ACS714
Automotive Grade, Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor
Features and Benefits
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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
A
= 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
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
Operating temperature range, –40°C to 150°C
TÜV America
Certificate Number:
U8V 06 05 54214 010
Description
The Allegro
®
ACS714 provides economical and precise
solutions for AC or 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, switch-mode power supplies, and
overcurrent fault protection.
The device consists of a precise, low-offset, linear Hall 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 the Hall IC converts 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 sampling. The internal resistance of
this conductive path is 1.2 mΩ typical, providing low power
loss. The thickness of the copper conductor allows survival of
the device at up to 5× overcurrent conditions. The terminals of
Continued on the next page…
Package: 8 pin SOIC (suffix LC)
Approximate Scale 1:1
Typical Application
+5 V
1
2
I
P
3
4
IP+
VCC
8
7
V
OUT
C
BYP
0.1 μF
IP+ VIOUT
ACS714
IP– FILTER
IP–
GND
6
5
C
F
1 nF
Application 1. The ACS714 outputs an analog signal, V
OUT
.
that varies linearly with the uni- or bi-directional AC or DC
primary sampled current, I
P
, within the range specified. C
F
is recommended for noise management, with values that
depend on the application.
ACS714-DS, Rev. 9
SANKEN [ SANKEN ELECTRIC ]
