ACS755xCB-100
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with High Voltage Isolation and a Low-Resistance Current Conductor
Discontinued Product
These parts are no longer in production The device should not be
purchased for new design applications. Samples are no longer available.
Date of status change: May 3, 2010
Recommended Substitutions:
For existing customer transition, and for new customers or new appli-
cations, refer to Allegro sales for alternatives.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
ACS755xCB-100
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
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
▪
27 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 sensor ICs 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
circuit with a copper conduction path located near the die.
Applied current flowing through this copper conduction path
generates a magnetic field which the Hall IC converts 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 sampling. The
internal resistance of this conductive path is 100
μΩ
typical,
providing low power loss.
Continued on the next page…
Package: 5 pin package (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 sampled
current, I
P
, within the range specified. C
F
is recommended for
noise management, with values that depend on the application.
ACS755100-DS Rev. 10
ACS755xCB-100
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
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 signal leads (pins 1 through
3). This allows the ACS755 family of sensor ICs 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-100-PFF
2
ACS755SCB-100-PFF
2
1
Contact Allegro
2
Variant
T
OP
(°C)
–40 to 150
–20 to 85
Primary
Sampled
Current, I
P
(A)
100
100
Sensitivity
Sens (Typ.)
(mV/A)
40
40
Package
Bandwidth
(kHz)
27
27
Terminals
Formed
Formed
Signal Pins
Formed
Formed
Packing
1
170 pieces per bulk bag
for additional packing options.
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 2, 2009. Deadline for receipt of LAST
TIME BUY orders is April 30, 2010.
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-100
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
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 sampled
Terminal for current being sampled
Description
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
ACS755xCB-100
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
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.
Primary Sampled Current
I
P
0
Supply Voltage
V
CC
4.5
Supply Current
I
CC
V
CC
= 5.0 V, output open
6.5
Output Resistance
R
OUT
I
OUT
= 1.2 mA
–
Output Capacitance Load
C
LOAD
VOUT to GND
–
VOUT to GND
4.7
Output Resistive Load
R
LOAD
Primary Conductor Resistance
R
PRIMARY
I
P
= +100A; T
A
= 25°C
–
Isolation Voltage
V
ISO
Pins 1-3 and 4-5; 60 Hz, 1 minute
3.0
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
–
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
36.5
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 100 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
36
Peak-to-peak, T
A
= 25°C,
Noise
V
NOISE
–
no external filter
Linearity
E
LIN
Over full range of I
P
–
I = 0 A, T
A
= 25°C
–
Zero Current Output Voltage
V
OUT(Q)
I = 0 A, T
A
= 25°C
–15
Electrical Offset Voltage
V
OE
(Magnetic error not included)
I=0A
–50
Magnetic Offset Error
I
ERROM
I = 0 A, after excursion of 100 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
–
Typ.
–
5.0
8
1
–
–
100
–
4
13
13
27
40
–
65
–
0.6
–
–
±0.1
±1
–
4
13
13
27
40
–
65
–
0.6
–
–
±0.1
±1
–
Max.
100
5.5
10
2
10
–
–
–
–
–
–
–
–
41.5
–
±2.8
–
15
25
±0.30
–
±9.0
–
–
–
–
–
42
–
±2.8
–
15
50
±0.30
–
±10.0
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
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