ACS723 Datasheet PDF - Allegro MicroSystems

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ACS723
Allegro MicroSystems

Part Number ACS723
Description Galvanically Isolated Current Sensor IC
Page 14 Pages


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ACS723
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
FEATURES AND BENEFITS
• 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 = 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
• Integrated shield virtually eliminates capacitive
coupling from current conductor to die, greatly
suppressing output noise due to high dv/dt transients
• 4.5 to 5.5 V, single supply operation
• Output voltage proportional to AC or DC current
• Factory-trimmed sensitivity and quiescent output voltage
Continued on the next page…
Package: 8-pin SOIC (suff ix LC)
DESCRIPTION
The AllegroACS723 current sensor IC is an economical and
precise solution for AC or DC current sensing in industrial,
commercial, and communications 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.
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 and 2, to pins 3
and 4), which is the path used for current sensing. The internal
resistance of this conductive path is 0.65 mΩ typical, providing
low power loss.
The terminals of the conductive path are electrically isolated
from the sensor leads (pins 5 through 8). This allows the
ACS723 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.
Approximate Scale 1:1
Continued on the next page…
ACS723-DS
1
IP+
8
VCC
+IP ACS723
2 IP+
7
VIOUT
IP
3 IP–
–IP
4
IP–
6
BW_SEL
GND 5
The ACS723 outputs an
analog signal, VIOUT , that
changes, proportionally,
with the bidirectional AC or
DC primary sensed current,
CBYPASS
0.1 µF
IP , within the specified
measurement range. The
BW_SEL pin can be used
to select one of the two
CL
bandwidths to optimize the
noise performance.
Typical Application



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ACS723
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
Features and Benefits (continued)
Description (continued)
for improved accuracy
• Chopper stabilization results in extremely stable quiescent
output voltage
• Nearly zero magnetic hysteresis
• Ratiometric output from supply voltage
The ACS723 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.
Selection Guide
Part Number
IPR
(A)
ACS723LLCTR-05AB-T2
±5
ACS723LLCTR-10AU-T2
10
ACS723LLCTR-10AB-T2
±10
ACS723LLCTR-20AU-T2
20
ACS723LLCTR-20AB-T2
±20
ACS723LLCTR-40AU-T2
40
ACS723LLCTR-40AB-T2
±40
1Contact Allegro for additional packing options.
2Variant not intended for automotive applications.
Sens(Typ)
at VCC = 5.0 V
(mV/A)
400
200
100
50
TA
(°C)
-40 to 150
Packing1
Tape and Reel, 3000 pieces per reel
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2



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ACS723
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Voltage
Reverse Output Voltage
Operating Ambient Temperature
Junction Temperature
Storage Temperature
SPECIFICATIONS
Symbol
VCC
VRCC
VIOUT
VRIOUT
TA
TJ(max)
Tstg
Range L
Notes
Rating
6
–0.1
25
–0.1
–40 to 150
165
–65 to 165
Units
V
V
V
V
°C
°C
°C
Isolation Characteristics
Characteristic
Dielectric Strength Test Voltage
Working Voltage for Basic Isolation
Clearance
Creepage
Symbol
VISO
Notes
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).
VWVBI
Maximum approved working voltage for basic (single) isolation
according UL 60950-1 (edition 2).
Dcl Minimum distance through air from IP leads to signal leads.
Dcr
Minimum distance along package body from IP leads to signal
leads.
Rating
Unit
2400
VRMS
420 VPK or VDC
297 VRMS
3.9 mm
3.9 mm
Thermal Characteristics
Characteristic
Package Thermal Resistance
(Junction to Ambient)
Package Thermal Resistance
(Junction to Lead)
Symbol
RθJA
RθJL
Test Conditions*
Mounted on the Allegro 85-xxxx evaluation board with 1500 mm2 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.
Mounted on the Allegro ASEK 723 evaluation board.
*Additional thermal information available on the Allegro website.
Value
23
5
Units
ºC/W
ºC/W
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3



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ACS723
High Accuracy, Galvanically Isolated Current Sensor IC
With Small Footprint SOIC8 Package
VCC
Master Current
Supply
To All Subcircuits
POR
Programming
Control
Hall
Current
Drive
Temperature
Sensor
EEPROM and
Control Logic
IP+
Offset
Control
Sensitivity
IP+ Control
Tuned
Filter
IP
IP
BW_SEL GND
Functional Block Diagram
VIOUT
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4



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