ACS723KMATR-40AB-T_技术文档

ACS723KMA

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

DESCRIPTION

FEATURES AND BENEFITS

• Patented integrated digital temperature compensation

circuitry allows for near closed loop accuracy over

temperature in an open loop sensor

TheAllegro^™ACS723 current sensor IC is an economical and

precise solution for AC or DC current sensing in industrial,

commercial, and communication systems. The small package

is ideal for space constrained applications while also saving

costs due to reduced board area. Typical applications include

motorcontrol,loaddetectionandmanagement,switched-mode

power supplies, and overcurrent fault protection.

• UL60950-1 (ed. 2) certified

□ Dielectric Strength Voltage = 4.8 kVrms

□ Basic Isolation Working Voltage = 1097 Vrms

□ Reinforced Isolation Working Voltage = 565 Vrms

• Industry-leading noise performance with greatly improved

bandwidth through proprietary amplifier and filter

design techniques

• Pin-selectable band width: 80 kHz for high bandwidth

applications or 20 kHz for low noise performance

• 0.85 mΩ primary conductor resistance for low power loss

and high inrush current withstand capability

• Low-profile SOIC16 package suitable for space-

constrained applications

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

theintegratedHallICandconvertedintoaproportionalvoltage.

Deviceaccuracyisoptimizedthroughthecloseproximityofthe

magnetic field to the Hall transducer. A precise, proportional

voltage is provided by the low-offset, chopper-stabilized

BiCMOS Hall IC, which includes Allegro’s patented digital

temperature compensation, resulting in extremely accurate

performance over temperature. The output of the device has

a positive slope when an increasing current flows through the

primarycopperconductionpath(from pins 1through4, topins

5 through 8), which is the path used for current sensing. The

internal resistance of this conductive path is 0.85 mΩ typical,

providing low power loss.

• 4.5 to 5.5 V, single supply operation

• Output voltage proportional to AC or DC current

• Factory-trimmed sensitivity and quiescent output voltage

for improved accuracy

Continued on the next page…

TÜV America

Certificate Number:

U8V 14 11 54214 030

CB 14 11 54214 029

CB Certiﬁcate Number:

US-22339-A1-UL

The terminals of the conductive path are electrically isolated

from the sensor leads (pins 9 through 16). This allows the

ACS723currentsensorICtobeusedinhigh-sidecurrentsense

applicationswithouttheuseofhigh-sidedifferentialamplifiers

or other costly isolation techniques.

Package: 16-pin SOICW (suffix MA)

Continued on the next page…

Approximate Scale 1:1

16

ACS723

NC

GND

NC

1

2

3

The ACS723 outputs an

analog signal, V_IOUT, that

changes, proportionally, with

the bidirectional AC or DC

primary sensed current, I_P,

within the specified measure-

ment range. The BW_SEL pin

can be used to select one of

the two bandwidths to opti-

mize the noise performance.

Grounding the BW_SEL pin

puts the part in the high

IP+

15

+I_P

14

4

13

BW_SEL

VIOUT

NC

I_P

12

5

6

7

11

10

9

C_L

IP–

–I_P

VCC

8

C_BYPASS

bandwidth (80 kHz) mode.

0.1 mF

NC

Typical Application

ACS723-DS, Rev. 1

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

Features and Benefits (continued)

Description (continued)

• Chopper stabilization results in extremely stable quiescent

output voltage

• Nearly zero magnetic hysteresis

• Ratiometric output from supply voltage

The ACS723 is provided in a low profile surface mount SOIC16

package. The leadframe is plated with 100% matte tin, which is

compatiblewithstandardlead(Pb)freeprintedcircuitboardassembly

processes.Internally,thedeviceisPb-free,exceptforflip-chiphigh-

temperature Pb-based solder balls, currently exempt from RoHS.

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

Selection Guide

Sens(Typ) at V_CC= 5.0 V

Part Number

I_PR(A)

T_A(°C)

Packing¹

(mV/A)

ACS723KMATR-10AB-T

ACS723KMATR-20AB-T

ACS723KMATR-40AB-T

±10

±20

±40

200

-40 to 125

Tape and Reel, 3000 pieces per reel

100

50

¹Contact Allegro for additional packing options.

Allegro MicroSystems, LLC

115 Northeast Cutoff

2

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

SPECIFICATIONS

Absolute Maximum Ratings

Characteristic

Symbol

V_CC

Notes

Rating

6

Units

V

Supply Voltage

Reverse Supply Voltage

Output Voltage

V_RCC

–0.1

V

V_IOUT

V_RIOUT

T_A

25

V

Reverse Output Voltage

Operating Ambient Temperature

Junction Temperature

–0.1

V

Range K

–40 to 125

165

°C

T_J(max)

Storage Temperature

T_stg

–65 to 165

°C

Isolation Characteristics

Characteristic

Symbol

Notes

Rating

Unit

Agency type-tested for 60 seconds per UL 60950-1

(edition. 2). Production tested at 3000 V_RMSfor 1 second,

in accordance with UL 60950-1 (edition. 2).

Dielectric Strength Test Voltage

V_ISO

4800

V_RMS

1550

1097

800

V_PK

Maximum approved working voltage for basic (single)

isolation according UL 60950-1 (edition 2)

Working Voltage for Basic Isolation

V_WVBI

V_RMSor VDC

V_PK

Maximum approved working voltage for reinforced

isolation according to UL 60950-1 (edition 2)

Working Voltage for Reinforced Isolation

V_WVRI

565

V_RMSor VDC

Minimum distance through air from IP leads to signal

leads.

Clearance

Creepage

D_cl

D_cr

7.5

8.2

mm

Minimum distance along package body from IP leads to

signal leads

Thermal Characteristics

Characteristic

Symbol

Test Conditions*

Value Units

Mounted on the Allegro 85-0738 evaluation board with 700 mm²of 4 oz.

copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with

thermal vias connecting the layers. Performance values include the power

consumed by the PCB.

Package Thermal Resistance

(Junction to Ambient)

R_θJA

23

5

ºC/W

Package Thermal Resistance

(Junction to Lead)

R_θJL

Mounted on the Allegro ASEK 723 evaluation board.

*Additional thermal information available on the Allegro website.

Allegro MicroSystems, LLC

115 Northeast Cutoff

3

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

VCC

Master Current

Supply

To All Subcircuits

POR

Programming

Control

Hall

Current

Drive

EEPROM and

Control Logic

Temperature

Sensor

Offset

Control

IP+

Sensitivity

Control

Tuned

Filter

VIOUT

IP–

BW_SEL

GND

Functional Block Diagram

Terminal List Table

16 NC

IP+

IP-

1

2

3

4

5

6

7

8

Number

1, 2, 3, 4

5, 6, 7, 8

Name

Description

15 GND

14 NC

IP+

IP-

Terminals for current being sensed; fused internally

13 BW_SEL

12 VIOUT

11 NC

No internal connection; recommended to be left unconnected in order to

maintain high creepage.

9, 16

10

NC

VCC

NC

IP-

Device power supply terminal

IP-

10 VCC

No internal connection; recommened to connect to GND for the best ESD

performance

11, 14

IP-

9 NC

12

13

15

VIOUT

BW_SEL

GND

Analog output signal

Pin-out Diagram

Terminal for selecting 20 kHz or 80 kHz bandwidth

Signal ground terminal

Allegro MicroSystems, LLC

115 Northeast Cutoff

4

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

COMMON ELECTRICAL CHARACTERISTICS^1:valid through the full range of T_A= –40°C to 125°C, and at V_CC

=

5 V; unless otherwise speciﬁed

Characteristic

Supply Voltage

Symbol

V_CC

I_CC

Test Conditions

Min.

4.5

–

Typ.

5

Max.

5.5

14

10

–

Units

V

Supply Current

V_CCwithin V_CC(min) and V_CC(max)

VIOUT to GND

9

mA

nF

Output Capacitance Load

Output Resistive Load

Primary Conductor Resistance

Magnetic Coupling Factor

C_L

–

R_L

VIOUT to GND

4.7

–

kΩ

R_IP

T_A= 25°C

0.85

4.5

–

mΩ

G/A

C_F

–

I_P= I_P(max), T_A= 25°C, C_L= 1 nF,

BW_SEL tied to GND

–

4

17.5

2

–

μs

Rise Time

t_r

I_P= I_P(max), T_A= 25°C, C_L= 1 nF,

BW_SEL tied to VCC

I_P= I_P(max), T_A= 25°C, C_L= 1 nF,

BW_SEL tied to GND

μs

Propagation Delay

Response Time

t_pd

I_P= I_P(max), T_A= 25°C, C_L= 1 nF,

BW_SEL tied to VCC

5

μs

I_P= I_P(max), T_A= 25°C, C_L= 1 nF,

BW_SEL tied to GND

5

μs

t_RESPONSE

I_P= I_P(max), T_A= 25°C, C_L= 1 nF,

BW_SEL tied to VCC

22.5

80

20

220

62

31

μs

Small signal –3 dB; C_L= 1 nF,

BW_SEL tied to GND

kHz

Internal Bandwidth

Noise Density

Noise

BWi

I_ND

I_N

Small signal –3 dB; C_L= 1nF,

BW_SEL tied to VCC

Input referenced noise density;

T_A= 25°C, C_L= 1 nF

µA_(rms)/

√Hz

Input referenced noise; BWi = 80 kHz,

T_A= 25°C, C_L= 1 nF

mA_(rms)

Input referenced noise; BWi = 20 kHz,

T_A= 25°C, C_L= 1 nF

Nonlinearity

E_LIN

V_OH

V_OL

Through full range of I_P

R_L= 4.7 kΩ, T_A= 25°C

–

V_CC– 0.5

–

±1

–

%

V

–

Saturation Voltage²

–

0.5

V

Output reaches 90% of steady-state

level, T_A= 25°C, I_P= I_PR(max) applied

Power-On Time

t_PO

–

64

–

μs

¹Device may be operated at higher primary current levels, I_P, ambient temperatures, T_A, and internal leadframe temperatures, provided the Maximum Junction Tempera-

ture, T_J(max), is not exceeded.

²The sensor IC will continue to respond to current beyond the range of I_Puntil the high or low saturation voltage; however, the nonlinearity in this region will be worse than

through the rest of the measurement range.

Allegro MicroSystems, LLC

115 Northeast Cutoff

5

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

xKMATR-10AB PERFORMANCE CHARACTERISTICS: T_ARange K, valid at T_A= –ꢀ40°C to 125°C, V_CC= 5.0 V, unless

otherwise speciﬁed

Characteristic

Nominal Performance

Current Sensing Range

Sensitivity

Symbol

Test Conditions

Min.

Typ.¹

Max.

Units

I_PR

–10

–

10

–

A

Sens

I_PR(min)< I_P< I_PR(max)

200

mV/A

V_CC

0.5

x

Zero Current Output Voltage

V_IOUT(Q)

Bidirectional; I_P= 0 A

–

V

Accuracy Performance

I_P= I_PR(max), T_A= 25°C to 125°C

I_P= I_PR(max), T_A= –40°C to 25°C

–2.5

–

±1.4

±2

2.5

–

%

Total Output Error²

E_TOT

Total Output Error Components ³: E_TOT= E_SENS+ 100 × V_OE/(Sens × I_P)

T_A= 25°C to 125°C; measured at I_P= I_PR(max)

T_A= –40°C to 25°C; ; measured at I_P= I_PR(max)

I_P= 0 A; T_A= 25°C to 125°C

–2

–

±1.3

±1.8

±10

±20

2

–

%

Sensitivity Error

Offset Voltage⁴

E_SENS

–15

–

15

–

mV

V_OE

I_P= 0 A; T_A= -40°C to 25°C

Lifetime Drift Characteristics

Sensitivity Error Lifetime Drift

E_{sens_drift}

E_{tot_drift}

–

±1

–

%

Total Output Error Lifetime

Drift

¹Typical values with +/- are 3 sigma values.

²Percentage of I_P, with I_P= I_PR(max)

³A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output

error speciﬁcation. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section.

⁴Offset Voltage does not incorporate any error due to external magnetic ﬁelds. See section: Impact of External Magnetic Fields.

Allegro MicroSystems, LLC

115 Northeast Cutoff

6

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

xKMATR-20AB PERFORMANCE CHARACTERISTICS: T_ARange K, valid at T_A= –ꢀ40°C to 125°C, V_CC= 5.0 V, unless

otherwise speciﬁed

Characteristic

Nominal Performance

Current Sensing Range

Sensitivity

Symbol

Test Conditions

Min.

Typ.¹

Max.

Units

I_PR

–20

–

20

–

A

Sens

I_PR(min)< I_P< I_PR(max)

100

mV/A

V_CC

0.5

x

Zero Current Output Voltage

V_IOUT(Q)

Bidirectional; I_P= 0 A

–

V

Accuracy Performance

I_P= I_PR(max), T_A= 25°C to 125°C

I_P= I_PR(max), T_A= –40°C to 25°C

–2

–

±1.3

±2

2

–

%

Total Output Error²

E_TOT

Total Output Error Components ³: E_TOT= E_SENS+ 100 × V_OE/(Sens × I_P)

T_A= 25°C to 125°C; measured at I_P= I_PR(max)

T_A= –40°C to 25°C; ; measured at I_P= I_PR(max)

I_P= 0 A; T_A= 25°C to 125°C

–1.5

–

±1.2

±1.8

±5

1.5

–

%

Sensitivity Error

Offset Voltage⁴

E_SENS

–10

–

10

–

mV

V_OE

I

_P= 0 A; T_A= -40°C to 25°C

±12

Lifetime Drift Characteristics

Sensitivity Error Lifetime Drift

E_{sens_drift}

E_{tot_drift}

–

±1

–

%

Total Output Error Lifetime

Drift

¹Typical values with +/- are 3 sigma values.

²Percentage of I_P, with I_P= I_PR(max)

³A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output

error speciﬁcation. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section.

⁴Offset Voltage does not incorporate any error due to external magnetic ﬁelds. See section: Impact of External Magnetic Fields.

Allegro MicroSystems, LLC

115 Northeast Cutoff

7

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

xKMATR-40AB PERFORMANCE CHARACTERISTICS: T_ARange K, valid at T_A= –ꢀ40°C to 125°C, V_CC= 5.0 V, unless

otherwise speciﬁed

Characteristic

Nominal Performance

Current Sensing Range

Sensitivity

Symbol

Test Conditions

Min.

Typ.¹

Max.

Units

I_PR

–40

–

40

–

A

Sens

I_PR(min)< I_P< I_PR(max)

50

mV/A

V_CC

0.5

x

Zero Current Output Voltage

V_IOUT(Q)

Bidirectional; I_P= 0 A

–

V

Accuracy Performance

I_P= I_PR(max), T_A= 25°C to 125°C

I_P= I_PR(max), T_A= –40°C to 25°C

–2

–

±0.8

±1.8

2

–

%

Total Output Error²

E_TOT

Total Output Error Components ³: E_TOT= E_SENS+ 100 × V_OE/(Sens × I_P)

T_A= 25°C to 125°C; measured at I_P= I_PR(max)

T_A= –40°C to 25°C; ; measured at I_P= I_PR(max)

I_P= 0 A; T_A= 25°C to 125°C

–1.5

–

±0.8

±1.8

±4

1.5

–

%

Sensitivity Error

Offset Voltage⁴

E_SENS

–10

–

10

–

mV

V_OE

I

_P= 0 A; T_A= -40°C to 25°C

±6

Lifetime Drift Characteristics

Sensitivity Error Lifetime Drift

E_{sens_drift}

E_{tot_drift}

–

±1

–

%

Total Output Error Lifetime

Drift

¹Typical values with +/- are 3 sigma values.

²Percentage of I_P, with I_P= I_PR(max)

³A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output

error speciﬁcation. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section.

⁴Offset Voltage does not incorporate any error due to external magnetic ﬁelds. See section: Impact of External Magnetic Fields.

Allegro MicroSystems, LLC

115 Northeast Cutoff

8

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

CHARACTERISTIC PERFORMANCE

xKMATR-10AB Key Parameters

Zero Current Output Voltage vs. Temperature

Offset Voltage vs. Temperature

25

20

15

10

5

2525

2520

2515

2510

2505

2500

2495

2490

2485

2480

2475

0

-5

-10

-15

-20

-25

0

50

100

150

-50

0

50

100

150

-50

Temperature (ºC)

Sensitivity Error vs. Temperature

Sensitivity vs. Temperature

205

204

2.5

2.0

203

202

201

200

199

198

197

196

195

1.5

1.0

0.5

0.0

-0.5

-1.0

-1.5

-2.0

-2.5

0

50

100

-50

0

50

100

-50

Temperature (ºC)

Nonlinearity vs. Temperature

Total Error at I_PR(max)vs. Temperature

2.5

2.0

1.5

1.0

0.5

0.0

1.5

1.0

0.5

0.0

-0.5

-1.0

-1.5

-2.0

-2.5

-0.5

-1.0

-1.5

0

50

100

-50

0

50

100

-50

Temperature (ºC)

+3 Sigma

Average

-3 Sigma

Allegro MicroSystems, LLC

115 Northeast Cutoff

9

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

xKMATR-20AB Key Parameters

Zero Current Output Voltage vs. Temperature

Offset Voltage vs. Temperature

2520

2515

2510

2505

2500

2495

2490

2485

2480

20

15

10

5

0

-5

-10

-15

-20

-50

0

50

100

150

-50

0

50

100

150

Temperature (ºC)

Sensitivity Error vs. Temperature

Sensitivity vs. Temperature

103

2.5

2.0

1.5

102

101

100

99

1.0

0.5

0.0

-0.5

-1.0

-1.5

-2.0

-2.5

98

97

0

50

100

-50

0

50

100

-50

Temperature (ºC)

Nonlinearity vs. Temperature

Total Error at I_PR(max)vs. Temperature

3.0

1.0

0.8

2.0

1.0

0.6

0.4

0.2

0.0

-0.2

-0.4

-0.6

-0.8

-1.0

-2.0

-3.0

-50

0

50

100

-50

0

50

100

Temperature (ºC)

+3 Sigma

Average

-3 Sigma

Allegro MicroSystems, LLC

115 Northeast Cutoff

10

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

xKMATR-40AB Key Parameters

Zero Current Output Voltage vs. Temperature

Offset Voltage vs. Temperature

8

6

2508

2506

4

2504

2502

2500

2498

2496

2494

2492

2

0

-2

-4

-6

-8

0

50

100

150

-50

0

50

100

150

-50

Temperature (ºC)

Sensitivity Error vs. Temperature

Sensitivity vs. Temperature

51.5

2.5

2.0

51.0

50.5

50.0

49.5

49.0

48.5

1.5

1.0

0.5

0.0

-0.5

-1.0

-1.5

-2.0

-2.5

0

50

100

-50

0

50

100

-50

Temperature (ºC)

Nonlinearity vs. Temperature

Total Error at I_PR(max)vs. Temperature

2.5

0.5

2.0

1.5

0.4

0.3

1.0

0.2

0.5

0.1

0.0

-0.5

-1.0

-1.5

-2.0

-2.5

-0.1

-0.2

-0.3

-0.4

-0.5

0

50

100

-50

0

50

100

-50

Temperature (ºC)

+3 Sigma

Average

-3 Sigma

Allegro MicroSystems, LLC

115 Northeast Cutoff

11

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

DEFINITIONS OF ACCURACY CHARACTERISTICS

due to sensitivity error, and at relatively low currents, E_TOTwill

be mostly due to Offset Voltage (V_OE). In fact, at I_P= 0, E_TOT

approaches infinity due to the offset. This is illustrated in Figures

1 and 2. Figure 1 shows a distribution of output voltages versus I_P

at 25°C and across temperature. Figure 2 shows the correspond-

ing E_TOTversus I_P.

Sensitivity (Sens)

The change in sensor IC output in response to a 1A change

through the primary conductor. The sensitivity is the product

of the magnetic coupling factor (G/A) (1 G = 0.1 mT)and the

linear IC amplifier gain (mV/G). The linear IC amplifier gain is

programmed at the factory to optimize the sensitivity (mV/A) for

the full-scale current of the device.

Accuracy Across

Temperature

Increasing

V

(V)

IOUT

Nonlinearity (E_LIN

)

Accuracy at

25°C Only

The nonlinearity is a measure of how linear the output of the sen-

sor IC is over the full current measurement range. The nonlinear-

ity is calculated as:

Ideal V

IOUT

Accuracy Across

Temperature

Accuracy at

25°C Only

V

_IOUT(I_PR(max)) – V_IOUT(Q)

× 100 (%)

1–

E_LIN

=

{

[

[ {

2 × V_IOUT(I_PR(max)/2) – V_IOUT(Q)

I

(min)

PR

+I (A)

P

V

IOUT(Q)

where V_IOUT(I_PR(max)) is the output of the sensor IC with the

maximum measurement current flowing through it and

V_IOUT(I_PR(max)/2) is the output of the sensor IC with half of the

maximum measurement current flowing through it.

–I (A)

P

Full Scale I

P

I (max)

PR

Zero Current Output Voltage (V

)

0 A

IOUT(Q)

The output of the sensor when the primary current is zero. For

a unipolar supply voltage, it nominally remains at 0.5 × V_CCfor

a bidirectional device and 0.1 × V_CCfor a unidirectional device.

Accuracy at

25°C Only

Decreasing

(V)

V

Accuracy Across

Temperature

IOUT

For example, in the case of a bidirectional output device, V_CC

=

Figure 1: Output Voltage versus Sensed Current

5.0 V translates into V_IOUT(Q)= 2.50 V. Variation in V_IOUT(Q)can

be attributed to the resolution of the Allegro linear IC quiescent

voltage trim and thermal drift.

+E

TOT

Offset Voltage (V_OE)

The deviation of the device output from its ideal quiescent value

of 0.5 × V_CC(bidirectional) or 0.1 × V_CC(unidirectional) due to

nonmagnetic causes. To convert this voltage to amperes, divide

by the device sensitivity, Sens.

Across Temperature

25°C Only

Total Output Error (E_TOT

)

The the difference between the current measurement from the

sensor IC and the actual current (I_P), relative to the actual current.

This is equivalent to the difference between the ideal output volt-

age and the actual output voltage, divided by the ideal sensitivity,

relative to the current flowing through the primary conduction

path:

–I

P

+I

P

V

_{IOUT_ideal}(I_P) – V_IOUT(I_P)

E_TOT(I_P) =

× 100 (%)

–E

TOT

Sens_ideal(I_P)

× I_P

The Total Output Error incorporates all sources of error and is a

function of I_P. At relatively high currents, E_TOTwill be mostly

Figure 2: Total Output Error versus Sensed Current

Allegro MicroSystems, LLC

115 Northeast Cutoff

12

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

APPLICATION INFORMATION

±3 sigma value for Total Error (E_TOT) as a function of the sensed

current (I_P) is estimated as:

Impact of External Magnetic Fields

The ACS723 works by sensing the magnetic field created by the

current flowing through the package. However, the sensor cannot

differentiate between fields created by the current flow and exter-

nal magnetic fields. This means that external magnetic fields can

cause errors in the output of the sensor. Magnetic fields which are

perpendicular to the surface of the package affect the output of

the sensor, as it only senses fields in that one plane. The error in

Amperes can be quantified as:

2

100 × V_OE

(_{Sens × I})

2

E_TOT(I_P) = E_SENS

+

P

Here, E_SENSand V_OEare the ±3 sigma values for those error

terms. If there is an average sensitivity error or average offset

voltage, then the average Total Error is estimated as:

100 × V_OE

AVG

E_TOT(I_P) = E_SENS

+

AVG

B

Error(B) =

C_F

Sens × I_P

The resulting total error will be a sum of E_TOTand E_{TOT_AVG}

.

where B is the strength of the external field perpendicular to the

surface of the package in Gauss, and C_Fis the coupling factor in

G/A. Then, multiplying by the sensitivity of the part (Sens) gives

the error in mV.

Using these equations and the 3 sigma distributions for Sensitiv-

ity Error and Offset Voltage, the Total Error vs. sensed current

(I_P) is below for the ACS723KMATR-40AB. As expected, as one

goes towards zero current, the error in percent goes towards infin-

ity due to division by zero (refer to Figure 3).

For example, an external field of 1 Gauss will result in around

0.22 A of error. If the ACS723KMATR-10AB, which has a nomi-

nal sensitivity of 200 mV/A, is being used, that equates to 44 mV

of error on the output of the sensor.

15.00

10.00

Table 1: External Magnetic Field (Gauss) Impact

-40C+3sig

Error (mV)

5.00

External Field

-40C-3sig

Error (A)

(Gauss)

10AB

22

20AB

11

40AB

6

25C+3sig

0.00

25C-3sig

0.5

1

0.11

0.22

0.44

125C+3sig

44

22

11

-5.00

125C-3sig

2

88

44

22

-10.00

-15.00

Estimating Total Error vs. Sensed Current

The Performance Characteristics tables give distribution (±3

sigma) values for Total Error at I_PR(max); however, one often

wants to know what error to expect at a particular current. This

can be estimated by using the distribution data for the compo-

nents of Total Error, Sensitivity Error and Offset Voltage. The

30

0

5

10

15

20

25

35

40

Current (A)

Figure 3: Predicted Total Error as a Function of Sensed

Current for the ACS723KMATR-40AB

Allegro MicroSystems, LLC

115 Northeast Cutoff

13

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS

Power-On Time (t_PO)

V

CC

V

(typ.)

CC

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.

V

IOUT

90% V

IOUT

Power-On Time (t_PO) is defined as the time it takes for the output

voltage to settle within ±10% of its steady state value under an

applied magnetic field, after the power supply has reached its

minimum specified operating voltage (V_CC(min)) as shown in the

chart at right (refer to Figure 4).

V

CC

(min.)

t

PO

t

1

2

t = time at which power supply reaches

1

minimum specified operating voltage

t = time at which output voltage settles

2

within ±10% of its steady state value

under an applied magnetic field

Rise Time (t_r)

The time interval between: a) when the sensor IC reaches 10%

of its full scale value; and b) when it reaches 90% of its full scale

value (refer to Figure 5). The rise time to a step response is used

to derive the bandwidth of the current sensor IC, in which ƒ(–3

dB) = 0.35/t_r. Both t_rand t_RESPONSEare detrimentally affected by

eddy current losses observed in the conductive IC ground plane.

0

t

Figure 4: Power-On Time

Primary Current

(%)

90

V

IOUT

Propagation Delay (t_pd)

Rise Time, t

r

The propagation delay is measured as the time interval between:

a) when the primary current signal reaches 20% of its final value;

and b) when the device reaches 20% of its output corresponding

to the applied current (refer to Figure 5).

20

10

0

t

Propagation Delay, t

pd

Response Time (t_RESPONSE

)

Figure 5: Rise Time and Propagation Delay

The time interval between: a) when the primary current signal

reaches 90% of its final value; and b) when the device reaches

90% of its output corresponding to the applied current (refer to

Figure 6).

Primary Current

(%)

90

V

IOUT

Response Time, t

RESPONSE

0

t

Figure 6: Response Time

Allegro MicroSystems, LLC

115 Northeast Cutoff

14

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

NOT TO SCALE

All dimensions in millimeters.

15.75

9.54

1.27

0.65

Package Outline

Slot in PCB to maintain >8 mm creepage

once part is on PCB

2.25

7.25

1.27

3.56

17.27

Current

In

Current

Out

Perimeter holes for stitching to the other,

matching current trace design, layers of

the PCB for enhanced thermal capability.

21.51

Figure 7: High-Isolation PCB Layout

Allegro MicroSystems, LLC

115 Northeast Cutoff

15

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

PACKAGE OUTLINE DRAWING

For Reference Only – Not for Tooling Use

(Reference MS-013AA)

NOT TO SCALE

Dimensions in millimeters

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

Exact case and lead conﬁguration at supplier discretion within limits shown

8°

10.30 0.20

0°

16

0.33

0.20

7.50 0.10

10.30 0.33

A

1.27

0.40

1.40 REF

1

2

Branded Face

0.25 BSC

SEATING PLANE

16X

CC

GAUGE PLANE

2.65 MAX

0.10

C

SEATING

PLANE

0.30

0.10

1.27 BSC

0.51

0.31

1.27

0.65

16

NNNNNNN

LLLLLLLL

2.25

1

B

Standard Branding Reference View

L

9.50

N = Device part number

= Assembly Lot Number, first eight characters

A

Terminal #1 mark area

B

C

Branding scale and appearance at supplier discretion

1

2

Reference land pattern layout (reference IPC7351 SOIC127P600X175-8M);

all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary

to meet application process requirements and PCB layout tolerances

C

PCB Layout Reference View

Figure 8: Package MA, 16-pin SOICW

Allegro MicroSystems, LLC

115 Northeast Cutoff

16

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

1.508.853.5000; www.allegromicro.com

High Accuracy, Hall-effect Based Current Sensor

IC in High Isolation SOIC16 Package

ACS723KMA

Document Revision History

Revision

Date

February 23, 2015 Initial release

Change

–

1

April 13, 2016

Corrected Package Outline Drawing branding information (page 16).

Allegro MicroSystems, LLC reserves the right to make, from time to time, such departures from the detail specifications as may be required to

permit improvements in the performance, 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 any devices or systems, including but not limited to life support devices or systems, in which a failure of

Allegro’s product can reasonably be expected to cause bodily harm.

The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its

use; nor for any infringement 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

Allegro MicroSystems, LLC

115 Northeast Cutoff

17

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

1.508.853.5000; www.allegromicro.com


型号：	ACS723KMATR-40AB-T
厂家：	ALLEGRO MICROSYSTEMS
描述：	Analog Circuit, 信息通信管理光电二极管
文件：	总17页 (文件大小：579K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ACS723KMATR-40AB-T [ALLEGRO]

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