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PDF ACS725 Data sheet ( Hoja de datos )
| Número de pieza | ACS725 | |
| Descripción | Galvanically Isolated Current Sensor IC | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ACS725 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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ACS725
Automotive Grade, Galvanically Isolated Current Sensor IC
With Common Mode Field Rejection in a Small Footprint SOIC8 Package
FEATURES AND BENEFITS
• Differential Hall sensing rejects common mode fields
• 1.2 mΩ primary conductor resistance for low power loss
and high inrush current withstand capability
• Integrated shield virtually eliminates capacitive coupling
from current conductor to die, greatly suppressing output
noise due to high dv/dt transients
• Industry-leading noise performance with greatly
improved bandwidth through proprietary amplifier and
filter design techniques
• High bandwidth 120KHz analog output for faster
response times in control applications.
• Filter pin allows user to filter the output for improved
resolution at lower bandwidth.
• Patented integrated digital temperature compensation
circuitry allows for near closed loop accuracy over
temperature in an open loop sensor
• Small footprint, low-profile SOIC8 package suitable for
space-constrained applications
• Filter pin simplifies bandwidth limiting for better
resolution at lower frequencies
Continued on the next page…
Package: 8-Pin SOIC (suffix LC)
Tytpeested
TÜV America
Certificate Number:
U8V 14 11 54214 032
CB 14 11 54214 031
CB Certificate Number:
US-22334-A2-UL
Approximate Scale 1:1
DESCRIPTION
The Allegro™ ACS725 current sensor IC is an economical and
precise solution for AC or DC current sensing in industrial,
automotive, commercial, and communications systems. The
small package is ideal for space constrained applications
while also saving costs due to reduced board area. 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. The current is sensed differentially in order to reject
common mode fields, improving accuracy in magnetically
noisy environments. The inherent device accuracy is optimized
through the close proximity of the magnetic field 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 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 terminals of the conductive path are electrically isolated
from the sensor leads (pins 5 through 8). This allows the
ACS725 current sensor IC to be used in high-side current sense
applications without the use of high-side differential amplifiers
or other costly isolation techniques.
Continued on the next page…
ACS725-DS
1
IP+
VCC 8
+IP ACS725
2
IP+
7
VIOUT
IP
3
IP–
–IP
FILTER 6
4
IP–
GND 5
CF
1 nF
CLOAD
CBYPASS
0.1 µF
The ACS725 outputs an
analog signal, VIOUT , that
changes, proportionally,
with the bidirectional AC
or DC primary sensed
current, IP , within the
specified measurement
range. The FILTER pin
can be used to decrease
the bandwidth in order
to optimize the noise
performance.
Typical Application
1 page  
ACS725
Automotive Grade, Galvanically Isolated Current Sensor IC
With Common Mode Field Rejection in a Small Footprint SOIC8 Package
COMMON ELECTRICAL CHARACTERISTICS1: valid through the full range of TA , VCC = 3.3 V, CF = 0, unless other-
wise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max. Unit
Supply Voltage
Supply Current
Output Capacitance Load
Output Resistive Load
Primary Conductor Resistance
Internal Filter Resistance2
Primary Hall Coupling Factor
Secondary Hall Coupling Factor
Hall plate Sensitivity Matching
Rise Time
Propagation Delay
Response Time
Bandwidth
Noise Density
Noise
Nonlinearity
Sensitivity Ratiometry Coefficient
VCC
ICC
CL
RL
RIP
RF(int)
G1
G2
Sensmatch
tr
tpd
tRESPONSE
BW
IND
IN
ELIN
SENS_RAT_
COEF
VCC = 3.3 V, output open
VIOUT to GND
VIOUT to GND
TA = 25°C
TA = 25ºC
TA = 25ºC
TA = 25ºC
IP = IP(max), TA = 25°C, CL = 1 nF
IP = IP(max), TA = 25°C, CL = 1 nF
IP = IP(max), TA = 25°C, CL = 1 nF
Small signal –3 dB; CL = 1 nF
Input referenced noise density;
TA = 25°C, CL = 1 nF
Input referenced noise: CF = 4.7 nF,
CL = 1 nF, BW = 18 kHz, TA = 25°C
Through full range of IP
Vcc = 3.0 to 3.6 V, TA = 25ºC
3
–
–
4.7
–
–
–
–
–
–
–
–
–
–
–
–1.5
–
3.3 3.6 V
10 14 mA
– 10 nF
– – kΩ
1.2 – mΩ
1.8 – kΩ
11 – G/A
2.8 – G/A
±1 – %
3 – μs
2 – μs
4 – μs
120 – kHz
200
–
µA(rms)/
√Hz
27 – mA(rms)
– +1.5 %
1.3 – –
Zero Current Output Ratiometry Coefficient
QVO_RAT_
COEF
Vcc = 3.0 to 3.6 V, TA = 25ºC
– 1 ––
Saturation Voltage3
VOH RL = 4.7 kΩ
VOL RL = 4.7 kΩ
–
VCC – 0.3
–
V
– 0.3 – V
Power-On Time
tPO
Output reaches 90% of steady-state
level, TA = 25°C, IP = IPR(max) applied
–
80 – μs
Shorted Output to Ground Current
Isc(gnd)
TA = 25ºC
– 3.3 – mA
Shorted Output to VCC Current
Isc(vcc)
TA = 25ºC
– 45 – mA
1Device may be operated at higher primary current levels, IP , ambient temperatures, TA , and internal leadframe temperatures, provided the Maximum Junction Tempera-
ture, TJ(max), is not exceeded.
2RF(int) forms an RC circuit via the FILTER pin.
3The sensor IC will continue to respond to current beyond the range of IP until the high or low saturation voltage; however, the nonlinearity in this region will be worse than
through the rest of the measurement range.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
ACS725
Automotive Grade, Galvanically Isolated Current Sensor IC
With Common Mode Field Rejection in a Small Footprint SOIC8 Package
xLLCTR-40AB
Zero Current Output Voltage vs. Temperature
1656
Offset Voltage vs. Temperature
6
1654
4
1652
2
1650
0
1648
1646
1644
-50
33
33
33
33
33
32
32
32
32
32
31
-50
1.00
0.80
0.60
0.40
0.20
0.00
-0.20
-0.40
-0.60
-0.80
-1.00
-50
0 50 100
Temperature (ºC)
Sensitivity vs. Temperature
0 50 100
Temperature (ºC)
Nonlinearity vs. Temperature
0 50 100
Temperature (ºC)
150
150
150
-2
-4
-6
-50
2
0 50 100
Temperature (ºC)
Sensitivity Error vs. Temperature
1
0
-1
-2
-3
-4
-5
-50
0 50 100
Temperature (ºC)
Total Error at IPR(max) vs. Temperature
2
1
0
-1
-2
-3
-4
-5
-50
0 50 100
Temperature (ºC)
150
150
150
+3 Sigma
Average
-3 Sigma
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet ACS725.PDF ] | |
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