ALLEGRO ACS755xCB-050 User Manual
ACS755xCB-050
T
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
isolation voltage between terminals 4/5 and
RMS
pins 1/2/3 for up to 1 minute
▪ 18 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
Package: 5 pin module (leadform PFF)
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…
T ypical Application
+5 V
4
IP+
ACS755
I
P
5
IP–
VIOUT
Application 1. The ACS755 outputs an analog signal, V
that varies linearly with the unidirectional DC primary sensed
current, IP , within the range specified. CF is recommended for
noise management, with values that depend on the application.
VCC
GND
1
C
BYP
0.1 µF
2
C
F
3
V
OUT
OU
.
R
F
ACS755050-DS Rev. 4
ACS755xCB-050
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
Selection Guide
Part Number
ACS755LCB-050-PFF –40 to 150 50 60 18 Formed Formed
ACS755SCB-050-PFF –20 to 85 50 60 18 Formed Formed
1
Contact Allegro for additional packing options.
TOP
(°C)
Primary Sensed
Current, I
(A)
P
Sensitivity
Sens (Typ.)
(mV/A)
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.
Bandwidth
(kHz)
Package
Terminals Signal Pins
Packing
170 pieces per bulk bag
1
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Supply Voltage V
Reverse Supply Voltage V
Output Voltage V
Reverse Output Voltage V
Maximum Basic Isolation Voltage V
Maximum Rated Input Current I
Output Current Source I
Output Current Sink I
Nominal Operating Ambient Temperature T
Maximum Junction TJ(max) 165 ºC
Storage Temperature T
CC
RCC
IOUT
RIOUT
ISO
IN
OUT(Source)
OUT(Sink)
A
stg
TÜV America
Certificate Number:
U8V 04 11 54214 001
Range L –40 to 150 ºC
Range S –20 to 85 ºC
353 VAC, 500 VDC, or V
Fire and Electric Shock
EN60950-1:2001
16 V
–16 V
16 V
–0.1 V
pk
200 A
3mA
10 mA
–65 to 170 ºC
V
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
ACS755xCB-050
Fully Integrated, Hall Effect-Based Linear Current Sensor
with High Voltage Isolation and a Low-Resistance Current Conductor
Functional Block Diagram
+5 V
IP+
IP–
Dynamic Offset
GND
VCC
Voltage
Regulator
To all subcircuits
Amp Out
Cancellation
Gain
Temperature
Coefficient
Trim Control
Filter
Offset
VIOUT
0.1 μF
Pin-out Diagram
4
IP+
IP–
5
3
2
1
VIOUT
GND
VCC
Terminal List Table
Number Name Description
1 VCC Device power supply pin
2 GND Signal ground pin
3 VIOUT Analog output signal pin
4 IP+ Terminal for current being sensed
5 IP– Terminal for current being sensed
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
Loading...