Data Sheet

Hall Effect Linear Current Sensor with Overcurrent
Fault Output for < 100 V Isolation Applications
ACS711
12
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Definitions of Dynamic Response Characteristics
Primary Current
Transducer Output
90
10
0
I (%)
Rise Time, t
r
t
Rise time (t
r
).Thetimeintervalbetweena)whenthesensor
reaches10%ofitsfullscalevalue,andb)whenitreaches90%
ofitsfullscalevalue.Therisetimetoastepresponseisusedto
derivethebandwidthofthecurrentsensor,inwhichƒ(–3dB)=
0.35/t
r
.Botht
r
andt
RESPONSE
aredetrimentallyaffectedbyeddy
currentlossesobservedintheconductiveICgroundplane.
Power-On Time (t
PO
). Whenthesupplyisrampedtoitsoperat-
ingvoltage,thedevicerequiresafinitetimetopoweritsinternal
componentsbeforerespondingtoaninputmagneticfield.
Power-OnTime,t
PO
,isdefinedasthetimeittakesfortheoutput
voltagetosettlewithin±10%ofitssteadystatevalueunderan
appliedmagneticfield,afterthepowersupplyhasreachedits
minimumspecifiedoperatingvoltage,V
CC
(min),asshowninthe
chartatright.