ACS755SCB-130-PSF - Allegro Microsystems

ACS755xCB-130

Description

The Allegro ACS755 family of current sensors provides

economical and precise solutions for DC 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 will be valid when a 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 100 μΩ typical,

providing low power loss.

ACS755130-DS Rev. 7

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 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

ACS755

VIOUT

VCC

Application 1. The ACS755 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.

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS755xCB-130

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

The thickness of the copper conductor allows survival of the device

at up to 5× overcurrent conditions. The terminals of the conductive

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

This allows the ACS755 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 leads are plated with

100% matte tin, and there is no Pb 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)

Bandwidth

(kHz)

Package Packing1

Terminals Signal Pins

ACS755LCB-130-PFF –40 to 150 130 30 35 Formed Formed

170 pieces per bulk bag

ACS755LCB-130-PSF2–40 to 150 130 30 35 Straight Formed

ACS755SCB-130-PFF3–20 to 85 130 30 35 Formed Formed

ACS755SCB-130-PSF3–20 to 85 130 30 35 Straight 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.

2Variant is in production but has been determined to be LAST TIME BUY. This classification indicates that the variant is obsolete and notice has been

given. Sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications

because of obsolescence in the near future. Samples are no longer available. Status date change November 1, 2008. Deadline for receipt of LAST

TIME BUY orders is May 1, 2008.

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS755xCB-130

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

ACS755xCB-130

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 IP0 – 130 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 – 10 – 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 – 30 – mV/A

Over full range of IP 27.5 – 32.5 mV/A

Noise VNOISE Peak-to-peak, TA = 25°C,

no external filter –55 –mV

Linearity ELIN Over full range of IP – – ±0.85 %

Zero Current Output Voltage VOUT(Q) I = 0 A, TA = 25°C – 0.6 – V

Electrical Offset Voltage

(Magnetic error not included) VOE

I = 0 A, TA = 25°C –15 – 15 mV

I = 0 A –25 – 25 mV

Magnetic Offset Error IERROM I = 0 A, after excursion of 130 A – ±0.1 ±0.30 A

Total Output Error

(Including all offsets) ETOT

Over full range of IP

, TA = 25°C – ±1.0 – %

Over full range of IP – – ±7.0 %

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 – 10 – 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 – 30 – mV/A

Over full range of IP 27.5 – 32.5 mV/A

Noise VNOISE Peak-to-peak, TA = 25°C,

no external filter –55 –mV

Linearity ELIN Over full range of IP – – ±0.85 %

Zero Current Output Voltage VOUT(Q) I = 0 A, TA = 25°C – 0.6 – V

Electrical Offset Voltage

(Magnetic error not included) VOE

I = 0 A, TA = 25°C –15 – 15 mV

I = 0 A –50 – 50 mV

Magnetic Offset Error IERROM I = 0 A, after excursion of 130 A – ±0.1 ±0.30 A

Total Output Error

(Including all offsets) ETOT

Over full range of IP

, TA = 25°C – ±1.0 – %

Over full range of IP – – ±8.0 %

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS755xCB-130

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

VIOUT_¼ full-scale IP (V) is the output voltage when the sensed

current approximates 0.25  IP(max), and

VIOUT_¾ full-scale IP (V) is the output voltage when the sensed

current approximates 0.75  IP(max).

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 0.6. 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 out-

put from its ideal quiescent value 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 –

IOUT_3/4 full-scale IP – V

IOUT(Q)

IOUT_1/4 full-scale IP – V

IOUT(Q)



Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS755xCB-130

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

0 A

vrOe $Temperature

Average

VIOUT

–IP (A)

vrOe $Temperature

Decreasing VIOUT

(V)

IP(max)

Full Scale

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS755xCB-130

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Step Response

50 A Excitation Signal, TA=25°C

x130 Device

Output (mV)

Excitation

Signal

Fully Integrated, Hall Ef fect-Based Linear Current Sensor

with High Voltage Isolation and a Low-Resistance Current Conductor

ACS755xCB-130

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

The products described herein are manufactured under one or more of the following U.S. patents: 5,619,137; 5,621,319; 6,781,359; 7,075,287;

7,166,807; 7,265,531; 7,425,821; or 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.

For the latest version of this document, visit our website:

www.allegromicro.com

Package CB, 5-pin module

Leadform PFF

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

1.91

321.4

0.5

0.8

1.5

0.5

Perimeter through-holes recommended

1º±2°

5º±5°

14.0±0.2

17.5±0.2

4.0±0.2

3.0±0.2

2.9±0.2

3.5±0.2

10.00±0.10

13.00±0.10

0.51±0.10

4.40±0.10

7.00±0.10

1.9±0.2

1.50±0.10

Branding scale and appearance at supplier discretion

Dambar removal intrusion

For Reference Only; not for tooling use (reference DWG-9111, DWG-9110)

Dimensions in millimeters

Dimensions exclusive of mold flash, gate burrs, and dambar protrusions

Exact case and lead configuration at supplier discretion within limits shown

Standard Branding Reference View

N = Device part number

T = Temperature code

A = Amperage range

L = Lot number

Y = Last two digits of year of manufacture

W = Week of manufacture

= Supplier emblem

Branded

Face

0.381+0.060

–0.030

NNNNNNN

TTT - AAA

LLLLLLL

YYWW

PCB Layout Reference View