ACS715 Allegro MicroSystems, Inc., ACS715 Datasheet

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ACS715

Manufacturer Part Number
ACS715
Description
Acs715 Automotive Grade, Fully Integrated, Hall Effect-based Linear Current Sensor With 2.1 Kvrms Voltage Isolation And A Low-resistance Current Conductor
Manufacturer
Allegro MicroSystems, Inc.
Datasheet

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Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor
Features and Benefits
▪ Low-noise analog signal path
▪ Device bandwidth is set via the FILTER pin
▪ 5 μs output rise time in response to step input current
▪ 80 kHz bandwidth
▪ Total output error 1.5% typical at T
▪ Small footprint, low-profile SOIC8 package
▪ 1.2 mΩ internal conductor resistance
▪ 2.1 kV
▪ 5.0 V, single supply operation
▪ 133 to 185 mV/A output sensitivity
▪ Output voltage proportional to DC currents
▪ Factory-trimmed for accuracy
▪ Extremely stable output offset voltage
▪ Nearly zero magnetic hysteresis
▪ Ratiometric output from supply voltage
▪ Operating temperature range, –40°C to 150°C
Package: 8 Lead SOIC (suffix LC)
ACS715-DS
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Approximate Scale 1:1
RMS
minimum isolation voltage from pins 1-4 to pins 5-8
A
Application 1. The ACS715 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.
= 25°C
P
, within the range specified. C
Typical Application
I
P
1
2
3
4
IP+
IP+
IP–
IP–
ACS715
FILTER
VIOUT
GND
VCC
8
7
6
5
Description
The Allegro
solutions for DC current sensing in automotive systems. The
device package allows for easy implementation by the customer.
Typical applications include motor control, load detection and
management, switched-mode power supplies, and overcurrent
fault protection.
The device consists of a precise, low-offset, linear Hall
sensor circuit with a copper conduction path located near the
surface of 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 after packaging.
The output of the device has a positive slope (>V
when an increasing current flows through the primary copper
conduction path (from pins 1 and 2, to pins 3 and 4), which
is the path used for current sensing. The internal resistance of
this conductive path is 1.2 mΩ typical, providing low power
loss. The thickness of the copper conductor allows survival
Continued on the next page…
V
F
C
OUT
F
is recommended for
+5 V
C
0.1 μF
®
BYP
ACS715 provides economical and precise
OUT
.
ACS715
IOUT(Q)
)

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ACS715 Summary of contents

Page 1

... Ratiometric output from supply voltage ▪ Operating temperature range, –40°C to 150°C Package: 8 Lead SOIC (suffix LC) Approximate Scale 1:1 Application 1. The ACS715 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 terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS715 current sensor to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. ...

Page 3

... Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor ACS715 with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor VCC (Pin 8) Hall Current Drive IP+ Sense Temperature (Pin 1) IP+ (Pin 2) IP– (Pin 3) IP– (Pin 4) Terminal List Table Number 1 and 2 3 and 4 ...

Page 4

... Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor ACS715 with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor COMMON OPERATING CHARACTERISTICS Characteristic Symbol ELECTRICAL CHARACTERISTICS Supply Voltage V CC Supply Current I CC Output Capacitance Load C LOAD Output Resistive Load R LOAD Primary Conductor Resistance ...

Page 5

... Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor ACS715 with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor x20A PERFORMANCE CHARACTERISTICS over Range E: T Characteristic Symbol Optimized Accuracy Range I P Sensitivity Sens Noise V NOISE(PP) Zero Current Output Slope ∆I OUT(Q) Sensitivity Slope ∆ ...

Page 6

... Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor ACS715 with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor x30A PERFORMANCE CHARACTERISTICS over Range E: T Characteristic Symbol Optimized Accuracy Range I P Sensitivity Sens Noise V NOISE(PP) Zero Current Output Slope ∆I OUT(Q) Sensitivity Slope ∆ ...

Page 7

... Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor ACS715 with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Mean Supply Current versus Ambient Temperature 10.5 10.4 10.3 10 10.1 10.0 9.9 9.8 9.7 9.6 -50 - (°C) A Magnetic Offset versus Ambient Temperature 0 –0.5 –1.0 –1.5 –2.0 –2 ...

Page 8

... Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor ACS715 with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor Mean Supply Current versus Ambient Temperature 10.1 10.0 9.9 90 9.7 9.6 9.5 9.4 -50 - (°C) A Magnetic Offset versus Ambient Temperature 0 –0.5 –1.0 –1.5 –2.0 –2 ...

Page 9

... Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor ACS715 with 2.1 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) ...

Page 10

... Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor ACS715 with 2.1 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. ...

Page 11

... GND + BYP 0.1 μ VCC IP LMC6772 VIOUT IP+ V – ACS715 REF FILTER IP– 4 IP– 5 GND Q3 2N7002 Q2 FDS6675a R2 100 kΩ LOAD Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ...

Page 12

... ACS715 device is ideal for use in high-accuracy applications that cannot afford the signal attenuation associated with the use of an external RC low-pass filter Pin 3 Pin 4 VCC IP– ...

Page 13

... SEATING PLANE 1.75 MAX 1.27 0. ACS715T RLCPPP L...L YYWW For the latest version of this document our website at: www.allegromicro.com 4º 0.21 0.84 0.25 SEATING PLANE GAUGE PLANE All dimensions nominal, not for tooling use (reference JEDEC MS-012 AA) Dimensions in millimeters A Terminal #1 mark area ...

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