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ACS780XLR Datasheet(PDF) 18 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) 18 Page - Allegro MicroSystems

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High-Precision Linear Hall-Effect-Based
Current Sensor IC With 200 µΩ Current Conductor
ACS780xLR
18
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
FUNCTIONAL DESCRIPTION
Power-On Reset (POR) and Undervoltage
Lock-Out (UVLO) Operation
Thedescriptionsinthissectionassume:temperature=25°C,no
output load (RL, CL), and no significant magnetic field is present.
Power-Up At power-up, as VCC ramps up, the output is in a
high-impedance state. When VCC crosses VPORH (location [1]
inFigure1and[1’]inFigure2),thePORReleasecounter
starts counting for tPORR. At this point, if VCC exceeds VUVLOH
[2’],theoutputwillgotoVCC / 2 after tUVLOD=14µs[3’].If
VCC does not exceed VUVLOH [2], the output will stay in the
high-impedance state until VCC reaches VUVLOH[3]andthen
will go to VCC / 2 after tUVLOD[4].
VCC drops below VCC(min)= 4.5 V If VCC drops below
VUVLOL[4’,5],theUVLOEnableCounterstartscounting.If
VCC is still below VUVLOL when counter reaches tUVLOE, the
UVLOfunctionwillbeenabledandtheouputwillbepulled
nearGND[6].IfVCC exceeds VUVLOLbeforetheUVLO
EnableCounterreachestUVLOE[5’],theoutputwillcontinue
to be VCC/2.
Figure 2: POR and UVLO Operation – Fast Rise Time case
tUVLOE
tPORR
tPORR
tUVLOD
< tUVLOE
tUVLOD
tUVLOD
tUVLOE
1
1’ 2’
4’ 5’
6’ 7’
3’
2
5.0
VUVLOH
VUVLOH
VPORH
VPORL
VPORH
VPORL
VUVLOL
VUVLOL
2.5
High Impedance
High Impedance
High Impedance
High Impedance
Slope =
VCC /2
Slope =
VCC /2
GND
Time
Time
Time
Time
GND
VCC
VCC
VOUT
5.0
2.5
GND
GND
VOUT
3
5 6
7
11
8
10
9
4
Slope =
VCC /2
< tUVLOE
Figure 1: POR and UVLO Operation – Slow Rise Time case


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