ACS772
High Accuracy, Hall-Effect-Based, 200 kHz Bandwidth,
Galvanically Isolated Current Sensor IC with 100 µΩ Current Conductor
DESCRIPTION
FEATURES AND BENEFITS
• AEC-Q100 Grade 1 qualified
The Allegro™ ACS772 family of current sensor ICs provide
economicalandprecisesolutionsforACorDCcurrentsensing,
idealformotorcontrol,loaddetectionandmanagement,power
supply and DC-to-DC converter control, and inverter control.
The 2.5 µs response time enables overcurrent fault detection
in safety-critical applications.
• Typical of 2.5 μs output response time
• 5 V supply operation
• Ultra-low power loss: 100 μΩ internal conductor resistance
• Reinforced galvanic isolation allows use in economical,
high-side current sensing in high-voltage systems
• 4800 Vrms dielectric strength certified under UL60950-1
• Industry-leading noise performance with greatly
improved bandwidth through proprietary amplifier and
filter design techniques
• Integrated shield greatly reduces capacitive coupling
from current conductor to die due to high dV/dt signals,
and prevents offset drift in high-side, high-voltage
applications
• Greatly improved total output error through digitally
programmed and compensated gain and offset over the
full operating temperature range
• Small package size, with easy mounting capability
• Monolithic Hall IC for high reliability
• Output voltage proportional to AC or DC currents
• Factory-trimmed for accuracy
The device consists of a precision, low-offset linear Hall
circuit with a copper conduction path located near the die.
Applied current flowing through this copper conduction path
generates a magnetic field which the Hall IC converts into a
proportionalvoltage.Deviceaccuracyisoptimizedthroughthe
close proximity of the magnetic signal to the Hall transducer.
A precise, proportional output voltage is provided by the
low-offset, chopper-stabilized BiCMOS Hall IC, which is
programmed for accuracy at the factory. Proprietary digital
temperature compensation technology greatly improves the
IC accuracy and temperature stability.
High-level immunity to current conductor dV/dt and stray
electricfieldsisofferedbyAllegroproprietaryintegratedshield
technology for low output voltage ripple and low offset drift
in high-side, high-voltage applications.
• Extremely stable output offset voltage
The output of the device increases when an increasing current
flows through the primary copper conduction path (from
terminal 4 to terminal 5), which is the path used for current
sampling. The internal resistance of this conductive path is
100 μΩ typical, providing low power loss.
CB Certificate Number:
US-29755-UL
PACKAGE: 5-pin package (suffix CB)
The thickness of the copper conductor allows survival of the
device at high overcurrent conditions. The terminals of the
conductive path are electrically isolated from the signal leads
(pins1through3).ThisallowstheACS772familyofsensorICs
to be used in applications requiring electrical isolation without
the use of opto-isolators or other costly isolation techniques.
PFF
PSF
PSS
Leadform
Leadform
Leadform
Continued on the next page…
Not to scale
5 ꢀ
1
5
4
ꢀCC
ꢂP–
ꢂPꢃ
CBꢁP
0.1 µF
Application 1: the ACS772 outputs an analog
signal, VOUT, that varies linearly with the
bidirectional AC or DC primary sensed cur-
rent, IP, within the range specified. RF and
CF are for optimal noise management, with
values that depend on the application.
ACS772
2
3
ꢂP
GꢄD
CF
ꢀꢂOUT
ꢀOUT
RF
Typical Application
ACS772-DS, Rev. 8
MCO-0000363
March 14, 2019
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