ACS722LLCTR-40AB-T2 [ALLEGRO]
High Accuracy, Galvanically Isolated Current Sensor IC With Small Footprint SOIC8 Package;
| 型号： | ACS722LLCTR-40AB-T2 |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | High Accuracy, Galvanically Isolated Current Sensor IC With Small Footprint SOIC8 Package |
| 文件： | 总22页 (文件大小：692K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ACS722
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
FEATURES AND BENEFITS
DESCRIPTION
• Patented integrated digital temperature compensation
circuitry allows for near closed loop accuracy over
temperature in an open loop sensor
TheAllegro™ ACS722 current sensor IC is an economical and
precise solution for AC or DC current sensing in industrial,
commercial, andcommunicationssystems.Thesmallpackage
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 = 2.4 kVrms
□ Basic Isolation Working Voltage = 420 Vpk/297
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
• 0.65 mΩ primary conductor resistance for low power
loss and high inrush current withstand capability
• Small footprint, low-profile SOIC8 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
primary copper conduction path (from pins 1 and 2, to pins 3
and 4), which is the path used for current sensing. The internal
resistanceofthisconductivepathis0.65mΩtypical,providing
low power loss.
• Integrated shield virtually eliminates capacitive coupling
from current conductor to die, greatly suppressing output
noise due to high dv/dt transients
• 3 to 3.6 V, single supply operation
Continued on the next page…
Package: 8-pin SOIC (suf ix LC)
The terminals of the conductive path are electrically isolated
from the sensor leads (pins 5 through 8). This allows the
ACS722currentsensorICtobeusedinhigh-sidecurrentsense
applicationswithouttheuseofhigh-sidedifferentialamplifiers
CB Certi icate Number: or other costly isolation techniques.
US-22334-A1-UL
TheACS722 is provided in a small, low profile surface mount
SOIC8 package. The leadframe is plated with 100% matte tin,
Continued on the next page…
Approximate Scale 1:1
8
7
1
The ACS722 outputs an analog
signal, VIOUT, that changes,
proportionally, with the
bidirectional AC or DC primary
sensed current, IP, within
IP+
VCC
+IP
ACS722
2
IP+
VIOUT
I
the specified measurement
range. The BW_SEL pin can
be used to select one of the
two bandwidths to optimize the
noise performance. Grounding
the BW_SEL pin puts the part
in the high bandwidth (80 kHz)
mode.
CBYPASS
0.1 µF
P
6
5
3
BW_SEL
GND
IP–
–IP
CL
4
IP–
Typical Application
ACS722-DS, Rev. 2
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
Features and Benefits (continued)
Description (continued)
• Output voltage proportional to AC or DC current
• Factory-trimmed sensitivity and quiescent output voltage for
improved accuracy
• Chopper stabilization results in extremely stable quiescent
output voltage
which is compatible with standard lead (Pb) free printed circuit
board assembly processes. Internally, the device is Pb-free, except
for flip-chip high-temperature Pb-based solder balls, currently
exempt from RoHS.The device is fully calibrated prior to shipment
from the factory.
• Nearly zero magnetic hysteresis
• Ratiometric output from supply voltage
Selection Guide
Sens(Typ)
Part Number
IPR (A)
at VCC = 3.3 V
TA (°C)
Packing1
(mV/A)
ACS722LLCTR-05AB-T2
ACS722LLCTR-10AU-T2
ACS722LLCTR-10AB-T2
ACS722LLCTR-20AU-T2
ACS722LLCTR-20AB-T2
ACS722LLCTR-40AU-T2
ACS722LLCTR-40AB-T2
±5
10
264
132
±10
20
-40 to 150
Tape and Reel, 3000 pieces per reel
±20
40
66
33
±40
1Contact Allegro for additional packing options.
2Variant not intended for automotive applications.
Allegro MicroSystems, LLC
115 Northeast Cutoff
2
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
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 L
–40 to 150
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 VISO for 1 second, in accordance
with UL 60950-1 (edition. 2).
Dielectric Strength Test Voltage
VISO
2400
VRMS
420
VPK or VDC
Maximum approved working voltage for basic (single)
isolation according UL 60950-1 (edition 2).
Working Voltage for Basic Isolation
VWVBI
297
3.9
VRMS
mm
Clearance
Creepage
Dcl
Dcr
Minimum distance through air from IP leads to signal leads.
Minimum distance along package body from IP leads to
signal leads.
3.9
mm
Thermal Characteristics
Characteristic
Symbol
Test Conditions*
Value
Units
Mounted on the Allegro 85-0593 evaluation board with 400 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
ºC/W
Package Thermal Resistance
(Junction to Lead)
RθJL
Mounted on the Allegro ASEK 722 evaluation board.
5
ºC/W
*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, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
VCC
Master Current
Supply
To All Subcircuits
POR
Programming
Control
Hall
Current
Drive
EEPROM and
Control Logic
Temperature
Sensor
Offset
Control
IP+
IP+
Sensitivity
Control
Tuned
Filter
VIOUT
IP–
IP–
BW_SEL
Functional Block Diagram
GND
Allegro MicroSystems, LLC
115 Northeast Cutoff
4
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
Pin-out Diagram and Terminal List
IP+ 1
8
7
6
5
VCC
IP+ 2
IP– 3
IP– 4
VIOUT
BW_SEL
GND
Pin-out Diagram
Terminal List Table
Number
Name
IP+
Description
1, 2
3, 4
5
Terminals for current being sensed; fused internally
Terminals for current being sensed; fused internally
Signal ground terminal
IP–
GND
6
BW_SEL Terminal for selecting 20 kHz or 80 kHz bandwidth
7
VIOUT
VCC
Analog output signal
8
Device power supply terminal
Allegro MicroSystems, LLC
115 Northeast Cutoff
5
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
COMMON ELECTRICAL CHARACTERISTICS1: valid through the full range of TA = –40°C to 150°C, and at VCC
=
3.3 V; unless otherwise speci ied
Characteristic
Symbol
VCC
ICC
Test Conditions
Min.
3
Typ.
3.3
9
Max.
3.6
12
10
–
Units
V
Supply Voltage
Supply Current
VCC within VCC(min) and VCC(max)
VIOUT to GND
–
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
0.65
10
–
mΩ
G/A
CF
–
–
IP = IP(max), TA = 25°C, CL = 1 nF,
BW_SEL tied to GND
–
–
–
–
–
–
–
–
–
–
4
17.5
1
–
–
–
–
–
–
–
–
–
–
–
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
150
42
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)
Input referenced noise; BWi = 20 kHz,
TA = 25°C, CL = 1 nF
–
–
21
±1
–
mA(rms)
Nonlinearity
ELIN
VOH
VOL
tPO
Through full range of IP
RL = 4.7 kΩ, TA = 25°C
RL = 4.7 kΩ, TA = 25°C
%
V
VCC
0.33
–
–
0.33
–
Saturation Voltage2
–
–
–
V
Output reaches 90% of steady-state
level, TA = 25°C, IP = IPR(max) applied
Power-On Time
64
μs
1Device may be operated at higher primary current levels, IP, ambient temperatures, TA, and internal leadframe temperatures, provided the Maximum Junction Tem-
perature, 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
6
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
xLLCTR-5AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA =
erwise speci ied
40°C to 150°C, VCC = 3.3 V, unless oth-
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
Characteristic
Nominal Performance
Current Sensing Range
Sensitivity
Symbol
Test Conditions
Min.
Typ.
Max.
Units
IPR
–5
–
–
5
–
A
Sens
IPR(min) < IP < IPR(max)
264
mV/A
VCC
0.5
x
Zero Current Output Voltage
VIOUT(Q)
Bidirectional; IP = 0 A
–
–
V
Accuracy Performance
TA = 25°C to 150°C; measured at IP = IPR(max)
TA = –40°C to 25°C; ; measured at IP = IPR(max)
IP = 0 A; TA = 25°C to 150°C
–2
–
–
±2.5
–
2
–
%
%
Sensitivity Error
Offset Voltage1
Total Output Error2
Esens
–15
–
15
–
mV
mV
%
VOE
IP = 0 A; TA = -40°C to 25°C
±20
–
IP = IPR(max), TA = 25°C to 150°C
IP = IPR(max), TA = –40°C to 25°C
–2.5
–
2.5
–
ETOT
±3
%
Lifetime Drift Characteristics
Sensitivity Error Lifetime Drift
Esens_drift
Etot_drift
–
–
±2
±2
–
–
%
%
Total Output Error Lifetime
Drift
1 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields.
2 Percentage of IP, with IP = IPR(max)
Allegro MicroSystems, LLC
115 Northeast Cutoff
7
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
xLLCTR-10AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA =
otherwise speci ied
40°C to 150°C, VCC = 3.3 V, unless
xLLCTR-10AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA =
otherwise speci ied
40°C to 150°C, VCC = 3.3 V, unless
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
Characteristic
Nominal Performance
Current Sensing Range
Sensitivity
Symbol
Test Conditions
Min.
Typ.
Max.
Units
IPR
0
–
–
10
–
A
Sens
IPR(min) < IP < IPR(max)
264
mV/A
VCC
0.1
x
Zero Current Output Voltage
VIOUT(Q)
Unidirectional; IP = 0 A
–
–
V
Accuracy Performance
TA = 25°C to 150°C; measured at IP = IPR(max)
TA = –40°C to 25°C; ; measured at IP = IPR(max)
IP = 0 A; TA = 25°C to 150°C
–2
–
–
±2.5
–
2
–
%
%
Sensitivity Error
Offset Voltage1
Total Output Error2
Esens
–15
–
15
–
mV
mV
%
VOE
IP = 0 A; TA = -40°C to 25°C
±20
–
IP = IPR(max), TA = 25°C to 150°C
IP = IPR(max), TA = –40°C to 25°C
–2.5
–
2.5
–
ETOT
±3
%
Lifetime Drift Characteristics
Sensitivity Error Lifetime Drift
Esens_drift
Etot_drift
–
–
±2
±2
–
–
%
%
Total Output Error Lifetime
Drift
1 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields.
2 Percentage of IP, with IP = IPR(max)
Characteristic
Nominal Performance
Current Sensing Range
Sensitivity
Symbol
Test Conditions
Min.
Typ.
Max.
Units
IPR
–10
–
–
10
–
A
Sens
IPR(min) < IP < IPR(max)
132
mV/A
VCC
0.5
x
Zero Current Output Voltage
VIOUT(Q)
Bidirectional; IP = 0 A
–
–
V
Accuracy Performance
TA = 25°C to 150°C; measured at IP = IPR(max)
TA = –40°C to 25°C; ; measured at IP = IPR(max)
IP = 0 A; TA = 25°C to 150°C
–1.5
–
–
±2
–
1.5
–
%
%
Sensitivity Error
Offset Voltage1
Total Output Error2
Esens
–10
–
10
–
mV
mV
%
VOE
IP = 0 A; TA = -40°C to 25°C
±15
–
IP = IPR(max), TA = 25°C to 150°C
IP = IPR(max), TA = –40°C to 25°C
–2
–
2
ETOT
±3
–
%
Lifetime Drift Characteristics
Sensitivity Error Lifetime Drift
Esens_drift
Etot_drift
–
–
±2
±2
–
–
%
%
Total Output Error Lifetime
Drift
1 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields.
2 Percentage of IP, with IP = IPR(max)
Allegro MicroSystems, LLC
115 Northeast Cutoff
8
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
xLLCTR-20AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA =
otherwise speci ied
40°C to 150°C, VCC = 3.3 V, unless
xLLCTR-20AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA =
otherwise speci ied
40°C to 150°C, VCC = 3.3 V, unless
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
Characteristic
Nominal Performance
Current Sensing Range
Sensitivity
Symbol
Test Conditions
Min.
Typ.
Max.
Units
IPR
0
–
–
20
–
A
Sens
IPR(min) < IP < IPR(max)
132
mV/A
VCC
0.1
x
Zero Current Output Voltage
VIOUT(Q)
Unidirectional; IP = 0 A
–
–
V
Accuracy Performance
TA = 25°C to 150°C; measured at IP = IPR(max)
TA = –40°C to 25°C; ; measured at IP = IPR(max)
IP = 0 A; TA = 25°C to 150°C
–1.5
–
–
±2
–
1.5
–
%
%
Sensitivity Error
Offset Voltage1
Total Output Error2
Esens
–10
–
10
–
mV
mV
%
VOE
IP = 0 A; TA = -40°C to 25°C
±15
–
IP = IPR(max), TA = 25°C to 150°C
IP = IPR(max), TA = –40°C to 25°C
–2
–
2
ETOT
±3
–
%
Lifetime Drift Characteristics
Sensitivity Error Lifetime Drift
Esens_drift
Etot_drift
–
–
±2
±2
–
–
%
%
Total Output Error Lifetime
Drift
1 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields.
2 Percentage of IP, with IP = IPR(max)
Characteristic
Nominal Performance
Current Sensing Range
Sensitivity
Symbol
Test Conditions
Min.
Typ.
Max.
Units
IPR
–20
–
–
20
–
A
Sens
IPR(min) < IP < IPR(max)
66
mV/A
VCC
0.5
x
Zero Current Output Voltage
VIOUT(Q)
Bidirectional; IP = 0 A
–
–
V
Accuracy Performance
TA = 25°C to 150°C; measured at IP = IPR(max)
TA = –40°C to 25°C; ; measured at IP = IPR(max)
IP = 0 A; TA = 25°C to 150°C
–1.5
–
–
±2
–
1.5
–
%
%
Sensitivity Error
Offset Voltage1
Total Output Error2
Esens
–10
–
10
–
mV
mV
%
VOE
IP = 0 A; TA = -40°C to 25°C
±15
–
IP = IPR(max), TA = 25°C to 150°C
IP = IPR(max), TA = –40°C to 25°C
–2
–
2
ETOT
±3
–
%
Lifetime Drift Characteristics
Sensitivity Error Lifetime Drift
Esens_drift
Etot_drift
–
–
±2
±2
–
–
%
%
Total Output Error Lifetime
Drift
1 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields.
2 Percentage of IP, with IP = IPR(max)
Allegro MicroSystems, LLC
115 Northeast Cutoff
9
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
xLLCTR-40AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA =
otherwise speci ied
40°C to 150°C, VCC = 3.3 V, unless
xLLCTR-40AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA =
otherwise speci ied
40°C to 150°C, VCC = 3.3 V, unless
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
Characteristic
Nominal Performance
Current Sensing Range
Sensitivity
Symbol
Test Conditions
Min.
Typ.
Max.
Units
IPR
0
–
–
40
–
A
Sens
IPR(min) < IP < IPR(max)
66
mV/A
VCC
0.1
x
Zero Current Output Voltage
VIOUT(Q)
Unidirectional; IP = 0 A
–
–
V
Accuracy Performance
TA = 25°C to 150°C; measured at IP = IPR(max)
TA = –40°C to 25°C; ; measured at IP = IPR(max)
IP = 0 A; TA = 25°C to 150°C
–1.5
–
–
±2
–
1.5
–
%
%
Sensitivity Error
Offset Voltage1
Total Output Error2
Esens
–10
–
10
–
mV
mV
%
VOE
IP = 0 A; TA = -40°C to 25°C
±15
–
IP = IPR(max), TA = 25°C to 150°C
IP = IPR(max), TA = –40°C to 25°C
–2
–
2
ETOT
±3
–
%
Lifetime Drift Characteristics
Sensitivity Error Lifetime Drift
Esens_drift
Etot_drift
–
–
±2
±2
–
–
%
%
Total Output Error Lifetime
Drift
1 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields.
2 Percentage of IP, with IP = IPR(max)
Characteristic
Nominal Performance
Current Sensing Range
Sensitivity
Symbol
Test Conditions
Min.
Typ.
Max.
Units
IPR
–40
–
–
40
–
A
Sens
IPR(min) < IP < IPR(max)
33
mV/A
VCC
0.5
x
Zero Current Output Voltage
VIOUT(Q)
Bidirectional; IP = 0 A
–
–
V
Accuracy Performance
TA = 25°C to 150°C; measured at IP = IPR(max)
TA = –40°C to 25°C; ; measured at IP = IPR(max)
IP = 0 A; TA = 25°C to 150°C
–1.5
–
–
±2
–
1.5
–
%
%
Sensitivity Error
Offset Voltage1
Total Output Error2
Esens
–10
–
10
–
mV
mV
%
VOE
IP = 0 A; TA = -40°C to 25°C
±15
–
IP = IPR(max), TA = 25°C to 150°C
IP = IPR(max), TA = –40°C to 25°C
–2
–
2
ETOT
±3
–
%
Lifetime Drift Characteristics
Sensitivity Error Lifetime Drift
Esens_drift
Etot_drift
–
–
±2
±2
–
–
%
%
Total Output Error Lifetime
Drift
1 Offset Voltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields.
2 Percentage of IP, with IP = IPR(max)
Allegro MicroSystems, LLC
115 Northeast Cutoff
10
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
CHARACTERISTIC PERFORMANCE
xLLCTR-5AB Key Parameters
Zero Current Output Voltage vs. Temperature
Offset Voltage vs. Temperature
1680
1670
1660
1650
1640
1630
1620
1610
1600
30
20
10
0
-10
-20
-30
-40
-50
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
274
272
270
268
266
264
262
260
258
4
3
2
1
0
-1
-2
-3
-4
0
50
100
-50
0
50
100
-50
Temperature (ºC)
Temperature (ºC)
Nonlinearity vs. Temperature
Total Error at IPR(max) vs. Temperature
1.00
0.80
0.60
0.40
0.20
0.00
-0.20
-0.40
-0.60
-0.80
-1.00
5
4
3
2
1
0
-1
-2
-3
-4
-5
0
50
100
-50
0
50
100
-50
Temperature (ºC)
Temperature (ºC)
+3 Sigma
Average
-3 Sigma
Allegro MicroSystems, LLC
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High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
xLLCTR-10AB Key Parameters
Zero Current Output Voltage vs. Temperature
Offset Voltage vs. Temperature
1660
10
5
1655
1650
1645
1640
1635
0
-5
-10
-15
0
50
100
150
150
150
-50
-50
-50
0
50
100
150
150
150
-50
-50
-50
Temperature (ºC)
Temperature (ºC)
Sensitivity Error vs. Temperature
Sensitivity vs. Temperature
137
136
135
134
133
132
131
130
129
4
3
2
1
0
-1
-2
-3
-4
0
50
100
0
50
100
Temperature (ºC)
Temperature (ºC)
Nonlinearity vs. Temperature
Total Error at IPR(max) vs. Temperature
1.00
0.80
0.60
0.40
0.20
0.00
-0.20
-0.40
-0.60
-0.80
-1.00
5
4
3
2
1
0
-1
-2
-3
-4
-5
0
50
100
0
50
100
Temperature (ºC)
Temperature (ºC)
+3 Sigma
Average
-3 Sigma
Allegro MicroSystems, LLC
115 Northeast Cutoff
12
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
xLLCTR-10AU Key Parameters
Offset Voltage vs. Temperature
Zero Current Output Voltage vs. Temperature
340
10
5
335
330
325
320
315
310
305
300
0
-5
-10
-15
-20
-25
-30
0
0
0
50
100
100
100
150
150
150
-50
-50
-50
-50
0
50
100
150
150
150
Temperature (ºC)
Temperature (ºC)
Sensitivity Error vs. Temperature
Sensitivity vs. Temperature
276
5
4
274
272
270
268
266
264
262
260
258
256
3
2
1
0
-1
-2
-3
-4
50
0
-50
50
100
Temperature (ºC)
Temperature (ºC)
Total Error at IPR(max) vs. Temperature
Nonlinearity vs. Temperature
1.00
0.80
0.60
0.40
0.20
0.00
-0.20
-0.40
-0.60
-0.80
-1.00
5
4
3
2
1
0
-1
-2
-3
-4
-5
50
0
-50
50
100
Temperature (ºC)
Temperature (ºC)
+3 Sigma
Average
-3 Sigma
Allegro MicroSystems, LLC
115 Northeast Cutoff
13
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
xLLCTR-20AB Key Parameters
Offset Voltage vs. Temperature
Zero Current Output Voltage vs. Temperature
1652
1652
1650
1648
1646
1644
1642
1640
1638
1636
1634
1650
1648
1646
1644
1642
1640
1638
1636
1634
0
50
100
100
100
150
150
150
-50
0
50
100
150
150
150
-50
Temperature (ºC)
Temperature (ºC)
Sensitivity Error vs. Temperature
Sensitivity vs. Temperature
69
69
68
68
67
5
4
3
2
1
67
66
66
65
65
0
-1
-2
-3
-4
0
50
0
50
100
-50
-50
Temperature (ºC)
Temperature (ºC)
Total Error at IPR(max) vs. Temperature
Nonlinearity vs. Temperature
1.00
0.80
0.60
0.40
0.20
0.00
-0.20
-0.40
-0.60
-0.80
-1.00
6
4
2
0
-2
-4
-6
0
50
0
50
100
-50
-50
Temperature (ºC)
Temperature (ºC)
+3 Sigma
Average
-3 Sigma
Allegro MicroSystems, LLC
115 Northeast Cutoff
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Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
xLLCTR-20AU Key Parameters
Offset Voltage vs. Temperature
Zero Current Output Voltage vs. Temperature
340
10
5
335
330
325
320
315
310
0
-5
-10
-15
-20
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
139
138
137
136
135
5
4
3
2
1
134
133
132
131
130
129
0
-1
-2
-3
-4
0
50
100
0
50
100
-50
-50
Temperature (ºC)
Temperature (ºC)
Total Error at IPR(max) vs. Temperature
Nonlinearity vs. Temperature
1.00
0.80
0.60
0.40
0.20
0.00
-0.20
-0.40
-0.60
-0.80
-1.00
5
4
3
2
1
0
-1
-2
-3
-4
-5
0
50
100
0
50
100
-50
-50
Temperature (ºC)
Temperature (ºC)
+3 Sigma
Average
-3 Sigma
Allegro MicroSystems, LLC
115 Northeast Cutoff
15
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
xLLCTR-40AB Key Parameters
Offset Voltage vs. Temperature
Zero Current Output Voltage vs. Temperature
1654
4
2
1652
1650
1648
1646
1644
1642
1640
1638
1636
1634
0
-2
-4
-6
-8
-10
-12
-14
-16
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
35
35
34
6
5
4
3
2
34
33
33
32
1
0
-1
-2
-3
-4
0
50
100
0
50
100
-50
-50
Temperature (ºC)
Temperature (ºC)
Total Error at IPR(max) vs. Temperature
Nonlinearity vs. Temperature
1.00
0.80
0.60
0.40
0.20
0.00
-0.20
-0.40
-0.60
-0.80
-1.00
5
4
3
2
1
0
-1
-2
-3
-4
-5
0
50
100
0
50
100
-50
-50
Temperature (ºC)
Temperature (ºC)
+3 Sigma
Average
-3 Sigma
Allegro MicroSystems, LLC
115 Northeast Cutoff
16
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
xLLCTR-40AU Key Parameters
Offset Voltage vs. Temperature
Zero Current Output Voltage vs. Temperature
345
15
10
5
340
335
330
325
320
315
310
0
-5
-10
-15
-20
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
69
69
68
68
67
5
4
3
2
1
67
66
66
65
65
0
-1
-2
-3
-4
0
50
100
0
50
100
-50
-50
Temperature (ºC)
Temperature (ºC)
Total Error at IPR(max) vs. Temperature
Nonlinearity vs. Temperature
1.00
0.80
0.60
0.40
0.20
0.00
-0.20
-0.40
-0.60
-0.80
-1.00
5
4
3
2
1
0
-1
-2
-3
-4
-5
0
50
100
0
50
100
-50
-50
Temperature (ºC)
Temperature (ºC)
+3 Sigma
Average
-3 Sigma
Allegro MicroSystems, LLC
115 Northeast Cutoff
17
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
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 circuit sensitivity (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
V
IOUT (IPR(max)) – VIOUT(Q)
Accuracy at
25°C Only
× 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
)
IOUT(Q)
0 A
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
=
3.3 V translates into VIOUT(Q) = 1.65 V. Variation in VIOUT(Q) can
be attributed to the resolution of the Allegro linear IC quiescent
voltage trim and thermal drift.
Figure 1: Output Voltage versus Sensed Current
+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 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 voltage
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
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1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
APPLICATION INFORMATION
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.
Impact of External Magnetic Fields
The ACS722 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:
For example, an external field of 1 Gauss will result in around
0.1 A of error. If the ACS722LLCTR-10AB, which has a nominal
sensitivity of 132 mV/A, is being used, that equates to 13.2 mV
of error on the output of the sensor.
Error (mV)
External Field
(Gauss)
Error (A)
5AB
13.2
26.4
52.8
10AB 20AB 40AB
B
Error(B) =
CF
0.5
1
0.05
0.1
6.6
3.3
6.6
1.65
3.3
13.2
26.4
2
0.2
13.2
6.6
where B is the strength of the external field perpendicular to the
Allegro MicroSystems, LLC
115 Northeast Cutoff
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Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS
V
Power-On Time (tPO)
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.
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
Rise Time (tr)
within ±10% of its steady state value
under an applied magnetic field
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. The rise time to a step response is used to derive the band-
width 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.
Figure 3: Power-On Time (tPO
)
Primary Current
(%)
90
V
IOUT
Propagation Delay (tpd)
Rise Time, t
r
The propagation delay is measured as the time interval 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.
20
10
0
t
Propagation Delay, t
pd
Figure 4: Rise Time (tr) and Propagation Delay (tpd
)
Response Time (tRESPONSE
)
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.
Primary Current
(%)
90
V
IOUT
Response Time, t
RESPONSE
0
t
Figure 5: Response Time (tRESPONSE
)
Allegro MicroSystems, LLC
115 Northeast Cutoff
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Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
Package Outline Drawing
For Reference Only – Not for Tooling Use
(Reference MS-012AA)
Dimensions in millimeters – NOT TO SCALE
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
8°
0°
4.90 0.10
1.27
0.65
8
8
1.75
0.25
0.17
5.60
6.00 0.20
3.90 0.10
A
1.04 REF
1
2
1
2
1.27
0.40
PCB Layout Reference View
C
0.25 BSC
Branded Face
SEATING PLANE
GAUGE PLANE
C
8X
SEATING
PLANE
1.75 MAX
0.10
C
NNNNNNN
TPP-AAA
LLLLL
0.51
0.31
0.25
0.10
1.27 BSC
1
B
Standard Branding Reference View
A
B
C
Terminal #1 mark area
N = Device part number
T = Device temperature range
P = Package Designator
A = Amperage
L = Lot number
Belly Brand = Country of Origin
Branding scale and appearance at supplier discretion
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
Figure 6: Package LC, 8-pin SOICN
Allegro MicroSystems, LLC
115 Northeast Cutoff
21
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
ACS722
Revision History
Revision
Revision Date
Description of Revision
–
1
2
June 10, 2014
October 29, 2014
April 29, 2015
Initial release.
Added Magnetic Coupling Factor characteristic and Error Due to External Magnetic Fields section
Added Characteristic Performance graphs
Copyright ©2011-2015, 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
22
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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