ACS723KMATR-20AB-T [ALLEGRO]
Analog Circuit,;型号: | ACS723KMATR-20AB-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 |
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, VIOUT, that
changes, proportionally, with
the bidirectional AC or DC
primary sensed current, IP,
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+
IP+
IP+
IP+
15
+IP
14
4
13
BW_SEL
VIOUT
NC
IP
12
5
6
7
11
10
9
CL
IP–
IP–
IP–
IP–
–IP
VCC
8
CBYPASS
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 VCC = 5.0 V
Part Number
IPR (A)
TA (°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
VCC
Notes
Rating
6
Units
V
Supply Voltage
Reverse Supply Voltage
Output Voltage
VRCC
–0.1
V
VIOUT
VRIOUT
TA
25
V
Reverse Output Voltage
Operating Ambient Temperature
Junction Temperature
–0.1
V
Range K
–40 to 125
165
°C
°C
TJ(max)
Storage Temperature
Tstg
–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 VRMS for 1 second,
in accordance with UL 60950-1 (edition. 2).
Dielectric Strength Test Voltage
VISO
4800
VRMS
1550
1097
800
VPK
Maximum approved working voltage for basic (single)
isolation according UL 60950-1 (edition 2)
Working Voltage for Basic Isolation
VWVBI
VRMS or VDC
VPK
Maximum approved working voltage for reinforced
isolation according to UL 60950-1 (edition 2)
Working Voltage for Reinforced Isolation
VWVRI
565
VRMS or VDC
Minimum distance through air from IP leads to signal
leads.
Clearance
Creepage
Dcl
Dcr
7.5
8.2
mm
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 mm2 of 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)
RθJA
23
5
ºC/W
ºC/W
Package Thermal Resistance
(Junction to Lead)
RθJL
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+
IP+
IP+
IP+
Sensitivity
Control
Tuned
Filter
VIOUT
IP–
IP–
IP–
IP–
BW_SEL
GND
Functional Block Diagram
Terminal List Table
16 NC
IP+
IP+
IP+
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
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 CHARACTERISTICS1: valid through the full range of TA = –40°C to 125°C, and at VCC
=
5 V; unless otherwise specified
Characteristic
Supply Voltage
Symbol
VCC
ICC
Test Conditions
Min.
4.5
–
Typ.
5
Max.
5.5
14
10
–
Units
V
Supply Current
VCC within VCC(min) and VCC(max)
VIOUT to GND
9
mA
nF
Output Capacitance Load
Output Resistive Load
Primary Conductor Resistance
Magnetic Coupling Factor
CL
–
–
RL
VIOUT to GND
4.7
–
–
kΩ
RIP
TA = 25°C
0.85
4.5
–
mΩ
G/A
CF
–
–
IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to GND
–
–
–
–
–
–
–
–
–
–
–
4
17.5
2
–
–
–
–
–
–
–
–
–
–
–
μs
μs
Rise Time
tr
IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to VCC
IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to GND
μs
Propagation Delay
Response Time
tpd
IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to VCC
5
μs
IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to GND
5
μs
tRESPONSE
IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to VCC
22.5
80
20
220
62
31
μs
Small signal –3 dB; CL = 1 nF,
BW_SEL tied to GND
kHz
kHz
Internal Bandwidth
Noise Density
Noise
BWi
IND
IN
Small signal –3 dB; CL = 1nF,
BW_SEL tied to VCC
Input referenced noise density;
TA = 25°C, CL = 1 nF
µA(rms)/
√Hz
Input referenced noise; BWi = 80 kHz,
TA = 25°C, CL = 1 nF
mA(rms)
mA(rms)
Input referenced noise; BWi = 20 kHz,
TA = 25°C, CL = 1 nF
Nonlinearity
ELIN
VOH
VOL
Through full range of IP
RL = 4.7 kΩ, TA = 25°C
RL = 4.7 kΩ, TA = 25°C
–
VCC – 0.5
–
±1
–
%
V
–
Saturation Voltage2
–
0.5
V
Output reaches 90% of steady-state
level, TA = 25°C, IP = IPR(max) applied
Power-On Time
tPO
–
64
–
μs
1Device may be operated at higher primary current levels, IP, ambient temperatures, TA, and internal leadframe temperatures, provided the Maximum Junction Tempera-
ture, TJ(max), is not exceeded.
2The sensor IC will continue to respond to current beyond the range of IP until 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: TA Range K, valid at TA = –ꢀ40°C to 125°C, VCC = 5.0 V, unless
otherwise specified
Characteristic
Nominal Performance
Current Sensing Range
Sensitivity
Symbol
Test Conditions
Min.
Typ.1
Max.
Units
IPR
–10
–
–
10
–
A
Sens
IPR(min) < IP < IPR(max)
200
mV/A
VCC
0.5
x
Zero Current Output Voltage
VIOUT(Q)
Bidirectional; IP = 0 A
–
–
V
Accuracy Performance
IP = IPR(max), TA = 25°C to 125°C
IP = IPR(max), TA = –40°C to 25°C
–2.5
–
±1.4
±2
2.5
–
%
%
Total Output Error2
ETOT
Total Output Error Components 3: ETOT = ESENS + 100 × VOE/(Sens × IP)
TA = 25°C to 125°C; measured at IP = IPR(max)
TA = –40°C to 25°C; ; measured at IP = IPR(max)
IP = 0 A; TA = 25°C to 125°C
–2
–
±1.3
±1.8
±10
±20
2
–
%
%
Sensitivity Error
Offset Voltage4
ESENS
–15
–
15
–
mV
mV
VOE
IP = 0 A; TA = -40°C to 25°C
Lifetime Drift Characteristics
Sensitivity Error Lifetime Drift
Esens_drift
Etot_drift
–
–
±1
±1
–
–
%
%
Total Output Error Lifetime
Drift
1 Typical values with +/- are 3 sigma values.
2 Percentage of IP, with IP = IPR(max)
3 A 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.
4 Offset 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: TA Range K, valid at TA = –ꢀ40°C to 125°C, VCC = 5.0 V, unless
otherwise specified
Characteristic
Nominal Performance
Current Sensing Range
Sensitivity
Symbol
Test Conditions
Min.
Typ.1
Max.
Units
IPR
–20
–
–
20
–
A
Sens
IPR(min) < IP < IPR(max)
100
mV/A
VCC
0.5
x
Zero Current Output Voltage
VIOUT(Q)
Bidirectional; IP = 0 A
–
–
V
Accuracy Performance
IP = IPR(max), TA = 25°C to 125°C
IP = IPR(max), TA = –40°C to 25°C
–2
–
±1.3
±2
2
–
%
%
Total Output Error2
ETOT
Total Output Error Components 3: ETOT = ESENS + 100 × VOE/(Sens × IP)
TA = 25°C to 125°C; measured at IP = IPR(max)
TA = –40°C to 25°C; ; measured at IP = IPR(max)
IP = 0 A; TA = 25°C to 125°C
–1.5
–
±1.2
±1.8
±5
1.5
–
%
%
Sensitivity Error
Offset Voltage4
ESENS
–10
–
10
–
mV
mV
VOE
I
P = 0 A; TA = -40°C to 25°C
±12
Lifetime Drift Characteristics
Sensitivity Error Lifetime Drift
Esens_drift
Etot_drift
–
–
±1
±1
–
–
%
%
Total Output Error Lifetime
Drift
1 Typical values with +/- are 3 sigma values.
2 Percentage of IP, with IP = IPR(max)
3 A 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.
4 Offset 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: TA Range K, valid at TA = –ꢀ40°C to 125°C, VCC = 5.0 V, unless
otherwise specified
Characteristic
Nominal Performance
Current Sensing Range
Sensitivity
Symbol
Test Conditions
Min.
Typ.1
Max.
Units
IPR
–40
–
–
40
–
A
Sens
IPR(min) < IP < IPR(max)
50
mV/A
VCC
0.5
x
Zero Current Output Voltage
VIOUT(Q)
Bidirectional; IP = 0 A
–
–
V
Accuracy Performance
IP = IPR(max), TA = 25°C to 125°C
IP = IPR(max), TA = –40°C to 25°C
–2
–
±0.8
±1.8
2
–
%
%
Total Output Error2
ETOT
Total Output Error Components 3: ETOT = ESENS + 100 × VOE/(Sens × IP)
TA = 25°C to 125°C; measured at IP = IPR(max)
TA = –40°C to 25°C; ; measured at IP = IPR(max)
IP = 0 A; TA = 25°C to 125°C
–1.5
–
±0.8
±1.8
±4
1.5
–
%
%
Sensitivity Error
Offset Voltage4
ESENS
–10
–
10
–
mV
mV
VOE
I
P = 0 A; TA = -40°C to 25°C
±6
Lifetime Drift Characteristics
Sensitivity Error Lifetime Drift
Esens_drift
Etot_drift
–
–
±1
±1
–
–
%
%
Total Output Error Lifetime
Drift
1 Typical values with +/- are 3 sigma values.
2 Percentage of IP, with IP = IPR(max)
3 A 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.
4 Offset 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
150
150
-50
0
50
100
150
150
150
-50
Temperature (ºC)
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)
Temperature (ºC)
Nonlinearity vs. Temperature
Total Error at IPR(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)
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
150
150
-50
0
50
100
150
150
150
Temperature (ºC)
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)
Temperature (ºC)
Nonlinearity vs. Temperature
Total Error at IPR(max) vs. Temperature
3.0
1.0
0.8
2.0
1.0
0.6
0.4
0.2
0.0
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.0
-2.0
-3.0
-50
0
50
100
-50
0
50
100
Temperature (ºC)
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
150
150
-50
0
50
100
150
150
150
-50
Temperature (ºC)
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)
Temperature (ºC)
Nonlinearity vs. Temperature
Total Error at IPR(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
0.0
-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)
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, ETOT will
be mostly due to Offset Voltage (VOE). In fact, at IP = 0, ETOT
approaches infinity due to the offset. This is illustrated in Figures
1 and 2. Figure 1 shows a distribution of output voltages versus IP
at 25°C and across temperature. Figure 2 shows the correspond-
ing ETOT versus IP.
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 (ELIN
)
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 (IPR(max)) – VIOUT(Q)
× 100 (%)
1–
ELIN
=
[ {
2 × VIOUT (IPR(max)/2) – VIOUT(Q)
I
(min)
PR
+I (A)
P
V
IOUT(Q)
where VIOUT(IPR(max)) is the output of the sensor IC with the
maximum measurement current flowing through it and
VIOUT(IPR(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 × VCC for
a bidirectional device and 0.1 × VCC for 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, VCC
=
Figure 1: Output Voltage versus Sensed Current
5.0 V translates into VIOUT(Q) = 2.50 V. Variation in VIOUT(Q) can
be attributed to the resolution of the Allegro linear IC quiescent
voltage trim and thermal drift.
+E
TOT
Offset Voltage (VOE)
The deviation of the device output from its ideal quiescent value
of 0.5 × VCC (bidirectional) or 0.1 × VCC (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 (ETOT
)
The the difference between the current measurement from the
sensor IC and the actual current (IP), 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(IP) – VIOUT(IP)
ETOT(IP) =
× 100 (%)
–E
TOT
Sensideal(IP)
× IP
The Total Output Error incorporates all sources of error and is a
function of IP. At relatively high currents, ETOT will 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 (ETOT) as a function of the sensed
current (IP) 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 × VOE
(Sens × I )
2
ETOT(IP) = ESENS
+
P
Here, ESENS and VOE are 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 × VOE
AVG
ETOT (IP) = ESENS
+
AVG
AVG
B
Error(B) =
CF
Sens × IP
The resulting total error will be a sum of ETOT and ETOT_AVG
.
where B is the strength of the external field perpendicular to the
surface of the package in Gauss, and CF is 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
(IP) 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 IPR(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 (tPO)
V
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 (tPO) 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 (VCC(min)) as shown in the
chart at right (refer to Figure 4).
V
CC
(min.)
t
PO
t
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 (tr)
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/tr. Both tr and tRESPONSE are 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 (tpd)
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 (tRESPONSE
)
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).
Copyright ©2011-2016, Allegro MicroSystems, LLC
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
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