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ACS712大电流转小电压芯片
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2012-10-26
20:14:23
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ACS712可将高达20A或这30A的大电流转换为几十毫伏的电压,以供AD采样
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IP+
IP+
IP–
IP–
I
P
5
GND
2
4
1
3
ACS712
7
8
+5 V
VIOUT
V
OUT
6
FILTER
VCC
C
BYP
0.1 μF
C
F
1 nF
Application 1. The ACS712 outputs an analog signal, V
OUT
.
that varies linearly with the uni- or bi-directional AC or DC
primary sensed current, I
P
, within the range specified. C
F
is recommended for noise management, with values that
depend on the application.
ACS712
Description
The Allegro
®
ACS712 provides economical and precise
solutions for AC or DC current sensing in industrial,
commercial, and communications 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
IOUT(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
ACS712-DS, Rev. 6
Features and Benefits
▪ Low-noise analog signal path
▪ Device bandwidth is set via the new FILTER pin
▪ 5 μs output rise time in response to step input current
▪ 80 kHz bandwidth
▪ Total output error 1.5% at T
A
= 25°C
▪ Small footprint, low-profile SOIC8 package
▪ 1.2 mΩ internal conductor resistance
▪ 2.1 kV
RMS
minimum isolation voltage from pins 1-4 to pins 5-8
▪ 5.0 V, single supply operation
▪ 66 to 185 mV/A output sensitivity
▪ Output voltage proportional to AC or DC currents
▪ Factory-trimmed for accuracy
▪ Extremely stable output offset voltage
▪ Nearly zero magnetic hysteresis
▪ Ratiometric output from supply voltage
Fully Integrated, Hall Effect-Based Linear Current Sensor
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Continued on the next page…
Approximate Scale 1:1
Package: 8 Lead SOIC (suffix LC)
Typical Application
TÜV America
Certificate Number:
U8V 06 05 54214 010
Fully Integrated, Hall Effect-Based Linear Current Sensor with
2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
ACS712
2
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Supply Voltage V
CC
8V
Reverse Supply Voltage V
RCC
–0.1 V
Output Voltage V
IOUT
8V
Reverse Output Voltage V
RIOUT
–0.1 V
Reinforced Isolation Voltage V
ISO
Pins 1-4 and 5-8; 60 Hz, 1 minute, T
A
=25°C 2100 V
Voltage applied to leadframe (Ip+ pins), based
on IEC 60950
184 V
peak
Basic Isolation Voltage V
ISO(bsc)
Pins 1-4 and 5-8; 60 Hz, 1 minute, T
A
=25°C 1500 V
Voltage applied to leadframe (Ip+ pins), based
on IEC 60950
354 V
peak
Output Current Source I
IOUT(Source)
3mA
Output Current Sink I
IOUT(Sink)
10 mA
Overcurrent Transient Tolerance I
P
1 pulse, 100 ms 100 A
Nominal Operating Ambient Temperature T
A
Range E –40 to 85 ºC
Maximum Junction Temperature T
J
(max) 165 ºC
Storage Temperature T
stg
–65 to 170 ºC
Selection Guide
Part Number Packing*
T
A
(°C)
Optimized Range, I
P
(A)
Sensitivity, Sens
(Typ) (mV/A)
ACS712ELCTR-05B-T Tape and reel, 3000 pieces/reel –40 to 85 ±5 185
ACS712ELCTR-20A-T Tape and reel, 3000 pieces/reel –40 to 85 ±20 100
ACS712ELCTR-30A-T Tape and reel, 3000 pieces/reel –40 to 85 ±30 66
*Contact Allegro for additional packing options.
loss. 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 sensor leads
(pins 5 through 8). This allows the ACS712 current sensor to be
used in applications requiring electrical isolation without the use
of opto-isolators or other costly isolation techniques.
The ACS712 is provided in a small, surface mount SOIC8 package.
The leadframe is plated with 100% matte tin, which is compatible
with standard lead (Pb) free printed circuit board assembly processes.
Internally, the device is Pb-free, except for flip-chip high-temperature
Pb-based solder balls, currently exempt from RoHS. The device is
fully calibrated prior to shipment from the factory.
Description (continued)
Parameter Specification
Fire and Electric Shock
CAN/CSA-C22.2 No. 60950-1-03
UL 60950-1:2003
EN 60950-1:2001
Fully Integrated, Hall Effect-Based Linear Current Sensor with
2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
ACS712
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
VCC
(Pin 8)
(Pin 7)
VIOUT
R
F(INT)
GND
(Pin 5)
FILTER
(Pin 6)
Dynamic Offset
Cancellation
IP+
(Pin 1)
IP+
(Pin 2)
IP−
(Pin 3)
IP−
(Pin 4)
Sense
Trim
Signal
Recovery
Sense Temperature
Coefficient Trim
0 Ampere
Offset Adjust
Hall Current
Drive
+5 V
IP+
IP+
IP–
IP–
VCC
VIOUT
FILTER
GND
1
2
3
4
8
7
6
5
Terminal List Table
Number Name Description
1 and 2 IP+ Terminals for current being sensed; fused internally
3 and 4 IP– Terminals for current being sensed; fused internally
5 GND Signal ground terminal
6 FILTER Terminal for external capacitor that sets bandwidth
7 VIOUT Analog output signal
8 VCC Device power supply terminal
Functional Block Diagram
Pin-out Diagram
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