ACS755xCB-130
Fully Integrated, Hall Effect-Based Linear Current Sensor
with High Voltage Isolation and a Low-Resistance Current Conductor
Features and Benefits
▪
Monolithic Hall IC for high reliability
▪
Single +5 V supply
▪
3 kV
RMS
isolation voltage between terminals 4/5 and
pins 1/2/3 for up to 1 minute
▪
35 kHz bandwidth
▪
Automotive temperature range
▪
End-of-line factory-trimmed for gain and offset
▪
Ultra-low power loss: 100
μΩ
internal conductor
resistance
▪
Ratiometric output from supply voltage
▪
Extremely stable output offset voltage
▪
Small package size, with easy mounting capability
▪
Output proportional to DC currents
Description
The Allegro ACS755 family of current sensors provides
economical and precise solutions for 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 sensor
circuit with a copper conduction path located near 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 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 will be valid when a current flows
through the primary copper conduction path from terminal 4
to terminal 5, which is the path used for current sensing. The
internal resistance of this conductive path is 100
μΩ
typical,
providing low power loss.
Continued on the next page…
Package: 5 pin module (leadform PFF)
Typical Application
+5 V
4
I
P
5
IP–
IP+
ACS755
VCC
1
C
BYP
0.1 µF
C
F
VIOUT
3
R
F
V
OUT
GND
2
Application 1. The ACS755 outputs an analog signal, V
OUT
.
that varies linearly with the unidirectional DC primary sensed
current, I
P
, within the range specified. C
F
is recommended for
noise management, with values that depend on the application.
ACS755130-DS Rev. 7
ACS755xCB-130
Fully Integrated, Hall Effect-Based Linear Current Sensor
with High Voltage Isolation and a Low-Resistance Current Conductor
Description (continued)
The thickness of the copper conductor allows survival of the device
at up to 5× overcurrent conditions. The terminals of the conductive
path are electrically isolated from the sensor leads (pins 1 through 3).
This allows the ACS755 family of sensors 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
ACS755LCB-130-PFF
ACS755LCB-130-PSF
2
ACS755SCB-130-PFF
3
ACS755SCB-130-PSF
3
1
Contact Allegro
2
Variant
T
OP
(°C)
–40 to 150
–40 to 150
–20 to 85
–20 to 85
Primary Sensed
Current, I
P
(A)
130
130
130
130
Sensitivity
Sens (Typ.)
(mV/A)
30
30
30
30
Bandwidth
(kHz)
35
35
35
35
Package
Terminals
Formed
Straight
Formed
Straight
Signal Pins
Formed
Formed
Formed
Formed
170 pieces per bulk bag
Packing
1
for additional packing options.
is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently
restricted to existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future
is probable. Samples are no longer available. Status change: April 28, 2008.
2
Variant is in production but has been determined to be LAST TIME BUY. This classification indicates that the variant is obsolete and notice has been
given. Sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications
because of obsolescence in the near future. Samples are no longer available. Status date change November 1, 2008. Deadline for receipt of LAST
TIME BUY orders is May 1, 2008.
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Voltage
Reverse Output Voltage
Maximum Basic Isolation Voltage
Maximum Rated Input Current
Output Current Source
Output Current Sink
Nominal Operating Ambient Temperature
Maximum Junction
Storage Temperature
Symbol
V
CC
V
RCC
V
IOUT
V
RIOUT
V
ISO
I
IN
I
OUT(Source)
I
OUT(Sink)
T
A
T
J
(max)
T
stg
Range L
Range S
Notes
Rating
16
–16
16
–0.1
353 VAC, 500 VDC, or V
pk
200
3
10
–40 to 150
–20 to 85
165
–65 to 170
Units
V
V
V
V
V
A
mA
mA
ºC
ºC
ºC
ºC
TÜV America
Certificate Number:
U8V 04 11 54214 001
Fire and Electric Shock
EN60950-1:2001
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
ACS755xCB-130
Fully Integrated, Hall Effect-Based Linear Current Sensor
with High Voltage Isolation and a Low-Resistance Current Conductor
Functional Block Diagram
+5 V
IP+
VCC
Voltage
Regulator
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
1
VIOUT
GND
VCC
IP–
5
Terminal List Table
Number
1
2
3
4
5
Name
VCC
GND
VIOUT
IP+
IP–
Device power supply pin
Signal ground pin
Analog output signal pin
Terminal for current being sensed
Terminal for current being sensed
Description
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
ACS755xCB-130
Fully Integrated, Hall Effect-Based Linear Current Sensor
with High Voltage Isolation and a Low-Resistance Current Conductor
ELECTRICAL CHARACTERISTICS,
over operating ambient temperature range unless otherwise stated
Characteristic
Symbol
Test Conditions
Min.
0
Primary Sensed Current
I
P
Supply Voltage
V
CC
4.5
Supply Current
I
CC
V
CC
= 5.0 V, output open
6.5
I
OUT
= 1.2 mA
–
Output Resistance
R
OUT
Output Capacitance Load
C
LOAD
VOUT to GND
–
Output Resistive Load
R
LOAD
VOUT to GND
4.7
Primary Conductor Resistance
R
PRIMARY
I
P
= +100A; T
A
= 25°C
–
Pins 1-3 and 4-5; 60 Hz, 1 minute
3.0
Isolation Voltage
V
ISO
PERFORMANCE CHARACTERISTICS, -20°C to +85°C,
V
CC
= 5 V unless otherwise specified
Propagation time
t
PROP
I
P
= +50 A, T
A
= 25°C
–
Response time
t
RESPONSE
I
P
= +50 A, T
A
= 25°C
–
I
P
= +50 A, T
A
= 25°C
–
Rise time
t
r
Frequency Bandwidth
f
–3 dB , T
A
= 25°C
–
Over full range of I
P
, T
A
= 25°C
–
Sensitivity
Sens
Over full range of I
P
27.5
Peak-to-peak, T
A
= 25°C,
Noise
V
NOISE
–
no external filter
Linearity
E
LIN
Over full range of I
P
–
Zero Current Output Voltage
V
OUT(Q)
I = 0 A, T
A
= 25°C
–
I = 0 A, T
A
= 25°C
–15
Electrical Offset Voltage
V
OE
(Magnetic error not included)
I=0A
–25
Magnetic Offset Error
I
ERROM
I = 0 A, after excursion of 130 A
–
Over full range of I
P
, T
A
= 25°C
–
Total Output Error
E
TOT
(Including all offsets)
Over full range of I
P
–
PERFORMANCE CHARACTERISTICS, -40°C to +150°C,
V
CC
= 5 V unless otherwise specified
Propagation time
t
PROP
I
P
= +50 A, T
A
= 25°C
–
Response time
t
RESPONSE
I
P
= +50 A, T
A
= 25°C
–
Rise time
t
r
I
P
= +50 A, T
A
= 25°C
–
–
Frequency Bandwidth
f
–3 dB , T
A
= 25°C
Over full range of I
P
, T
A
= 25°C
–
Sensitivity
Sens
Over full range of I
P
27.5
Peak-to-peak, T
A
= 25°C,
–
Noise
V
NOISE
no external filter
Linearity
E
LIN
Over full range of I
P
–
Zero Current Output Voltage
V
OUT(Q)
I = 0 A, T
A
= 25°C
–
I = 0 A, T
A
= 25°C
–15
Electrical Offset Voltage
V
OE
(Magnetic error not included)
I=0A
–50
I
ERROM
I = 0 A, after excursion of 130 A
–
Magnetic Offset Error
Over full range of I
P
, T
A
= 25°C
–
Total Output Error
E
TOT
(Including all offsets)
Over full range of I
P
–
Typ.
–
5.0
8
1
–
–
100
–
4
10
10
35
30
–
55
–
0.6
–
–
±0.1
±1.0
–
4
10
10
35
30
–
55
–
0.6
–
–
±0.1
±1.0
–
Max.
130
5.5
10
2
10
–
–
–
–
–
–
–
–
32.5
–
±0.85
–
15
25
±0.30
–
±7.0
–
–
–
–
–
32.5
–
±0.85
–
15
50
±0.30
–
±8.0
Units
A
V
mA
Ω
nF
kΩ
μΩ
kV
μs
μs
μs
kHz
mV/A
mV/A
mV
%
V
mV
mV
A
%
%
μs
μs
μs
kHz
mV/A
mV/A
mV
%
V
mV
mV
A
%
%
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
ACS755xCB-130
Fully Integrated, Hall Effect-Based Linear Current Sensor
with High Voltage Isolation and a Low-Resistance Current Conductor
Definitions of Accuracy Characteristics
Sensitivity (Sens).
The change in sensor output in response to a
1 A change through the primary conductor. The sensitivity is the
product of the magnetic circuit sensitivity (G / A) and the linear
IC amplifier gain (mV/G). The linear IC amplifier gain is pro-
grammed at the factory to optimize the sensitivity (mV/A) for the
full-scale current of the device.
Noise (V
NOISE
).
The product of the linear IC amplifier gain
(mV/G) and the noise floor for the Allegro Hall effect linear IC
(≈1 G). The noise floor is derived from the thermal and shot
noise observed in Hall elements. Dividing the noise (mV) by the
sensitivity (mV/A) provides the smallest current that the device is
able to resolve.
Linearity (E
LIN
).
The degree to which the voltage output from
the sensor varies in direct proportion to the primary current
through its full-scale amplitude. Nonlinearity in the output can be
attributed to the saturation of the flux concentrator approaching
the full-scale current. The following equation is used to derive the
linearity:
100 1 –
V
IOUT_
3
/
4
full-scale IP
–
V
IOUT(Q)
3
V
IOUT_
1
/
4
full-scale IP
–
V
IOUT(Q)
it nominally remains at 0.6. Variation in V
IOUT(Q)
can be attributed
to the resolution of the Allegro linear IC quiescent voltage trim
and thermal drift.
Electrical offset voltage (V
OE
).
The deviation of the device out-
put from its ideal quiescent value due to nonmagnetic causes.
Magnetic offset error (I
ERROM
).
The magnetic offset is due to
the residual magnetism (remnant field) of the core material. The
magnetic offset error is highest when the magnetic circuit has
been saturated, usually when the device has been subjected to a
full-scale or high-current overload condition. The magnetic offset
is largely dependent on the material used as a flux concentrator.
The larger magnetic offsets are observed at the lower operating
temperatures.
Accuracy (E
TOT
).
The accuracy represents the maximum devia-
tion of the actual output from its ideal value. This is also known
as the total ouput error. The accuracy is illustrated graphically in
the output voltage versus current chart on the following page.
Accuracy is divided into four areas:
0 A at 25°C.
Accuracy of sensing zero current flow at 25°C,
without the effects of temperature.
0 A over
Δ
temperature.
Accuracy of sensing zero current
flow including temperature effects.
Full-scale current at 25°C.
Accuracy of sensing the full-scale
current at 25°C, without the effects of temperature.
Full-scale current over
Δ
temperature.
Accuracy of sensing full-
scale current flow including temperature effects.
where
V
IOUT_¼ full-scale IP
(V) is the output voltage when the sensed
current approximates 0.25
I
P
(max), and
V
IOUT_¾ full-scale IP
(V) is the output voltage when the sensed
current approximates 0.75
I
P
(max).
Quiescent output voltage (V
IOUT(Q)
).
The output of the sensor
when the primary current is zero. For a unipolar supply voltage,
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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