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ACS780XLR Datasheet(PDF) 20 Page - Allegro MicroSystems

Part No. ACS780XLR
Description  Core-less, micro-sized, 100 A continuous current package
Download  24 Pages
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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ACS780XLR Datasheet(HTML) 20 Page - Allegro MicroSystems

 
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High-Precision Linear Hall-Effect-Based
Current Sensor IC With 200 µΩ Current Conductor
ACS780xLR
20
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Chopper Stabilization Technique
Amp
Regulator
Clock/Logic
Hall Element
Tuned
Filter
Anti-Aliasing
LP Filter
Concept of Chopper Stabilization Technique
When using Hall-effect technology, a limiting factor for
switchpoint accuracy is the small signal voltage developed across
the Hall element. This voltage is disproportionally small relative
to the offset that can be produced at the output of the Hall sensor
IC. This makes it difficult to process the signal while maintaining
an accurate, reliable output over the specified operating tempera-
ture and voltage ranges.
Chopper stabilization is a unique approach used to minimize
Hall offset on the chip. Allegro employs a technique to remove
key sources of the output drift induced by thermal and mechani-
cal stresses. This offset reduction technique is based on a signal
modulation-demodulation process. The undesired offset signal is
separated from the magnetic field-induced signal in the frequency
domain, through modulation. The subsequent demodulation acts
as a modulation process for the offset, causing the magnetic field-
induced signal to recover its original spectrum at baseband, while
the DC offset becomes a high-frequency signal. The magnetic-
sourced signal then can pass through a low-pass filter, while the
modulated DC offset is suppressed.
In addition to the removal of the thermal and stress-related offset,
this novel technique also reduces the amount of thermal noise
in the Hall sensor IC while completely removing the modulated
residue resulting from the chopper operation. The chopper sta-
bilizationtechniqueusesahigh-frequencysamplingclock.For
demodulation process, a sample-and-hold technique is used. This
high-frequency operation allows a greater sampling rate, which
results in higher accuracy and faster signal-processing capability.
This approach desensitizes the chip to the effects of thermal and
mechanical stresses, and produces devices that have extremely
stable quiescent Hall output voltages and precise recoverabil-
ity after temperature cycling. This technique is made possible
throughtheuseofaBiCMOSprocess,whichallowstheuseof
low-offset, low-noise amplifiers in combination with high-density
logic integration and sample-and-hold circuits.


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