ACS756 Allegro MicroSystems, Inc., ACS756 Datasheet

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ACS756

Manufacturer Part Number
ACS756
Description
Acs756 Fully Integrated, Hall Effect-based Linear Current Sensor With 3 Kvrms Voltage Isolation And A Low-resistance Current Conductor
Manufacturer
Allegro MicroSystems, Inc.
Datasheet

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ACS756KCA-050B
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ACS756SCA-050B-PFF-T
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Features and Benefits
▪ Industry-leading noise performance through proprietary
▪ Total output error 0.8% at T
▪ Small package size, with easy mounting capability
▪ Monolithic Hall IC for high reliability
▪ Ultra-low power loss: 130 μΩ internal conductor resistance
▪ 3 kV
▪ 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
Package: 5 pin module (suffix PFF)
ACS756-DS
amplifier and filter design techniques
pins 1-3 to pins 4-5
with 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Additional leadforms available for qualifying volumes
RMS
minimum isolation voltage from
1
A
Fully Integrated, Hall Effect-Based Linear Current Sensor
= 25°C
Application 1. The ACS756 outputs an analog signal, V
varies linearly with the uni- or bi-directional AC or DC primary
sensed current, I
noise management, with values that depend on the application.
I
P
4
5
Typical Application
IP+
IP–
ACS756
P
, within the range specified. C
VIOUT
GND
VCC
1
2
3
Description
The Allegro ACS756 family of current sensors 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 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 has a positive slope (>V
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 130 μΩ typical, providing low power loss.
Continued on the next page…
Engineering samples available on a limited basis. Contact your local
sales or applications support office for additional information.
R
F
C
F
C
0.1 μF
BYP
F
+5 V
is for optimal
V
OUT
OUT
, that
ACS756
CC
/ 2) when an

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ACS756 Summary of contents

Page 1

... Nearly zero magnetic hysteresis Package: 5 pin module (suffix PFF) 1 Additional leadforms available for qualifying volumes Application 1. The ACS756 outputs an analog signal, V varies linearly with the uni- or bi-directional primary sensed current, I noise management, with values that depend on the application. ACS756-DS ...

Page 2

... The thickness of the copper conductor allows survival of the device 5× overcurrent conditions. The terminals of the conductive path are electrically isolated from the sensor leads (pins 1 through 3). This allows the ACS756 family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. ...

Page 3

... ACS756 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor IP+ IP– Terminal List Table Number Fully Integrated, Hall Effect-Based Linear Current Sensor with Functional Block Diagram VCC To all subcircuits Amp Temperature Gain Coefficient Trim Control GND Pin-out Diagram IP VIOUT ...

Page 4

... ACS756 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor COMMON OPERATING CHARACTERISTICS Characteristic Symbol Supply Voltage V Supply Current I CC Power On Time t PO Rise Time t Internal Bandwidth 2 BW Output Load Resistance R LOAD(MIN) Output Load Capacitance C LOAD(MAX) Primary Conductor Resistance R PRIMARY Symmetry E SYM Bidirectional 0 A Output ...

Page 5

... ACS756 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor X050 PERFORMANCE CHARACTERISTICS over Range K Characteristic Symbol Primary Sensed Current I P Sens TA Sensitivity Sens TOP Noise 2 V NOISE E LIN(HT) Nonlinearity E LIN(LT) V OE(TA) Electrical Offset Voltage 3 V OE(TOP)HT V OE(TOP)LT E TOT(HT) Total Output Error 4 E TOT(LT) ...

Page 6

... ACS756 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor X100 PERFORMANCE CHARACTERISTICS over Range S Characteristic Symbol Primary Sensed Current I P Sens TA Sensitivity Sens TOP Noise 2 V NOISE E LIN(HT) Nonlinearity E LIN(LT) V OE(TA) 3 Electrical Offset Voltage V OE(TOP)HT V OE(TOP)LT E TOT(HT) 4 Total Output Error E TOT(LT) 1 Device may be operated at higher primary current levels (max), is not exceeded ...

Page 7

... ACS756 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Definitions of Accuracy Characteristics Sensitivity (Sens). The change in sensor output in response change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity ( 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 half-scale current of the device ...

Page 8

... ACS756 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Definitions of Dynamic Response Characteristics Power-On Time (t ). When the supply is ramped to its operat- PO ing voltage, the device requires a finite time to power its internal components before responding to an input magnetic field. Power-On Time defined as the time it takes for the output PO voltage to settle within ± ...

Page 9

... ACS756 3 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Chopper Stabilization Technique Chopper Stabilization is an innovative circuit technique that is used to minimize the offset voltage of a Hall element and an asso- ciated on-chip amplifier. Allegro patented a Chopper Stabiliza- tion technique that nearly eliminates Hall IC output drift induced by temperature or package stress effects ...

Page 10

... All dimensions nominal, not for tooling use 7.00 Dimensions in millimeters Exact configuration at supplier discretion within limits shown A Dambar removal intrusion 3.50 B Perimeter through-holes recommended 1.90 ACS756 RCAPPP L...L YYWW For the latest version of this document, visit our website: www.allegromicro.com 0.5 .020 R1 .039 R3 .118 0.5 .020 R2 ...

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