Current Sensor: ACS754xCB-050
The Allegro ACS75x family of current sensors provides economical and
precise solutions for 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.
5
Package CB-PFF
1
2
4
3
5
4
The output of the device has a positive slope (>VCC / 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 sensing. The internal resistance of
this conductive path is typically 100 µΩ, 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 conductive path are electrically isolated from the
sensor leads (pins 1 through 3). This allows the ACS75x family of sensors to be
used in applications requiring electrical isolation without the use of opto-isolators
or other costly isolation techniques.
Package CB-PSF
1
2
3
5
Package CB-PSS
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, chopperstabilized BiCMOS Hall IC, which is programmed for accuracy at the factory.
4
The device is fully calibrated prior to shipment from the factory. The ACS75x
family is lead-free. All leads are coated with 100% matte tin, and there is no lead
inside the package. The heavy gauge leadframe is made of oxygen-free copper.
Features and Benefits
1
2
3
Pin 1: VCC
Pin 2: GND
Pin 3: VOUT
Terminal 4: IP+
Terminal 5: IP–
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC .......................................... 16 V
Reverse Supply Voltage, VRCC ........................ –16 V
Output Voltage, VOUT ........................................ 16 V
Reverse Output Voltage, VROUT...................... –0.1 V
Output Current Source, IOUT(Source) ................. 3 mA
Output Current Sink, IOUT(Sink) .......................10 mA
Operating Temperature,
Ambient, TA, L range ..................... –40 to 150ºC
Ambient, TA, S range ....................... –20 to 85ºC
Maximum Junction, TJ(max)............................. 165°C
Maximum Storage Temperature, TS .... –65 to 170°C
TÜV America
Certificate Number:
U8V 04 11 54214 001
ACS754050-DS, Rev. 3
•
•
•
•
•
•
•
•
•
•
•
Monolithic Hall IC for high reliability
Single +5 V supply
3 kVRMS isolation voltage between terminals 4/5 and pins 1/2/3
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 ac and dc currents
Applications
• Automotive systems
• Industrial systems
• Motor control
• Servo systems
• Power conversion
• Battery monitors
Use the following complete part numbers when ordering:
Part Number
Signal Pins
Terminals
ACS754LCB-050-PFF
ACS754LCB-050-PSF
ACS754LCB-050-PSS
ACS754SCB-050-PFF
ACS754SCB-050-PSF
ACS754SCB-050-PSS
Formed
Formed
Straight
Formed
Formed
Straight
Formed
Straight
Straight
Formed
Straight
Straight
Ambient
–40 to 150°C
–20 to 85°C
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Current Sensor: ACS754xCB-050
Functional Block Diagram
+5 V
IP–
Terminal 5
VCC
Pin 1
Voltage
Regulator
Filter
Dynamic Offset
Cancellation
To all subcircuits
Amp
Out
VOUT
Pin 3
0.1 µF
Gain
Temperature
Coefficient
Offset
Trim Control
IP+
Terminal 4
GND
Pin 2
2
ACS754050-DS, Rev. 3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Current Sensor: ACS754xCB-050
ELECTRICAL CHARACTERISTICS, over operating ambient temperature range unless otherwise stated
Characteristic
Primary Sensed Current
Supply Voltage
Supply Current
Output Resistance
Output Capacitance Load
Output Resistive Load
Primary Conductor Resistance
Symbol
IP
VCC
ICC
ROUT
CLOAD
RLOAD
RPRIMARY
Min.
–50
4.5
VCC = 5.0 V, output open
6.5
IOUT = 1.2 mA
–
VOUT to GND
–
VOUT to GND
4.7
IP = ±100A; TA = 25°C
–
Pins 1-3 and 4-5; 60 Hz, 1 minute
3.0
PERFORMANCE CHARACTERISTICS, -20°C to +85°C, VCC = 5 V unless otherwise specified
Propagation time
tPROP
IP = ±50 A, TA = 25°C
–
–
Response time
tRESPONSE IP = ±50 A, TA = 25°C
Rise time
tr
Frequency Bandwidth
f
Test Conditions
IP = ±50 A, TA = 25°C
–
–3 dB , TA = 25°C
–
Over full range of IP , TA = 25°C
–
Sensitivity
Sens
Over full range of IP
37.8
Peak-to-peak, TA = 25°C,
–
Noise
VNOISE
no external filter
Nonlinearity
ELIN
Over full range of IP
–
Symmetry
ESYM
Over full range of IP
98
I = 0 A, TA = 25°C
–
Zero Current Output Voltage
VOUT(Q)
I = 0 A, TA = 25°C
–10
Electrical Offset Voltage
VOE
(Magnetic error not included)
I=0A
–20
Magnetic Offset Error
IERROM
I = 0 A, after excursion of 100 A
–
Over full range of IP , TA = 25°C
–
Total Output Error
ETOT
(Including all offsets)
Over full range of IP
–
PERFORMANCE CHARACTERISTICS, -40°C to +150°C, VCC = 5 V unless otherwise specified
Propagation time
tPROP
IP = ±50 A, TA = 25°C
–
Response time
tRESPONSE
ELIN
ESYM
VOUT(Q)
Electrical Offset Voltage
(Magnetic error not included)
VOE
Magnetic Offset Error
IERROM
Total Output Error
(Including all offsets)
ETOT
µs
µs
11
–
µs
35
40
–
–
–
42.0
kHz
mV/A
mV/A
65
–
mV
–
100
VCC / 2
–
–
±0.1
±1.0
–
±1.5
102
–
10
20
±0.30
–
±5.0
%
%
V
mV
mV
A
%
%
4
–
µs
12
–
µs
11
–
µs
35
40
–
–
–
42.8
kHz
mV/A
mV/A
–
65
–
mV
–
98
–
–10
–35
–
–
–
–
100
VCC / 2
–
–
±0.1
±1.0
–
±1.8
102
–
10
35
±0.40
–
±9.9
%
%
V
mV
mV
A
%
%
–3 dB , TA = 25°C
Over full range of IP , TA = 25°C
Over full range of IP
Peak-to-peak, TA = 25°C,
no external filter
Over full range of IP
Over full range of IP
I = 0 A, TA = 25°C
I = 0 A, TA = 25°C
I=0A
I = 0 A, after excursion of 100 A
Over full range of IP , TA = 25°C
Over full range of IP
Nonlinearity
Symmetry
Zero Current Output Voltage
–
–
–
–
36.0
IP = ±50 A, TA = 25°C
f
VNOISE
4
12
–
tr
Noise
Units
A
V
mA
Ω
nF
kΩ
µΩ
kV
–
Frequency Bandwidth
Sens
Max.
50
5.5
10
2
10
–
–
–
IP = ±50 A, TA = 25°C
Rise time
Sensitivity
Typ.
–
5.0
8
1
–
–
100
–
3
ACS754050-DS, Rev. 3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Current Sensor: ACS754xCB-050
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 trimmed at the
factory to optimize the sensitivity (mV/A) for the full-scale current of the device.
Noise (VNOISE): 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 (ELIN): The degree to which the voltage output from the sensor varies in direct proportion to the primary current through
its full-scale amplitude. Linearity reveals the maximum deviation from the ideal transfer curve for this transducer. Nonlinearity in the
output can be attributed to the gain variation across temperature and saturation of the flux concentrator approaching the full-scale current. The following equation is used to derive the linearity:
{ [
100 1–
∆ gain × % sat ( Vout_full-scale amperes – VOUT(Q) )
2 (Vout_half-scale amperes – VOUT(Q) )
[{
where
∆ gain = the gain variation as a function of temperature changes from 25ºC,
% sat = the percentage of saturation of the flux concentrator, which becomes significant as the current
being sensed approaches full-scale ±IP , and
Vout_full-scale amperes = the output voltage (V) when the sensed current approximates full-scale ±IP .
Symmetry (ESYM): The degree to which the absolute voltage output from the sensor varies in proportion to either a positive or negative full-scale primary current. The following equation is used to derive symmetry:
100
[
Vout_+full-scale amperes – VOUT(Q)
VOUT(Q) –Vout_–full-scale amperes
[
Quiescent output voltage (VOUT(Q)): The output of the sensor when the primary current is zero. For a unipolar supply voltage, it
nominally remains at VCC ⁄ 2. Thus, VCC = 5 V translates into VOUT(Q) = 2.5 V. Variation in VOUT(Q) can be attributed to the resolution
of the Allegro linear IC quiescent voltage trim, magnetic hysteresis, and thermal drift.
Electrical offset voltage (VOE): The deviation of the device output from its ideal quiescent value of VCC ⁄ 2 due to nonmagnetic causes.
Magnetic offset error (IERROM): 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 (ETOT): The accuracy represents the maximum deviation 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 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 ∆ temperature: Accuracy of sensing full-scale current flow including temperature effects.
4
ACS754050-DS, Rev. 3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Current Sensor: ACS754xCB-050
Output voltage vs. current, illustrating sensor accuracy at 0 A and at full-scale current
Increasing VOUT (V)
Accuracy
Over ∆Temperature
Accuracy
25°C Only
Average
VOUT
Accuracy
Over ∆Temperature
Accuracy
25°C Only
–IP (A)
50 A
–50 A
+IP (A)
Full Scale
0A
Accuracy
25°C Only
Accuracy
Over ∆Temperature
Decreasing VOUT (V)
5
ACS754050-DS, Rev. 3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Current Sensor: ACS754xCB-050
Typical Percentage Error versus Ambient Temperature
6
4
ETOT (% of 50 A)
2
0
–2
–4
–6
+ 3 Sigma
Mean
– 3 Sigma
–8
–10
-40
-20
0
25
55
70
85
125
150
TA (°C)
6
ACS754050-DS, Rev. 3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Current Sensor: ACS754xCB-050
Definitions of Dynamic Response Characteristics
Propagation delay (tPROP): The time required for the sensor output to reflect a change in the primary current
signal. Propagation delay is attributed to inductive loading within the linear IC package, as well as in the inductive loop formed by the primary conductor geometry. Propagation delay can be considered as a fixed time offset
and may be compensated.
I (%)
Primary Current
90
Transducer Output
0
Propagation Time, tPROP
t
Response time (tRESPONSE): The time interval between a) when the primary current signal reaches 90% of its
final value, and b) when the sensor reaches 90% of its output corresponding to the applied current.
I (%)
Primary Current
90
Transducer Output
0
Response Time, tRESPONSE
t
Rise time (tr): The time interval between a) when the sensor reaches 10% of its full scale value, and b) when
it reaches 90% of its full scale value. The rise time to a step response is used to derive the bandwidth of the
current sensor, in which ƒ(–3 dB) = 0.35 / tr. Both tr and tRESPONSE are detrimentally affected by eddy current
losses observed in the conductive IC ground plane and, to varying degrees, in the ferrous flux concentrator
within the current sensor package.
I (%)
Primary Current
90
Transducer Output
10
0
Rise Time, tr
t
7
ACS754050-DS, Rev. 3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Current Sensor: ACS754xCB-050
Standards and Physical Specifications
Parameter
Specification
Flammability (package molding compound)
UL recognized to UL 94V-0
Fire and Electric Shock
UL60950-1:2003
EN60950-1:2001
CAN/CSA C22.2 No. 60950-1:2003
Creepage distance, current terminals to sensor pins
7.25 mm
Clearance distance, current terminals to sensor pins
7.25 mm
Package mass
4.63 g typical
Step Response, IP = 0 to 50 A, no external filter
ACS754 Output (mV)
Applied Step (A)
8
ACS754050-DS, Rev. 3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Current Sensor: ACS754xCB-050
Device Branding Key (Two alternative styles are used)
ACS
Allegro Current Sensor
754
Device family number
Operating ambient temperature range code [L or S]
T
ACS754
CB
Package type designator
TCB050
050
Maximum measurable current
YYWWA
Manufacturing date code: Calendar year (last two digits)
YY
Manufacturing date code: Calendar week
WW
Manufacturing date code: Shift code
A
ACS
Allegro Current Sensor
754
Device family number
Operating ambient temperature range code [L or S]
T
ACS754
CB
Package type designator
TCB050
L...L
050
Maximum measurable current
YYWW
Manufacturing lot code
L...L
YY
Manufacturing date code: Calendar year (last two digits)
WW
Manufacturing date code: Calendar week
9
ACS754050-DS, Rev. 3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Current Sensor: ACS754xCB-050
Package CB-PFF
10
ACS754050-DS, Rev. 3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Current Sensor: ACS754xCB-050
Package CB-PSF
Package CB-PSS
The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889;
5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to
permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that
the information being relied upon is current.
Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its
use; nor for any infringement of patents or other rights of third parties which may result from its use.
Copyright © 2004, 2005, AllegroMicrosystems, Inc.
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ACS754050-DS, Rev. 3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000