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ACS715 Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer ACS715
Beschreibung Hall Effect-Based Linear Current Sensor
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 13 Seiten
ACS715 Datasheet, Funktion
ACS715
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
www.daFtaeshaeteut4rue.csomand 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 TA= 25°C
Small footprint, low-profile SOIC8 package
1.2 mΩ internal conductor resistance
2.1 kVRMS minimum isolation voltage from pins 1-4 to pins 5-8
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)
Approximate Scale 1:1
Description
The Allegro® ACS715 provides economical and precise
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 (>VIOUT(Q))
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…
Typical Application
ACS715-DS
1 IP+
8
VCC
2 IP+
7
VIOUT
IP ACS715
3 IP– FILTER 6
4 IP– GND 5
+5 V
VOUT
CBYP
0.1 μF
CF
Application 1. The ACS715 outputs an analog signal, VOUT.
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.






ACS715 Datasheet, Funktion
ACS715
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
wwxw3.d0aAtasPhEeeRt4FuO.coRmMANCE CHARACTERISTICS over Range E: TA = –40°C to 85°C1, CF = 1 nF, and VCC = 5 V, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min. Typ. Max. Units
Optimized Accuracy Range
IP
0 – 30 A
Sensitivity
Sens Over full range of IP, IP applied for 5ms; TA = 25°C
129 133 137 mV/A
Noise
VNOISE(PP)
Peak-to-peak, TA = 25°C, 2 kHz external filter, 133 mV/A pro-
grammed Sensitivity, CF = 47 nF, COUT = 10 nF, 2 kHz bandwidth
15
mV
Zero Current Output Slope
IOUT(Q)
TA = –40°C to 25°C
TA = 25°C to 150°C
– 0.06 – mV/°C
– 0.1 – mV/°C
Sensitivity Slope
Sens
TA = –40°C to 25°C
TA = 25°C to 150°C
– 0.007 – mV/A/°C
– –0.025 – mV/A/°C
Electrical Offset Voltage
VOE IP = 0 A
–30 –
30 mV
Total Output Error2
ETOT IP = 30 A, IP applied for 5 ms; TA = 25°C
– ±1.5 –
%
1Device may be operated at higher primary current levels, IP, and ambient temperatures, TA, provided that the Maximum Junction Temperature,
TJ(max), is not exceeded.
2Percentage of IP, with IP = 30 A. Output filtered.
x30A PERFORMANCE CHARACTERISTICS over Range L: TA = –40°C to 150°C1, CF = 1 nF, and VCC = 5 V, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min. Typ. Max. Units
Optimized Accuracy Range
IP
0 – 30 A
Sensitivity
Sens
Over full range of IP, IP applied for 5ms; TA = 25°C
Over full range of IP, TA = –40°C to 150°C
– 133 – mV/A
125 – 137 mV/A
Noise
VNOISE(PP)
Peak-to-peak, TA = 25°C, 2 kHz external filter, 133 mV/A pro-
grammed Sensitivity, CF = 47 nF, COUT = 10 nF, 2 kHz bandwidth
15
mV
Zero Current Output Slope
IOUT(Q)
TA = –40°C to 25°C
TA = 25°C to 150°C
– 0.06 – mV/°C
– 0.1 – mV/°C
Sensitivity Slope
Sens
TA = –40°C to 25°C
TA = 25°C to 150°C
– 0.007 – mV/A/°C
– –0.025 – mV/A/°C
Electrical Offset Voltage
VOE IP = 0 A
–40 –
40 mV
Total Output Error2
ETOT
IP = 30 A, IP applied for 5 ms; TA = 25°C
IP = 30 A, IP applied for 5 ms; TA = –40° to 150°C
– ±1.5
–5 –
5
%
%
1Device may be operated at higher primary current levels, IP, and ambient temperatures, TA, provided that the Maximum Junction Temperature,
TJ(max), is not exceeded.
2Percentage of IP, with IP = 30 A. Output filtered.
Allegro MicroSystems, Inc.
6
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

6 Page









ACS715 pdf, datenblatt
ACS715
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Improving Sensing System Accuracy Using the FILTER Pin
www.datasheet4u.com
In low-frequency sensing applications, it is often advantageous to
add a simple RC filter to the output of the sensor. Such a low-
pass filter improves the signal-to-noise ratio, and therefore the
resolution, of the sensor output signal. However, the addition of
an RC filter to the output of a sensor IC can result in undesirable
sensor output attenuation — even for dc signals.
Signal attenuation, VATT , is a result of the resistive divider
effect between the resistance of the external filter, RF (see Appli-
cation 5), and the input impedance and resistance of the customer
interface circuit, RINTFC. The transfer function of this resistive
divider is given by:
VATT
=
VIOUT
⎜⎜⎝⎛
RINTFC
RF + RINTFC
⎟⎠
.
Even if RF and RINTFC are designed to match, the two individual
resistance values will most likely drift by different amounts over
temperature. Therefore, signal attenuation will vary as a function
of temperature. Note that, in many cases, the input impedance,
RINTFC , of a typical analog-to-digital converter (ADC) can be as
low as 10 kΩ.
The ACS715 contains an internal resistor, a FILTER pin connec-
tion to the printed circuit board, and an internal buffer ampli-
fier. With this circuit architecture, users can implement a simple
RC filter via the addition of a capacitor, CF (see Application 6)
from the FILTER pin to ground. The buffer amplifier inside of
the ACS715 (located after the internal resistor and FILTER pin
connection) eliminates the attenuation caused by the resistive
divider effect described in the equation for VATT. Therefore, the
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.
Application 5. When a low pass filter is construct-
ed externally to a standard Hall effect device,
a resistive divider may exist between the filter
resistor, RF, and the resistance of the custom-
er interface circuit, RINTFC. This resistive divider
will cause excessive attenuation, as given by the
transfer function for VATT.
+5 V
Pin 3 Pin 4
IP– IP–
0.1 MF
VCC
Pin 8
Allegro ACS706
Voltage
Regulator
To all subcircuits
Amp
Out
Gain
Temperature
Coefficient
Trim Control
Offset
VIOUT
Pin 7
N.C. RF
Pin 6
Resistive Divider
Input
Application
Interface
Circuit
Low Pass Filter
CF RINTFC
Application 6. Using the FILTER pin
provided on the ACS715 eliminates
the attenuation effects of the resis-
tor divider between RF and RINTFC,
shown in Application 5.
+5 V
IP+ IP+
Pin 1 Pin 2
VCC
Pin 8
GND
Pin 5
IP+
Pin 1
IP+
Pin 2
Hall Current
Drive
IP–
Pin 3
IP–
Pin 4
Sense Temperature
Coefficient Trim
Sense
Trim
Signal
Recovery
0 Ampere
Offset Adjust
GND
Pin 5
Allegro ACS715
Buffer Amplifier
and Resistor
FILTER
Pin 6
CF
VIOUT
Pin 7
Input
Application
Interface
Circuit
RINTFC
Allegro MicroSystems, Inc.
12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

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