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ACS780XLR Datasheet(PDF) 22 Page - Allegro MicroSystems

Part No. ACS780XLR
Description  Core-less, micro-sized, 100 A continuous current package
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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ACS780XLR Datasheet(HTML) 22 Page - Allegro MicroSystems

 
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High-Precision Linear Hall-Effect-Based
Current Sensor IC With 200 µΩ Current Conductor
ACS780xLR
22
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Figure 4: ACS780 Current Trace Approach – the desired
range of the angle θ is from 0° to 85°
ENCROACHMENT UNDER THE IC
In the LR package, the encroachment of the current-carrying
trace under the device actually changes the path of the current
flowing through the IP bus. This can cause a change in the cou-
pling factor of the IP bus to the IC and can significantly reduce
deviceperformance.UsingANSYSMaxwellElectromagnetic
Suites, the current density and magnetic field generated from the
currentflowweresimulated.InFigure5,thereareresultsfrom
two different simulations. The first is the case where the current
trace leading up to the IP bus terminates at the desired point. The
second case is where the current trace encroaches far up the IP
bus. The red arrows in both simulations represent the areas of
high current density. In the simulation with no excess overlap, the
red areas, and hence the current density, are very different from
the simulation with the excess overlap. It was also observed that
the field on H1 was larger when there was no excess overlap.
This can be observed by the darker shade of blue.
Figure 5: Simulations of ACS780 Leadframe with Differ-
ent Overlap of the Current Trace and the IP Bus


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