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ACS711
Hall Effect Linear Current Sensor with Overcurrent
Fault Output for < 100 V Isolation Applications
Definitions of Dynamic Response Characteristics
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.
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 ?(–3 dB) =
I (%)
90
Primary Current
0.35 / t r . Both t r and t RESPONSE are detrimentally affected by eddy
current losses observed in the conductive IC ground plane.
10
0
Transducer Output
Rise Time, t r
Allegro MicroSystems, LLC
115 Northeast Cutoff
t
12
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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