

Signal

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS754xCB-100

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

ACS754

RCBPPP

YYWWA

ACS Allegro Current Sensor

754 Device family number

ROperating ambient temperature range code

CB Package type designator

PPP Primary sensed current

YY Date code: Calendar year (last two digits)

WW Date code: Calendar week

ADate code: Shift code

ACS754

RCBPPP

L...L

YYWW

ACS Allegro Current Sensor

754 Device family number

ROperating ambient temperature range code

CB Package type designator

PPP Primary sensed current

L...L Lot code

YY Date code: Calendar year (last two digits)

WW Date code: Calendar week

Package Branding

Two alternative patterns are used

4.157

R1 .039

1.91 .075

3.118

21.4 .843

0.5 .020

R3 .118

0.8 .031

1.5 .059

0.5 .020

R2 .079

Perimeter through-holes recommended

Straight terminal leadform (PSF)

Recommended PCB Layout View

Formed Leadforms (PFF, PSF)

1º

5º

14.00

13.00

4.40

2.90

10.00

7.00

3.50

0.50

1.90

17.50

23.50

4.00

3.00

1.50

2.75

3.18

0.381

Dambar removal intrusion

All dimensions nominal, not for tooling use

Dimensions in millimeters

Exact configuration at supplier discretion within limits shown

Package CB, 5-pin module, leadform PFF unless otherwise noted

Creepage distance, current terminals to sensor pins: 7.25 mm

Clearance distance, current terminals to sensor pins: 7.25 mm

Package mass: 4.63 g typical

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 de par tures from the detail spec i fi ca tions as may be required to per-

mit improvements in the per for mance, 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 in for ma tion in clud ed herein is believed to be ac cu rate and reliable. How ev er, Allegro MicroSystems, Inc. assumes no re spon si bil i ty for its use;

nor for any in fringe ment of patents or other rights of third parties which may result from its use.

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