High-Accuracy, Hall-Effect-Based Current Sensor IC with
Common-Mode Field Rejection in High-Isolation SOIC16 Package
•
Differential Hall sensing rejects common-mode fields
•
Patented integrated digital temperature compensation
circuitry allows for near closed loop accuracy over
temperature in an open loop sensor
•
UL60950-1 (ed. 2) certified
□
Dielectric Strength Voltage = 4.8 kV
RMS
□
Basic Isolation Working Voltage = 1097 V
RMS
□
Reinforced Isolation Working Voltage = 565 V
RMS
•
Industry-leading noise performance with greatly improved
bandwidth through proprietary amplifier and filter design
techniques
•
Filter pin allows user to filter output for improved
resolution at lower bandwidth
• 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
•
4.5 to 5.5 V single supply operation
•
Output voltage proportional to AC or DC current
Continued on the next page…
FEATURES AND BENEFITS
DESCRIPTION
The Allegro
™
ACS724KMA 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
motor control, load detection and management, switched-mode
power supplies, and overcurrent fault protection.
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 the integrated Hall IC and converted into a proportional
voltage. The current is sensed differentially in order to reject
common-mode fields, improving accuracy in magnetically
noisy environments. The inherent device accuracy is optimized
through the close proximity of the 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 through 4, to pins 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.
The terminals of the conductive path are electrically isolated
from the sensor leads (pins 9 through 16). This allows the
ACS724KMA current sensor IC to be used in high-side current
sense applications without the use of high-side differential
amplifiers or other costly isolation techniques.
Continued on the next page…
pe d
Ty ste
te
TÜV America
Certificate Number:
U8V 14 11 54214 030
CB 14 11 54214 029
CB Certificate Number:
US-22339-A1-UL
Package: 16-pin SOICW (suffix MA)
Not to scale
+I
P
1
IP+
2
IP+
3
IP+
4
IP+
ACS724KMA
NC
GND
NC
16
15
14
13
12
11
10
9
C
BYPASS
0.1 µF
C
L
C
F
1 nF
I
P
5
IP–
6
IP–
7
IP–
8
IP–
FILTER
VIOUT
NC
VCC
NC
The ACS724KMA 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 FILTER pin can be used
to decrease the bandwidth in
order to optimize the noise
performance.
–I
P
Typical Application
ACS724KMA-DS, Rev. 8
MCO-0000217
June 22, 2018
ACS724KMA
High-Accuracy, Hall-Effect-Based Current Sensor IC with
Common-Mode Field Rejection in High-Isolation SOIC16 Package
•
Factory-trimmed sensitivity and quiescent output voltage for
improved accuracy
•
Chopper stabilization results in extremely stable quiescent
output voltage
•
Nearly zero magnetic hysteresis
•
Ratiometric output from supply voltage
FEATURES AND BENEFITS (continued)
The ACS724KMA is provided in a low-profile surface-mount
SOIC16 package. The leadframe is plated with 100% matte tin,
which is compatible with standard lead (Pb) free printed circuit board
assembly processes. Internally, the device is Pb-free. The device is
fully calibrated prior to shipment from the factory.
DESCRIPTION (continued)
SELECTION GUIDE
Part Number
ACS724KMATR-12AB-T
ACS724KMATR-20AB-T
ACS724KMATR-30AB-T
ACS724KMATR-30AU-T
ACS724KMATR-65AB-T
[1]
Contact Allegro
I
PR
(A)
±12
±20
±30
30
±65
Sens(Typ) at V
CC
= 5 V
(mV/A)
166
100
66
132
30.75
T
A
(°C)
Packing
[1]
–40 to 125
Tape and Reel, 1000 pieces per reel
for additional packing options.
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2
ACS724KMA
High-Accuracy, Hall-Effect-Based Current Sensor IC with
Common-Mode Field Rejection in High-Isolation SOIC16 Package
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Voltage
Reverse Output Voltage
Operating Ambient Temperature
Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
V
IOUT
V
RIOUT
T
A
T
J
(max)
T
stg
Range K
Notes
Rating
6
–0.1
V
CC
+ 0.5
–0.1
–40 to 125
165
–65 to 165
Units
V
V
V
V
°C
°C
°C
ISOLATION CHARACTERISTICS
Characteristic
Dielectric Surge Strength Test Voltage
Dielectric Strength Test Voltage
Symbol
V
SURGE
V
ISO
Notes
Tested ±5 pulses at 2/minute in compliance to IEC 61000-4-5
1.2 µs (rise) / 50 µs (width).
Agency type-tested for 60 seconds per UL 60950-1
(edition 2). Production tested at 3000 V
RMS
for 1 second, in
accordance with UL 60950-1 (edition 2).
Maximum approved working voltage for basic (single) isolation
according to UL 60950-1 (edition 2).
Maximum approved working voltage for reinforced isolation
according to UL 60950-1 (edition 2).
Minimum distance through air from IP leads to signal leads.
Minimum distance along package body from IP leads to signal
leads
Rating
10000
4800
1550
1097
800
565
7.5
8.2
Unit
V
V
RMS
V
PK
V
RMS
or VDC
V
PK
V
RMS
or VDC
mm
mm
Working Voltage for Basic Isolation
V
WVBI
Working Voltage for Reinforced Isolation
Clearance
Creepage
V
WVRI
D
cl
D
cr
THERMAL CHARACTERISTICS
Characteristic
Package Thermal Resistance
(Junction to Ambient)
Package Thermal Resistance
(Junction to Lead)
Symbol
R
θJA
Test Conditions*
Mounted on the Allegro 85-0738 evaluation board with 700 mm
2
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.
Mounted on the Allegro ASEK724 evaluation board.
Value
23
Units
°C/W
R
θJL
5
°C/W
*Additional thermal information available on the Allegro website.
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
3
ACS724KMA
High-Accuracy, Hall-Effect-Based Current Sensor IC with
Common-Mode Field Rejection in High-Isolation SOIC16 Package
V
CC
VCC
Master Current
Supply
To All Subcircuits
POR
Programming
Control
Hall
Current
Drive
IP+
IP+
IP+
IP+
Temperature
Sensor
EEPROM and
Control Logic
Offset
Control
C
BYPASS
0.1 µF
Sensitivity
Control
Dynamic Offset
Cancellation
IP–
IP–
IP–
IP–
GND
C
F
FILTER
Functional Block Diagram
IP+ 1
IP+ 2
IP+ 3
IP+ 4
IP-
IP-
IP-
IP-
5
6
7
8
16 NC
15 GND
14 NC
13 FILTER
12 VIOUT
11 NC
10 VCC
9 NC
Terminal List Table
Number
1, 2, 3, 4
5, 6, 7, 8
9, 16
10
11, 14
12
13
15
Name
IP+
IP-
NC
VCC
NC
VIOUT
FILTER
GND
Description
Terminals for current being sensed; fused internally
Terminals for current being sensed; fused internally
No internal connection; recommended to be left unconnected in order to
maintain high creepage
Device power supply terminal
No internal connection; recommened to connect to GND for the best ESD
performance
Analog output signal
Terminal for external capacitor that sets bandwidth
Signal ground terminal
Pinout Diagram
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
–
4
R
F(int)
+
–
+
VIOUT
ACS724KMA
High-Accuracy, Hall-Effect-Based Current Sensor IC with
Common-Mode Field Rejection in High-Isolation SOIC16 Package
COMMON ELECTRICAL CHARACTERISTICS
[1]:
Valid through the full range of T
A
= –40°C to 125°C and V
CC
= 5 V,
unless otherwise specified
Characteristic
Supply Voltage
Supply Current
Output Capacitance Load
Output Resistive Load
Primary Conductor Resistance
Internal Filter Resistance
[2]
Common Mode Field Rejection Ratio
Primary Hall Coupling Factor
Secondary Hall Coupling Factor
Hall Plate Sensitivity Matching
Hysteresis
Rise Time
Propagation Delay
Response Time
Internal Bandwidth
Noise Density
Noise
Nonlinearity
Sensitivity Ratiometry Coefficient
Zero-Current Output Ratiometry Coefficient
Saturation Voltage
[3]
Power-On Time
Shorted Output to Ground Current
Shorted Output to V
CC
Current
[1]
Symbol
V
CC
I
CC
C
L
R
L
R
IP
R
F(INT)
CMFRR
G1
G2
Sens
MATCH
I
HYS
t
r
t
pd
t
RESPONSE
BW
I
ND
I
N
E
LIN
SENS_RAT_
COEF
QVO_RAT_
COEF
V
OH
V
OL
t
PO
I
SC(GND)
I
SC(VCC)
Test Conditions
V
CC
within V
CC
(min) and V
CC
(max)
VIOUT to GND
VIOUT to GND
T
A
= 25°C
Uniform external magnetic field
T
A
= 25°C
T
A
= 25°C
T
A
= 25°C
Difference in offset after a ±40 A pulse
I
P
= I
P
(max), T
A
= 25°C, C
L
= 1 nF
I
P
= I
P
(max), T
A
= 25°C, C
L
= 1 nF
I
P
= I
P
(max), T
A
= 25°C, C
L
= 1 nF
Small signal –3 dB, C
L
= 1 nF
Input-referenced noise density;
T
A
= 25°C, C
L
= 1 nF
Input-referenced noise; C
F
= 4.7 nF,
C
L
= 1 nF, BW = 18 kHz, T
A
= 25°C
Through full range of I
P
V
CC
= 4.5 to 5.5 V, T
A
= 25°C
V
CC
= 4.5 to 5.5 V, T
A
= 25°C
R
L
= 4.7 kΩ, T
A
= 25°C
R
L
= 4.7 kΩ, T
A
= 25°C
Output reaches 90% of steady-state
level, T
A
= 25°C, I
P
= I
PR
(max) applied
T
A
= 25°C
T
A
= 25°C
Min.
4.5
–
–
4.7
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
V
CC
– 0.5
–
–
–
–
Typ.
5
10
–
–
0.85
1.7
40
4.5
0.5
±1
150
3
2
4
120
450
60
±1
1.3
1
–
–
80
3.3
45
Max.
5.5
14
10
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Units
V
mA
nF
kΩ
mΩ
kΩ
dB
G/A
G/A
%
mA
μs
μs
μs
kHz
µA
RMS
/
√Hz
mA
RMS
%
–
–
–
0.5
–
–
–
–
–
V
V
μs
mA
mA
Device 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.
[2]
R
F(INT)
forms an RC circuit via the FILTER pin.
[3]
The sensor IC will continue to respond to current beyond the range of I until the high or low saturation voltage; however, the nonlinearity in this region will be worse than
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