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PDF ACS715 Data sheet ( Hoja de datos )
| Número de pieza | ACS715 | |
| Descripción | Hall Effect-Based Linear Current Sensor | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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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.
1 page  
ACS715
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
wwxw2.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 – 20 A
Sensitivity
Sens Over full range of IP, IP applied for 5ms; TA = 25°C
178 185 190 mV/A
Noise
VNOISE(PP)
Peak-to-peak, TA = 25°C, 2 kHz external filter, 185 mV/A pro-
grammed Sensitivity, CF = 47 nF, COUT = 10 nF, 2 kHz bandwidth
–
21
–
mV
Zero Current Output Slope
∆IOUT(Q)
TA = –40°C to 25°C
TA = 25°C to 150°C
– 0.08 – mV/°C
– 0.16 – mV/°C
Sensitivity Slope
∆Sens
TA = –40°C to 25°C
TA = 25°C to 150°C
– 0.035 – mV/A/°C
– 0.019 – mV/A/°C
Electrical Offset Voltage
VOE IP = 0 A
–40 –
40 mV
Total Output Error2
ETOT IP = 20 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 = 20 A. Output filtered.
x20A 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 – 20 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
– 185 – mV/A
161 – 194 mV/A
Noise
VNOISE(PP)
Peak-to-peak, TA = 25°C, 2 kHz external filter, 185 mV/A pro-
grammed Sensitivity, CF = 47 nF, COUT = 10 nF, 2 kHz bandwidth
–
21
–
mV
Zero Current Output Slope
∆IOUT(Q)
TA = –40°C to 25°C
TA = 25°C to 150°C
– 0.08 – mV/°C
– 0.16 – mV/°C
Sensitivity Slope
∆Sens
TA = –40°C to 25°C
TA = 25°C to 150°C
– 0.035 – mV/A/°C
– 0.019 – mV/A/°C
Electrical Offset Voltage
VOE IP = 0 A
–60 –
60 mV
Total Output Error2
ETOT
IP = 20 A, IP applied for 5 ms; TA = 25°C
IP = 20 A, IP applied for 5 ms; TA = –40° to 150°C
– ±1.5
–6 –
–
6
%
%
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 = 20 A. Output filtered.
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5 Page 
ACS715
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Chopper Stabilization Technique
wwCwh.odaptpaesrheSetat4bui.lciozmation is an innovative circuit technique that is
used to minimize the offset voltage of a Hall element and an asso-
ciated on-chip amplifier. Allegro patented a Chopper Stabiliza-
tion technique that nearly eliminates Hall IC output drift induced
by temperature or package stress effects. This offset reduction
technique is based on a signal modulation-demodulation process.
Modulation is used to separate the undesired dc offset signal from
the magnetically induced signal in the frequency domain. Then,
using a low-pass filter, the modulated dc offset is suppressed
while the magnetically induced signal passes through the filter.
As a result of this chopper stabilization approach, the output
voltage from the Hall IC is desensitized to the effects of tempera-
ture and mechanical stress. This technique produces devices that
have an extremely stable Electrical Offset Voltage, are immune to
thermal stress, and have precise recoverability after temperature
cycling.
This technique is made possible through the use of a BiCMOS
process that allows the use of low-offset and low-noise amplifiers
in combination with high-density logic integration and sample
and hold circuits.
Regulator
Hall Element
Clock/Logic
Amp
Low-Pass
Filter
Concept of Chopper Stabilization Technique
Typical Applications
+5 V
+5 V
CBYP
0.1 μF
R1
33 kΩ
1 IP+
8
VCC
2 IP+
7
VIOUT
R2
100 kΩ
VOUT
RPU
100 kΩ
4
–
5
1
Fault
IP ACS715
3 IP– FILTER 6
4 IP– GND 5
CF
3 + 2 U1
LMV7235
D1
1N914
Application 2. 10 A Overcurrent Fault Latch. Fault threshold
set by R1 and R2. This circuit latches an overcurrent fault
and holds it until the 5 V rail is powered down.
VS1
CBYP
0.1 μF
R1
100 kΩ
R2
100 kΩ
1 IP+
8
VCC
2 IP+
7
VIOUT
IP ACS715
RF
1 kΩ
3 IP– FILTER 6
4 IP– GND 5
CF
0.01 μF
1+
LM321
5
4
3–
2
R3
3.3 kΩ
VOUT
C1
1000 pF
Application 3. This configuration increases gain to 610 mV/A
(tested using the ACS712ELC-05A).
+5 V
VS2
+5 V
Application 4. Control circuit for MOSFET ORing.
1 IP+
8
VCC
2 IP+
7
VIOUT
VOUT
CBYP
0.1 μF
+
IP1
ACS715
3 IP– FILTER 6
4 IP– GND 5
VREF –
CF
U1
LMC6772
Q3
2N7002
Q1
FDS6675a
R3
10 kΩ
1 IP+
8
VCC
2 IP+
7
VIOUT
VOUT
CBYP
0.1 μF
+
IP2
ACS715
3 IP– FILTER 6
4 IP– GND 5
VREF –
CF
U2
LMC6772
Q2
FDS6675a
R4
10 kΩ
Q4
2N7002
R1
100 kΩ
LOAD
R2
100 kΩ
Allegro MicroSystems, Inc.
11
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ACS715.PDF ] | |
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