from current conductor to die due to high dV/dt voltage
transients
• 5 V, single supply operation
• Output voltage proportional to AC or DC current
• Factory-trimmed sensitivity and quiescent output voltage
for improved accuracy
• High PSRR for noisy environments
DESCRIPTION
The Allegro™ ACS730 current sensor family provides
economical and precise solutions for AC or DC current sensing
in industrial, commercial, and communications systems. The
device package allows for easy implementation by the customer.
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.
Device accuracy is optimized through the close proximity of the
magnetic field to the Hall transducer. A precise, proportional
voltage is provided by the Hall IC, which is programmed
for accuracy after packaging. 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
resistance of this conductive path is typically 1.2 mΩ, providing
low power loss.
The terminals of the conductive path are electrically isolated
from the sensor leads (pins 5 through 8). This allows the
ACS730 current sensor to be used in high-side current sense
applications without the use of high-side differential amplifiers
or other costly isolation techniques.
The ACS730 is provided in a small, low-profile surface-mount
SOIC8 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,
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.
PACKAGE: 8-Pin SOIC (suffix LC)
Not to scale
pe d
Ty ste
te
TÜV America
Certificate Number:
U8V 14 11 54214 032
CB 14 11 54214 031
CB Certificate Number:
US-22334-A2-UL
1
2
IP+
IP+
IP–
IP–
ACS730
VCC
8
7
6
5
C
BYPASS
0.1 µF
VIOUT
VZCR
GND
I
P
3
4
C
VZCR
1 nF
The ACS730 outputs an
analog signal, V
IOUT
, that
varies linearly with the
bidirectional AC or DC
primary sensed current,
I
P
, within the range speci-
fied.
Typical Application
ACS730-DS, Rev. 7
MCO-0000147
October 16, 2018
ACS730
SELECTION GUIDE
Part Number
ACS730KLCTR-20AB-T
ACS730KLCTR-30AB-T
ACS730KLCTR-30AU-T
ACS730KLCTR-40AB-T
ACS730KLCTR-40AU-T
ACS730KLCTR-50AB-T
ACS730KLCTR-65AB-T
ACS730KLCTR-80AU-T
[1]
[2]
1 MHz Bandwidth, Galvanically Isolated Current Sensor IC
in Small Footprint SOIC8 Package
Optimized
Range, I
P
(A)
±20
±30
30
±40
40
±50
±65
80
Sensitivity
[1]
,
Sens(Typ)
(mV/A)
100
66
120
50
100
40
30
50
T
A
(°C)
Packing
[2]
–40 to 125
Tape and reel, 3000 pieces per reel
Measured at V
CC
= 5 V.
Contact Allegro for additional packing options.
ABSOLUTE MAXIMUM RATINGS
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Voltage
Reverse Output Voltage
Zero Current Reference Voltage
Reverse Zero Current Reference Voltage
Operating Ambient Temperature
Junction Temperature
Storage Temperature
Symbol
V
CC
V
CC(R)
V
IOUT
V
IOUT(R)
V
ZCR
V
ZCR(R)
T
A
T
J
(max)
T
stg
Range K
Notes
Rating
6
–0.1
6
–0.1
20
–0.1
–40 to 125
165
–65 to 170
Units
V
V
V
V
V
V
°C
°C
°C
ISOLATION CHARACTERISTICS
Characteristic
Symbol
Notes
Agency type-tested for 60 seconds per UL standard
60950-1 (edition 2); production-tested at VISO for 1
second, in accordance with UL 60950-1 (edition 2).
Agency type-tested for 60 seconds per UL 1577 (edition 5);
production-tested at 2520 VRMS for 1 second, in
accordance with UL 1577 (edition 5).
Maximum approved working voltage for basic (single)
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
Value
2400
Units
V
RMS
Dielectric Strength Test Voltage
V
ISO
2100
420
297
3.9
3.9
V
RMS
V
PK
or VDC
V
RMS
mm
mm
Working Voltage for Basic Isolation
Clearance
Creepage
V
WVBI
D
cl
D
cr
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2
ACS730
THERMAL CHARACTERISTICS
Characteristic
Package Thermal Resistance
(Junction to Ambient)
Package Thermal Resistance
(Junction to Lead)
[1]
Additional
[2]
1 MHz Bandwidth, Galvanically Isolated Current Sensor IC
in Small Footprint SOIC8 Package
Symbol
Test Conditions
[1]
Mounted on the Allegro 85-xxxx evaluation board with
1500 mm
2
of 2 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.
[2]
Mounted on the Allegro ASEK730 evaluation board.
Value
Units
R
θJA
23
°C/W
R
θJL
5
°C/W
thermal information available on the Allegro website.
Further details on the board are available from the Frequently Asked Questions document on our website. Further information about board design and thermal perfor-
mance also can be found in the Applications Information section of this datasheet.
Pinout Diagram and Terminal List Table
Terminal List Table
IP+
IP+
IP–
IP–
1
2
3
4
8
7
6
5
VCC
VIOUT
VZCR
GND
Number
1, 2
3, 4
5
Name
IP+
IP–
GND
VZCR
VIOUT
VCC
Description
Terminals for current being sensed; fused internally
Terminals for current being sensed; fused internally
Signal ground terminal
Zero current reference; outputs a DC voltage equal to
V
IOUT
at I
P
= 0 A
Analog output signal
Device power supply terminal
Package LC, 8-Pin SOICN
Pinout Diagram
6
7
8
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
3
ACS730
1 MHz Bandwidth, Galvanically Isolated Current Sensor IC
in Small Footprint SOIC8 Package
Functional Block Diagram
VCC
To All Subcircuits
POR
Temp
Sensor
Hall
Voltage
Regulator
Programming
Control
Bandgap
Reference
EEPROM and Control Logic
IP+
IP+
Fine
Sensitivity
Control
Coarse
Sensitivity
Control
Offset Control
and VZCR
Generation
VZCR
VIOUT
IP–
IP–
GND
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
4
ACS730
1 MHz Bandwidth, Galvanically Isolated Current Sensor IC
in Small Footprint SOIC8 Package
COMMON ELECTRICAL CHARACTERISTICS
[1]
:
Valid over full range of T
A
, V
CC
= 5 V, unless otherwise specified
Characteristic
Supply Voltage
Supply Current
Power-On Time
Output Capacitance Load
Reference Capacitance Load
Output Resistive Load
Reference Resistive Load
Output High Saturation Voltage
[2]
Output Low Saturation Voltage
[2]
Primary Conductor Resistance
Magnetic Coupling Factor
Rise Time
Propagation Delay
Response Time
Internal Bandwidth
Noise Density
Noise
Power Supply Rejection Ratio
Sensitivity Power Supply Rejection Ratio
Offset Power Supply Rejection Ratio
Output Source Current
Output Sink Current
Zero Current Reference Voltage
Zero Current Reference Offset Voltage
Reference Source Current
Reference Sink Current
[1]
Device
Symbol
V
CC
I
CC
t
PO
C
L
C
VZCR
R
L
R
VZCR
V
OH
V
OL
R
IP
MCF
t
r
t
pd
t
RESPONSE
BW
I
ND
I
N
PSRR
SPSRR
OPSRR
I
OUT(src)
I
OUT(snk)
V
ZCR
V
ZCR(ofs)
I
VZCR(src)
I
VZCR(snk)
Test Conditions
V
CC
= 5 V, output open
T
A
= 25°C
VIOUT to GND
VZCR to GND
VIOUT to GND, VIOUT to VCC
VIOUT to GND, VZCR to VCC
VIOUT, T
A
= 25°C
VIOUT, T
A
= 25°C
T
A
= 25°C
T
A
= 25°C
T
A
= 25°C, C
L
= 0.47 nF, 1 V step on output
T
A
= 25°C, C
L
= 0.47 nF, 1 V step on output
T
A
= 25°C, C
L
= 0.47 nF, 1 V step on output
Small signal –3 dB; C
L
= 0.47 nF
Input-referenced noise density;
T
A
= 25°C, C
L
= 0.47 nF
Input-referenced noise;
T
A
= 25°C, C
L
= 0.47 nF
0 to 200 Hz, 100 mV pk-pk ripple on V
CC
,
I
P
= 0 A, VIOUT and VZCR
DC, V
CC
(min) < V
CC
< V
CC
(max),
I
P
= I
PR
(max)
DC, V
CC
(min) < V
CC
< V
CC
(max)
VIOUT shorted to GND
VIOUT shorted to VCC
T
A
= 25°C
T
A
= 25°C
T
A
= 25°C to 125°C
T
A
= –40°C to 25°C
VZCR shorted to GND
VZCR shored to VCC
Min.
4.5
–
–
–
–
10
10
V
CC
– 0.4
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–10
–20
–
–
–
Typ.
5
17
150
–
–
–
–
V
CC
– 0.3
0.1
1.2
10
0.6
0.2
0.7
1
40
40
35
15
30
5.5
3
2.5
±3
±10
±10
2
14
Max.
5.5
25
–
0.47
1
–
–
–
0.2
–
–
–
–
–
–
–
–
–
–
–
–
–
–
10
20
–
–
–
Unit
V
mA
μs
nF
nF
kΩ
kΩ
V
V
mΩ
G/A
μs
µs
μs
MHz
µA /
√(Hz)
mA
RMS
dB
dB
dB
mA
mA
V
mV
mV
mV
mA
mA
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]
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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