ACS756
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Features and Benefits
▪
Industry-leading noise performance through proprietary
amplifier and filter design techniques
▪
Total output error 0.8% at T
A
= 25°C
▪
Small package size, with easy mounting capability
▪
Monolithic Hall IC for high reliability
▪
Ultra-low power loss: 130
μΩ
internal conductor resistance
▪
3 kV
RMS
minimum isolation voltage from
pins 1-3 to pins 4-5
▪
3.0 to 5.0 V, single supply operation
▪
3
μs
output rise time in response to step input current
▪
20 or 40 mV/A output sensitivity
▪
Output voltage proportional to AC or DC currents
▪
Factory-trimmed for accuracy
▪
Extremely stable output offset voltage
▪
Nearly zero magnetic hysteresis
TÜV America
Certificate Number:
U8V 09 05 54214 021
Description
The Allegro ACS756 family of current sensor ICs provides
economical and precise solutions for AC or DC current sensing
in industrial, automotive, commercial, and communications
systems. The device package allows for easy implementation by
the customer. Typical applications include motor control, load
detection and management, power supplies, and overcurrent
fault protection.
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 voltage is provided by the low-offset,
chopper-stabilized BiCMOS Hall IC, which is programmed
for accuracy at the factory.
The output of the device has a positive slope (>V
CC
/ 2) 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 130
μΩ
typical, providing low power loss.
The thickness of the copper conductor allows survival of the
device at up to 5× overcurrent conditions. The terminals of the
Package: 5 pin package (suffix PFF)
1
Continued on the next page…
Additional leadforms available for qualifying volumes
Typical Application
+5 V
4
IP+
ACS756
VCC
1
C
BYP
0.1
μF
C
F
IP–
VIOUT
3
R
F
V
OUT
I
P
5
GND
2
Application 1. The ACS756 outputs an analog signal, V
OUT
, that
varies linearly with the uni- or bi-directional AC or DC primary
sampled current, I
P
, within the range specified. C
F
is for optimal
noise management, with values that depend on the application.
ACS756-DS, Rev. 6
ACS756
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Description (continued)
conductive path are electrically isolated from the signal leads (pins
1 through 3). This allows the ACS756 family of sensor 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 ACS75x 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
T
OP
(°C)
–20 to 85
–20 to 85
–40 to 125
Primary Sampled
Current , I
P
(A)
±50
±100
±50
34 per tube
Packing
2
ACS756SCA-050B-PFF-T
ACS756SCA-100B-PFF-T
ACS756KCA-050B-PFF-T
1
Additional
2
Contact Allegro
leadform options available for qualified volumes
for additional packing options.
Absolute Maximum Ratings
Characteristic
Forward Supply Voltage
Reverse Supply Voltage
Forward Output Voltage
Reverse Output Voltage
Working Voltage for Reinforced Isolation
Symbol
V
CC
V
RCC
V
IOUT
V
RIOUT
V
WORKING-R
Voltage applied between pins 1-3 and 4-5;
tested at 3000 VAC for 1 minute according to
UL standard 60950-1
Voltage applied between pins 1-3 and 4-5;
tested at 3000 VAC for 1 minute according to
UL standard 60950-1
VIOUT to GND
VCC to VIOUT
Range K
Range S
Notes
Rating
8
–0.5
28
–0.5
353
Units
V
V
V
V
VDC / V
pk
Working Voltage for Basic Isolation
Output Source Current
Output Sink Current
Nominal Operating Ambient Temperature
Maximum Junction
Storage Temperature
V
WORKING-B
I
OUT(Source)
I
OUT(Sink)
T
OP
T
J
(max)
T
stg
500
3
1
–40 to 125
–20 to 85
165
–65 to 165
VDC / V
pk
mA
mA
ºC
ºC
ºC
ºC
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
ACS756
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Functional Block Diagram
+5 V
IP+
VCC
To all subcircuits
Dynamic Offset
Cancellation
Amp
Filter
Out
VIOUT
0.1
μF
Gain
Temperature
Coefficient
Trim Control
Offset
IP–
GND
Pin-out Diagram
IP+
4
3
2
IP–
5
1
VIOUT
GND
VCC
Terminal List Table
Number
1
2
3
4
5
Name
VCC
GND
VIOUT
IP+
IP–
Device power supply terminal
Signal ground terminal
Analog output signal
Terminal for current being sampled
Terminal for current being sampled
Description
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
ACS756
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
COMMON OPERATING CHARACTERISTICS
1
over full range of T
OP
, and V
CC
= 5 V, unless otherwise specified
Characteristic
Supply Voltage
2
Supply Current
Power On Time
Rise Time
Internal Bandwidth
3
Output Load Resistance
Output Load Capacitance
Primary Conductor Resistance
Symmetry
Bidirectional 0 A Output
Magnetic Offset Error
Ratiometry
Propagation Time
1
Device
2
Devices
Symbol
V
CC
I
CC
t
PO
t
r
BW
i
R
LOAD(MIN)
C
LOAD(MAX)
R
PRIMARY
E
SYM
V
OUT(QBI)
I
ERROM
V
RAT
t
PROP
Test Conditions
V
CC
= 5.0 V, output open
T
A
= 25°C
I
P
= three-quarter scale of I
P
+, T
A
= 25°C, C
OUT
= 0.47 nF
–3 dB; I
P
is 10 A peak-to-peak; 100 pF from VIOUT to GND
VIOUT to GND
VIOUT to GND
T
A
= 25°C
Over half-scale of Ip
I
P
= 0 A, T
A
= 25°C
I
P
= 0 A, after excursion of 100 A
V
CC
= 4.5 to 5.5 V
T
A
= 25°C, C
OUT
= 100 pF,
Min.
3
–
–
–
–
4.7
–
–
98.5
–
–
–
–
Typ.
5.0
10
35
3
120
–
–
130
100
V
CC
/2
±0.23
100
1
Max.
5.5
14
–
–
–
–
10
–
101.5
–
–
–
–
Units
V
mA
μs
μs
kHz
kΩ
nF
μΩ
%
V
A
%
μs
is factory-trimmed at 5 V, for optimal accuracy.
are programmed for maximum accuracy at 5.0 V V
CC
levels. The device contains ratiometry circuits that accurately alter the 0 A Output Volt-
age and Sensitivity level of the device in proportion to the applied V
CC
level. However, as a result of minor nonlinearities in the ratiometry circuit ad-
ditional output error will result when V
CC
varies from the 5 V V
CC
level. Customers that plan to operate the device from a 3.3 V regulated supply should
contact their local Allegro sales representative regarding expected device accuracy levels under these bias conditions.
3
Guaranteed by design.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
ACS756
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
X050
PERFORMANCE CHARACTERISTICS over Range K
1
:
Characteristic
Primary Sampled Current
Sensitivity
Noise
2
Nonlinearity
Symbol
I
P
Sens
TA
Sens
TOP
V
NOISE
E
LIN(HT)
E
LIN(LT)
V
OE(TA)
Electrical Offset Voltage
3
T
OP
= –40°C to 125°C, V
CC
= 5 V, unless otherwise specified
Min.
–50
–
37.2
–
–1
– 1.8
–
–30
–60
–7.5
–7.5
Typ.
–
40
–
10
–
–
±2
–
–
–
–
Max.
50
–
42.8
–
1
1.8
–
30
60
7.5
7.5
Units
A
mV/A
mV/A
mV
%
%
mV
mV
mV
%
%
Test Conditions
Half scale of I
P
applied for 5 ms, T
A
= 25°C
Half scale of I
P
applied for 5 ms
T
A
= 25°C, 10 nF on VIOUT pin to GND
Up to full scale of I
P
, I
P
applied for 5 ms, T
OP
= 25°C to 125°C
Up to full scale of I
P
, I
P
applied for 5 ms, T
OP
= –40°C to 25°C
I
P
= 0 A, T
A
= 25°C
V
OE(TOP)HT
I
P
= 0 A, T
OP
= 25°C to 125°C
V
OE(TOP)LT
I
P
= 0 A, T
OP
= –40°C to 25°C
E
TOT(HT)
E
TOT(LT)
Over full scale of I
P
, I
P
applied for 5 ms, T
OP
= 25°C to 125°C
Over full scale of I
P
, I
P
applied for 5 ms, T
OP
= –40°C to 25°C
Total Output Error
4
1
Device
may be operated at higher primary current levels, I
P
, and ambient temperatures, T
OP
, provided that the Maximum Junction Temperature,
T
J
(max), is not exceeded.
2
6σ noise voltage.
3
V
OE(TOP)
drift is referred to ideal V
OE
= 2.5 V at 0 A.
4
Percentage of I , with I = 25 A. Output filtered.
P
P
X050
PERFORMANCE CHARACTERISTICS over Range S
1
:
Characteristic
Primary Sampled Current
Sensitivity
Noise
2
Nonlinearity
Symbol
I
P
Sens
TA
Sens
TOP
V
NOISE
E
LIN(HT)
E
LIN(LT)
V
OE(TA)
Electrical Offset
Voltage
3
T
OP
= –20°C to 85°C, V
CC
= 5 V, unless otherwise specified
Min.
–50
–
38.3
–
–1
–1
–
–30
–30
–5
–5
Typ.
–
40
–
10
–
–
±2
–
–
–
–
Max.
50
–
41.7
–
1
1
–
30
30
5
5
Units
A
mV/A
mV/A
mV
%
%
mV
mV
mV
%
%
Test Conditions
Half scale of I
P
applied for 5 ms, T
A
= 25°C
Half scale of I
P
applied for 5 ms
T
A
= 25°C, 10 nF on VIOUT pin to GND
Up to full scale of I
P
, I
P
applied for 5 ms, T
OP
= 25°C to 85°C
Up to full scale of I
P
, I
P
applied for 5 ms, T
OP
= –20°C to 25°C
I
P
= 0 A, T
A
= 25°C
V
OE(TOP)HT
I
P
= 0 A, T
OP
= 25°C to 85°C
V
OE(TOP)LT
I
P
= 0 A, T
OP
= –20°C to 25°C
E
TOT(HT)
E
TOT(LT)
Over full scale of I
P
, I
P
applied for 5 ms, T
OP
= 25°C to 85°C
Over full scale of I
P
, I
P
applied for 5 ms, T
OP
= –20°C to 25°C
Total Output Error
4
1
Device
may be operated at higher primary current levels, I
P
, and ambient temperatures, T
OP
, provided that the Maximum Junction Temperature,
T
J
(max), is not exceeded.
2
6σ noise voltage.
3
V
OE(TOP)
drift is referred to ideal V
OE
= 2.5 V at 0 A.
4
Percentage of I , with I = 25 A. Output filtered.
P
P
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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