ACS773
High Accuracy, Hall-Effect-Based, 200 kHz Bandwidth,
Galvanically Isolated Current Sensor IC with 100 µΩ Current Conductor
FEATURES AND BENEFITS
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AEC-Q100 Grade 1 qualified
Typical of 2.5 μs output response time
3.3 V supply operation
Ultra-low power loss: 100 μΩ internal conductor resistance
Reinforced galvanic isolation allows use in economical,
high-side current sensing in high-voltage systems
4800 Vrms dielectric strength certified under UL60950-1
Industry-leading noise performance with greatly
improved bandwidth through proprietary amplifier and
filter design techniques
Integrated shield greatly reduces capacitive coupling
from current conductor to die due to high dV/dt signals,
and prevents offset drift in high-side, high-voltage
applications
Greatly improved total output error through digitally
programmed and compensated gain and offset over the
full operating temperature range
Small package size, with easy mounting capability
Monolithic Hall IC for high reliability
Output voltage proportional to AC or DC currents
Factory-trimmed for accuracy
Extremely stable output offset voltage
DESCRIPTION
The Allegro™ ACS773 family of current sensor ICs provide
economical and precise solutions for AC or DC current sensing,
ideal for motor control, load detection and management, power
supply and DC-to-DC converter control, and inverter control.
The 2.5 µs response time enables overcurrent fault detection
in safety-critical applications.
The device consists of a precision, low-offset linear Hall
circuit with a copper conduction path located near the die.
Applied current flowing through this copper conduction path
generates a magnetic field which the Hall IC converts into a
proportional voltage. Device accuracy is optimized through the
close proximity of the magnetic signal to the Hall transducer.
A precise, proportional output voltage is provided by the
low-offset, chopper-stabilized BiCMOS Hall IC, which is
programmed for accuracy at the factory. Proprietary digital
temperature compensation technology greatly improves the
IC accuracy and temperature stability.
High-level immunity to current conductor dV/dt and stray
electric fields is offered by Allegro proprietary integrated shield
technology for low output voltage ripple and low offset drift
in high-side, high-voltage applications.
The output of the device increases when an increasing current
flows through the primary copper conduction path (from
terminal 4 to terminal 5), which is the path used for current
sampling. The internal resistance of this conductive path is
100 μΩ typical, providing low power loss.
The thickness of the copper conductor allows survival of the
device at high overcurrent conditions. The terminals of the
conductive path are electrically isolated from the signal leads
(pins 1 through 3). This allows the ACS773 family of sensor
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Package: 5-pin package (suffix CB)
Not to scale
Continued on the next page…
3.3 V
Application 1: the ACS773 outputs an analog
signal, V
OUT
, that varies linearly with the
bidirectional AC or DC primary sensed cur-
rent, I
P
, within the range specified. R
F
and
C
F
are for optimal noise management, with
values that depend on the application.
4
I
P
5
IP+
ACS773
VCC
1
2
C
F
C
BYP
0.1 µF
GND
IP–
VIOUT
3
R
F
V
OUT
Typical Application
ACS773-DS, Rev. 2
MCO-0000364
May 29, 2018
ACS773
DESCRIPTION (continued)
High Accuracy, Hall-Effect-Based,
200 kHz Bandwidth, Galvanically Isolated
Current Sensor IC with 100 µΩ Current Conductor
ICs to be used in applications requiring electrical isolation without
the use of opto-isolators or other costly isolation techniques.
The device is fully calibrated prior to shipment from the factory.
The ACS773 family is lead (Pb) free. All leads are plated with 100%
matte tin, and there is no Pb inside the package. The heavy gauge
leadframe is made of oxygen-free copper.
SELECTION GUIDE
Part
Number
[1]
Package
Terminals
Formed
Formed
Formed
Formed
Signal Pins
Formed
Formed
Formed
Formed
Primary Sampled
Current , I
P
(A)
±50
±100
±150
±200
Sensitivity
Sens (Typ.)
(mV/A)
[2]
26.4
13.2
8.8
6.6
T
OP
(°C)
–40 to 150
–40 to 125
–40 to 85
Packing
[3]
ACS773LCB-050B-PFF-T
ACS773LCB-100B-PFF-T
ACS773KCB-150B-PFF-T
ACS773ECB-200B-PFF-T
[1]
Additional
[2]
34 pieces
per tube
leadform options available for qualified volumes.
Measured at V
CC
= 3.3 V.
[3]
Contact Allegro for additional packing options.
ACS
773
L
CB
- 050 B - PFF - T
Lead (Pb) Free
Lead Form
Output Directionality:
B – Bidirectional (positive and negative current)
U – Unidirectional (only positive current)
Current Sensing Range (A)
Package Designator
Operating Temperature Range
3 Digit Part Number
Allegro Current Sensor
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2
ACS773
ABSOLUTE MAXIMUM RATINGS
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Voltage
Reverse Output Voltage
Output Source Current
Output Sink Current
Nominal Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
V
IOUT
V
RIOUT
I
OUT(Source)
I
OUT(Sink)
T
A
T
J
(max)
T
stg
High Accuracy, Hall-Effect-Based,
200 kHz Bandwidth, Galvanically Isolated
Current Sensor IC with 100 µΩ Current Conductor
Notes
Rating
6.5
–0.5
6.5
–0.5
Unit
V
V
V
V
mA
mA
°C
°C
°C
°C
°C
VIOUT to GND
Minimum pull-up resistor of 500 Ω from VCC to VIOUT
Range E
Range K
Range L
3
10
–40 to 85
–40 to 125
–40 to 150
165
–65 to 165
ISOLATION CHARACTERISTICS
Characteristic
Dielectric Surge Strength Test Voltage
Dielectric Strength Test Voltage
[1]
Working Voltage for Basic Isolation
Working Voltage for Reinforced Isolation
[1]
Allegro
Symbol
V
SURGE
V
ISO
V
WVBI
V
WFRI
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 standard
60950-1, 2nd Edition. Tested at 3000 V
RMS
for 1 second
in production.
For basic (single) isolation per UL standard 60950-1, 2nd
Edition
For reinforced (double) isolation per UL standard
60950-1, 2nd Edition
Rating
8000
4800
990
700
636
450
Unit
V
V
RMS
V
PK
or V
DC
V
RMS
V
PK
or V
DC
V
RMS
does not conduct 60-second testing. It is done only during the UL certification process.
THERMAL CHARACTERISTICS:
May require derating at maximum conditions
Characteristic
Symbol
Test Conditions
[2]
Mounted on the Allegro evaluation board with 2800 mm
2
(1400 mm
2
on component side and 1400 mm
2
on
opposite side) of 4 oz. copper connected to the primary
leadframe and with thermal vias connecting the copper
layers. Performance is based on current flowing through
the primary leadframe and includes the power consumed
by the PCB.
Value
Unit
Package Thermal Resistance
R
θJA
7
°C/W
[2]
Additional
thermal information available on the Allegro website
TYPICAL OVERCURRENT CAPABILITIES
[3][4]
Characteristic
Overcurrent
Symbol
I
POC
Notes
T
A
= 25°C, current is on for 1 second and off for 99 seconds, 100 pulses applied
T
A
= 85°C, current is on for 1 second and off for 99 seconds, 100 pulses applied
T
A
= 150°C, current is on for 1 second and off for 99 seconds, 100 pulses applied
[3]
Test
[4]
For
Rating
1200
900
600
Unit
A
A
A
was done with Allegro evaluation board. The maximum allowed current is limited by T
J
(max) only.
more overcurrent profiles, please see FAQ on the Allegro website, www.allegromicro.com.
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
3
ACS773
High Accuracy, Hall-Effect-Based,
200 kHz Bandwidth, Galvanically Isolated
Current Sensor IC with 100 µΩ Current Conductor
IP+
VCC
C
BYPASS
To all subcircuits
Programming
Control
Charge Pump Pulse
Generator
Undervoltage
Detection
Temperature
Sensor
EEPROM and
Control Logic
Sensitivity Control
Active Temperature
Compensation
Offset Control
Output Clamps
Dynamic Offset
Cancellation
Signal Recovery
V
IOUT
C
L
IP–
GND
Functional Block Diagram
IP+
4
Terminal List Table
3
2
1
VIOUT
GND
VCC
Number
1
2
3
4
5
Name
VCC
GND
VIOUT
IP+
IP–
Device power supply terminal
Signal ground terminal
Analog output signal
Description
IP–
5
Pinout Diagram
Terminal for current being sampled
Terminal for current being sampled
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
4
ACS773
High Accuracy, Hall-Effect-Based,
200 kHz Bandwidth, Galvanically Isolated
Current Sensor IC with 100 µΩ Current Conductor
COMMON OPERATING CHARACTERISTICS: Valid at T
OP
= –40°C to 150°C, C
BYP
= 0.1 µF, and V
CC
= 3.3 V, unless otherwise specified
Characteristic
Supply Voltage
Supply Current
Power-On Delay
Power-On Reset Voltage
POR Hysteresis
Internal Bandwidth
Rise Time
Propagation Delay Time
Response Time
DC Output Impedance
Output Load Resistance
Output Load Capacitance
Primary Conductor Resistance
Output Saturation Voltage
ERROR COMPONENTS
QVO Ratiometry Error
[1]
Sens Ratiometry Error
[1]
Noise
Nonlinearity
[1]
Symmetry
[1]
[1]
Symbol
V
CC
I
CC
t
POD
V
PORH
V
PORL
V
HYS(POR)
BW
i
t
r
t
PROP
t
RESPONSE
R
OUT
R
LOAD(MIN)
C
LOAD(MAX)
R
PRIMARY
V
SAT(HIGH)
V
SAT(LOW)
Rat
ERRQVO
Rat
ERRSens
I
N
E
LIN
E
SYM
Test Conditions
Min.
3
Typ.
3.3
10
64
2.9
2.5
–
200
2.4
1.2
2.5
3.3
–
1
100
–
–
±0.15
±0.3
0.2
120
±0.5
±0.4
Max.
3.6
15
–
–
–
–
–
–
–
–
–
–
10
–
–
200
–
–
–
–
0.9
0.8
Unit
V
mA
µs
V
V
mV
kHz
µs
µs
µs
Ω
kΩ
nF
µΩ
V
mV
%
%
mA / √¯(Hz)
mA
RMS
%
%
ELECTRICAL CHARACTERISTICS
V
CC
≤ 5 V, no load on output
T
A
= 25°C
V
CC
rising at 1 V/ms
V
CC
falling at 1 V/ms
Small signal –3 dB, C
L
= 4.7 nF
I
P
step = 50% of I
P
+, 10% to 90% rise time, T
A
= 25°C,
C
OUT
= 470 pF
T
A
= 25°C, C
L
= 470 pF, IP step = 50% of IP+
T
A
= 25°C, C
L
= 470 pF, IP step = 50% of IP+,
90% input to 90% output
T
A
= 25°C
VIOUT to GND, VIOUT to VCC
VIOUT to GND
T
A
= 25°C
T
A
= 25°C, R
L(PULLDWN)
= 10 kΩ to GND
T
A
= 25°C, R
L(PULLUP)
= 10 kΩ to VCC
V
CC
= 3.15 to 3.45 V
V
CC
= 3.15 to 3.45 V
Input referenced noise density; T
A
= 25°C, C
L
= 1 nF
Input referenced noise at 200 kHz; T
A
= 25°C, C
L
= 1 nF
Up to full scale of I
P
Over half-scale I
P
–
–
–
–
250
–
–
–
–
–
4.7
–
–
V
CC
–
0.2
–
–
–
–
–
–0.9
–0.8
See Characteristic Definitions section of this datasheet.
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
5
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