ACS755-050 Allegro MicroSystems, Inc., ACS755-050 Datasheet

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ACS755-050

Manufacturer Part Number
ACS755-050
Description
Acs755 Current Sensors
Manufacturer
Allegro MicroSystems, Inc.
Datasheet
Features and Benefits
▪ Monolithic Hall IC for high reliability
▪ Single +5 V supply
▪ 3 kV
▪ 18 kHz bandwidth
▪ Automotive temperature range
▪ End-of-line factory-trimmed for gain and offset
▪ Ultra-low power loss: 100 μΩ internal conductor
▪ Ratiometric output from supply voltage
▪ Extremely stable output offset voltage
▪ Small package size, with easy mounting capability
▪ Output proportional to DC currents
Package: 5 pin module (leadform PFF)
ACS755050-DS Rev. 3
pins 1/2/3 for up to 1 minute
resistance
RMS
isolation voltage between terminals 4/5 and
with High Voltage Isolation and a Low-Resistance Current Conductor
Fully Integrated, Hall Effect-Based Linear Current Sensor
Application 1. The ACS755 outputs an analog signal, V
that varies linearly with the unidirectional DC primary sensed
current, I
noise management, with values that depend on the application.
I
P
4
5
P
, within the range specified. C
IP+
IP–
ACS755
Typical Application
VIOUT
GND
VCC
1
2
3
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…
R
F
C
F
F
is recommended for
C
0.1 µF
BYP
+5 V
OUT
ACS755xCB-050
.
V
OUT

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ACS755-050 Summary of contents

Page 1

... Small package size, with easy mounting capability ▪ Output proportional to DC currents Package: 5 pin module (leadform PFF) I Application 1. The ACS755 outputs an analog signal, V that varies linearly with the unidirectional DC primary sensed current, I noise management, with values that depend on the application. ...

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 ACS755 family of sensors to be used in applications requiring electrical isolation without the use of opto-isolators or Selection Guide ...

Page 3

... ACS755xCB-050 with High Voltage Isolation and a Low-Resistance Current Conductor IP+ IP– Terminal List Table Number Fully Integrated, Hall Effect-Based Linear Current Sensor Functional Block Diagram VCC Voltage Regulator To all subcircuits Amp Temperature Gain Coefficient Trim Control GND Pin-out Diagram ...

Page 4

... ACS755xCB-050 with High Voltage Isolation and a Low-Resistance Current Conductor ELECTRICAL CHARACTERISTICS, Characteristic Primary Sensed Current Supply Voltage Supply Current Output Resistance Output Capacitance Load Output Resistive Load Primary Conductor Resistance Isolation Voltage PERFORMANCE CHARACTERISTICS, -20°C to +85°C, V Propagation time Response time ...

Page 5

... ACS755xCB-050 with High 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 full-scale current of the device ...

Page 6

... ACS755xCB-050 with High Voltage Isolation and a Low-Resistance Current Conductor –I Definitions of Dynamic Response Characteristics Propagation delay (t ). The time required for the sensor PROP output to reflect a change in the primary current signal. Propaga- tion delay is attributed to inductive loading within the linear IC package, as well as in the inductive loop formed by the primary conductor geometry ...

Page 7

... ACS755xCB-050 with High Voltage Isolation and a Low-Resistance Current Conductor Fully Integrated, Hall Effect-Based Linear Current Sensor Step Response 50 A Excitation Signal, T =25°C A x050 Device Excitation Signal Output (mV) 7 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com ...

Page 8

... 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 ACS755 RCBPPP L...L YYWW For the latest version of this document, visit our website: www.allegromicro.com 0.5 .020 R1 .039 0.5 .020 R2 .079 B 4 ...

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